Cross-Currency Swap 1 Cross-Currency Swap 1 [Member] Cross-Currency Swap 1 [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Short-term, separately-managed accounts (SMAs) Debt Securities, Available-for-sale, Current Other Other Intangible Assets [Member] Total Derivative instruments: Derivative Liability Other investments Equity Securities, FV-NI, Current Lease liabilities: Lease Liability [Abstract] Lease Liability [Abstract] Distribution systems Distribution Systems [Member] Distribution Systems [Member] Weighted average remaining lease term for operating leases Operating Lease, Weighted Average Remaining Lease Term Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Investment, Name [Axis] Investment, Name [Axis] PSARs and PSUs PSARs and PSUs [Member] PSARs and PSUs [Member] Net decrease in cash and cash equivalents and restricted cash Net decrease Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 2023 Long-Term Debt, Maturity, Year Two Acquisitions and related adjustments Goodwill, Purchase Accounting Adjustments Certificates of deposit Certificates of Deposit [Member] Document Fiscal Year Focus Document Fiscal Year Focus Subsequent Event Type [Domain] Subsequent Event Type [Domain] Remaining authorized for share repurchases Stock Repurchase Program, Remaining Authorized Repurchase Amount Aggregate number of shares excluded from computation of EPS (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted average discount rate, for operating leases Operating Lease, Weighted Average Discount Rate, Percent Revenue recognized Contract with Customer, Liability, Revenue Recognized Subsequent Events [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] Realized and unrealized gains due to changes in fair values of certain investments and debt, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Award Type [Domain] Award Type [Domain] Options exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Schedule of Investments [Line Items] Schedule of Investments [Line Items] Derivative instruments contributed to the VMED O2 JV in connection with the U.K. JV Transaction Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Reduction in UTB Decrease in Unrecognized Tax Benefits is Reasonably Possible Goodwill Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Univision Holdings Inc. (Univision) Univision Holdings Inc [Member] Univision Holdings Inc Accumulated earnings Retained Earnings [Member] Financing activities Proceeds from Derivative Instrument, Financing Activities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Recognition of previously unrecognized tax benefits Income Tax Reconciliation, Previously Unrecognized Tax Benefits Income Tax Reconciliation, Previously Unrecognized Tax Benefits Derivative instruments that do not involve the exchange of notional amounts at the inception and maturity Notional Amount Of Derivative Instruments Without Exchange Of Notional Amounts At Inception And Maturity Notional Amount of Derivative Instruments without Exchange of Notional Amounts at Inception and Maturity Dividends from affiliates and others Proceeds from Equity Method Investment, Distribution Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Weighted average interest rate Debt, Weighted Average Interest Rate Comprehensive earnings Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest UPC Facility AT UPC Facility AT [Member] UPC Facility AT Financing cash outflows from finance leases Finance Lease, Principal Payments Basic earnings (loss) attributable to Liberty Global shareholders per share (in USD per share) Earnings Per Share, Basic Revenue Recognition and Related Costs Revenue from Contract with Customer [Text Block] Other than options outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Document Type Document Type 2022 Long-Term Debt, Maturity, Year One Switzerland SWITZERLAND Class C Common Class C [Member] Entity Current Reporting Status Entity Current Reporting Status Aggregate assets associated with incremental costs to obtain a contract and contract fulfillment costs Capitalized Contract Cost, Net Cross-Currency Swap 6 Cross-Currency Swap 6 [Member] Cross-Currency Swap 6 [Member] Commercial paper Commercial Paper [Member] Schedule of Investments [Table] Schedule of Investments [Table] Restricted cash included in other current assets and other assets, net Restricted Cash and Cash Equivalents 2022 Unrecorded Unconditional Purchase Obligation, to be Paid, Year One Plume Design, Inc. (Plume) Plume Design, Inc. (Plume) [Member] Plume Design, Inc. (Plume) Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Belgium BELGIUM Current maturities of debt and finance lease obligations Long-term Debt and Lease Obligation, Current Plan Name [Axis] Plan Name [Axis] Total carrying amount of debt Long-term Debt Quoted prices in active markets for identical assets (Level 1) Fair Value, Inputs, Level 1 [Member] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Operating leases Lessee, Operating Lease, Liability, Payment, Due [Abstract] Additional paid-in capital Additional Paid in Capital LIABILITIES AND EQUITY Liabilities and Equity [Abstract] UTB that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Investment Income [Table] Investment Income [Table] Interest Rate Swap Interest Rate Swap [Member] Current Derivative Liability, Current ITV Collar Loan ITV Collar Loan [Member] ITV 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AU and AY Leases Lessee, Finance Leases [Text Block] Trading Symbol Trading Symbol Damages sought Loss Contingency, Damages Sought, Value Total subscription revenue Cable Subscription [Member] Cable Subscription [Member] U.K. (a) UNITED KINGDOM Entity Address, Country Entity Address, Country Current liabilities: Liabilities, Current [Abstract] Options exercisable, weighted average exercise price or base price (in dollars per shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Tax benefit associated with technology innovation Effective Income Tax Rate Reconciliation, Technology Innovation, Amount Effective Income Tax Rate Reconciliation, Technology Innovation, Amount VodafoneZiggo JV Receivable II VodafoneZiggo JV Receivable II [Member] VodafoneZiggo JV Receivable II Derivative Instrument [Axis] Derivative Instrument [Axis] Central and Eastern Europe Central and Eastern Europe Central and Eastern Europe [Member] Central and Eastern Europe [Member] Operating leases Present value of lease payments Operating Lease, Liability Telenet Senior Secured Notes Telenet Senior Secured Notes [Member] Telenet Senior Secured Notes [Member] Common stock Common Stock, Value, Issued Weighted average discount rate, for finance leases Finance Lease, Weighted Average Discount Rate, Percent Measurement Input, Weighted Average Cost Of Capital Measurement Input, Weighted Average Cost Of Capital [Member] Measurement Input, Weighted Average Cost Of Capital Total liabilities Disposal Group, Including Discontinued Operation, Liabilities UPC Holding UPC Holding UPC Holding [Member] UPC Holding [Member] Leverage ratio Equity Method Investment, Leverage Ratio Equity Method Investment, Leverage Ratio UPC Holding Bank Facility UPC Holding Bank Facility [Member] UPC Holding Bank Facility [Member] Leases Lessee, Operating Leases [Text Block] Depreciation and amortization Finance Lease, Right-of-Use Asset, Amortization 2021 (remainder of year) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Ownership [Axis] Ownership [Axis] Incremental shares attributable to the assumed exercise of outstanding options and SARs and the release of RSUs and PSUs upon vesting (treasury stock method) (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Geographic Segments Revenue from External Customers by Geographic Areas [Table Text Block] Class of Stock [Axis] Class of Stock [Axis] Capital expenditures, net Payments to Acquire Productive Assets Thereafter Finance Lease, Liability, to be Paid, after Year Five Realized and unrealized gains on derivative instruments, net Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Interest Rate Collars Interest Rate Collar [Member] Interest Rate Collar SG&A expense Selling, General and Administrative Expenses [Member] Revenue (notes 3, 4, 5 and 16) Revenue from Contract with Customer, Excluding Assessed Tax Consolidation Items [Domain] Consolidation Items [Domain] Equity [Abstract] Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Percent of annual incentive compensation receivable in shares Shareholder Inventive Program, Percent of Annual Incentive Compensation Shareholder Inventive Program, Percent of Annual Incentive Compensation Measurement Input Type [Domain] Measurement Input Type [Domain] ITV ITV - Subject to Re-Use Rights [Member] ITV - Subject to Re-Use Rights [Member] Non-subscription revenue Business to Business Non-Subscription [Member] Business to Business Non-Subscription [Member] Variable Rate [Axis] Variable Rate [Axis] Intangible assets subject to amortization, net (note 8) Other Intangible Assets, Net Segment Reporting Segment Reporting Disclosure [Text Block] Weighted average remaining lease term for finance leases Finance Lease, Weighted Average Remaining Lease Term Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Total debt and finance lease obligations Long-term Debt and Lease Obligation, Including Current Maturities Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Other, including intersegment eliminations Geography Eliminations [Member] Assets held for sale (note 4) Assets Held-for-sale, Not Part of Disposal Group Property, Plant and Equipment [Abstract] Variable Rate [Domain] Variable Rate [Domain] Additional paid-in capital Additional Paid-in Capital [Member] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Total Unrecorded Unconditional Purchase Obligation Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Accrued interest Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss Basis and other differences in the treatment of items associated with investments in subsidiaries and affiliates Effective Income Tax Rate Reconciliation, Decrease in Basis and Other Differences in the Treatment of Items Associated with Investments in Subsidiaries and Affiliates, Amount Effective Income Tax Rate Reconciliation, Decrease in Basis and Other Differences in the Treatment of Items Associated with Investments in Subsidiaries and Affiliates, Amount Lions Gate Entertainment Corp (Lionsgate) Lionsgate [Member] Lionsgate [Member] Other income, net Other income, net Other Nonoperating Income (Expense) Estimated fair value Long-term Debt, Fair Value Number of borrowing groups Number of Borrowing Groups Number of Borrowing Groups Property and Equipment Additions of our Reportable Segments Schedule of Reporting Capital 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[Axis] Customer premises equipment Customer Premises Equipment [Member] Customer Premises Equipment [Member] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Other Other Unnamed Investment [Member] Other Unnamed Investment [Member] Other investments Long-term Investments, Fair Value Long-term Investments, Fair Value Total Liberty Global shareholders Stockholders' Equity Attributable to Parent Non-subscription revenue Mobile Non-Subscription [Member] Mobile Non-Subscription [Member] Payables and accruals Increase (Decrease) in Accounts Payable and Accrued Liabilities Ireland IRELAND Percentage of amounts recovered Percentage of Amounts Recovered Percentage of Amounts Recovered Repurchases of Liberty Global ordinary shares Payments for Repurchase of Common Stock Changes in operating assets and liabilities, net of the effects of acquisitions and dispositions Increase (Decrease) in Operating Capital Share price (in dollars per share) Business Acquisition, Share Price Liberty Global shareholders: Stockholders' Equity Attributable to Parent [Abstract] UPC Revolving Facility UPC Revolving Facility [Member] UPC Revolving Facility [Member] Due in one to five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Long-term operating lease liabilities (note 10) Noncurrent portion Operating Lease, Liability, Noncurrent Total payments Finance Lease, Liability, Payment, Due Outstanding principal amount Debt Instrument, Face Amount Debt Instrument, Face Amount Asset Derivative Asset [Abstract] Poland POLAND Operating Segments Operating Segments [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] RSUs Restricted Stock Units (RSUs) [Member] Total cash outflows from operating and finance leases Operating and Finance Lease, Payments Operating and Finance Lease, Payments Telefonica Telefonica [Member] Telefonica Finance lease obligations (note 10) Finance lease Present value of lease payments Finance Lease, Liability Support equipment, buildings and land Support Equipment, Buildings and Land [Member] Support Equipment, Buildings and Land [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Assets: Disposal Group, Including Discontinued Operation, Assets [Abstract] Virgin Media Virgin Media [Member] Virgin Media [Member] Related party note receivable rate Receivable with Imputed Interest, Effective Yield (Interest Rate) Equity Equity Method Investments Cash and cash equivalents and restricted cash: Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Condensed Consolidated Statement of Operations Income Statement [Abstract] Percent of reduction in monthly wholesale cable resale access prices Percent Of Reduction In Monthly Wholesale Cable 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Facility AU [Member] UPC Facility AU Total current assets Assets, Current Floor rate Derivative, Exchange Rate Floor Total payments Lessee, Operating Lease, Liability, to be Paid Interest accrued Increase (Decrease) in Accrued Interest Receivable, Net Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Change in valuation allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount UK JV Services UK JV Services [Member] UK JV Services Repurchases by Telenet of its outstanding shares Stock Repurchased During Period, Value Condensed Consolidated Balance Sheet Statement of Financial Position [Abstract] Telenet Credit Facility Telenet Credit Facility [Member] Telenet Credit Facility [Member] Impact of derivative instruments on borrowing costs Impact of Derivative Instruments on Borrowing Costs, Percent Increase (Decrease) Impact of Derivative Instruments on Borrowing Costs, Percent Increase (Decrease) Current portion Long-term Debt, Current Maturities Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Schedule of Weighted Average Number of Shares Schedule of Weighted Average Number of Shares [Table Text Block] Entity Small Business Entity Small Business Equity Component [Domain] Equity Component [Domain] Adjustments due to changes in subsidiaries’ equity and other, net Stockholders' Equity, Other 2022 Lessee, Operating Lease, Liability, to be Paid, Year One Disposal Group Name [Domain] Disposal Group Name [Domain] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Litigation Case [Axis] Litigation Case [Axis] Total property and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization 2026 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five Long-term, SMAs Debt Securities, Available-for-sale, Noncurrent Cash received from the sale of investments Proceeds from Sale, Maturity and Collection of Investments Counterparty Name [Domain] Counterparty Name [Domain] 2025 Lessee, Operating Lease, Liability, to be Paid, Year Four Weighted Average Weighted Average [Member] Realized and unrealized gains (losses) due to changes in fair values of certain investments and debt, net (notes 5, 7 and 9) Realized and unrealized losses (gains) due to changes in fair values of certain investments and debt, net Realized and unrealized losses (gains) due to changes in fair values of certain investments and debt, net Realized And Unrealized Gains (Losses) Due To Changes In Fair Values of Certain Investments and Debt, Net Realized And Unrealized Gains (Losses) Due To Changes In Fair Values of Certain Investments and Debt, Net Current portion Finance Lease, Liability, Current Earnings (loss) before income taxes Loss before income taxes Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Significant other observable inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Gain (loss) on derivative instruments, net Realized and unrealized losses (gains) gains on derivative instruments, net Derivative, Gain (Loss) on Derivative, Net Amortized cost basis Debt Securities, Available-for-sale, Amortized Cost Interest expense Finance Lease, Interest Expense Schedule of Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Impairment, restructuring and other operating items, net Impairment, restructuring and other operating items, net Restructuring, Settlement and Impairment Provisions Finance leases Finance Lease, Liability, Payment, Due [Abstract] Non-performance based incentive awards (b) Non-Performance Based Share-Based Awards [Member] Non-Performance Based Share-Based Awards [Member] Investment, Name [Domain] Investment, Name [Domain] Percent of share-based compensation include in income (loss) Percent Of Share-Based Compensation Expense Included In Income (Loss) From Equity Method Investments Percent Of Share-Based Compensation Expense Included In Income (Loss) From Equity Method Investments Title of Individual [Axis] Title of Individual [Axis] Product and Service [Domain] Product and Service [Domain] SARs Stock Appreciation Rights (SARs) [Member] Slovakia SLOVAKIA Value added tax, vendor financing arrangement Value Added Tax, Vendor Financing Arrangement Value Added Tax, Vendor Financing Arrangement Cash paid for amounts included in the measurement of lease liabilities: Cash Flow, Lessee [Abstract] Cash Flow, Lessee [Abstract] Interest rate Debt Instrument, Interest Rate, Stated Percentage CANAL+ Polska S.A. CANAL+ Polska S.A. [Member] CANAL+ Polska S.A. Non-cash borrowings and repayments Non-Cash Borrowings and Repayments of Debt Non-Cash Borrowings and Repayments of Debt Schedule of Realized and Unrealized Losses on Derivative Instruments Schedule Of Realized And Unrealized Gains Losses On Derivative Instruments Text Block Schedule Of Realized And Unrealized Gains Losses On Derivative Instruments. 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Telenet Revolving Credit Facility I Telenet Revolving Credit Facility I [Member] Telenet Revolving Credit Facility I [Member] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Acquisitions and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Subsequent Event Subsequent Events [Text Block] Unused borrowing capacity Debt Instrument, Unused Borrowing Capacity, Amount Net cash used by financing activities Net Cash Provided by (Used in) Financing Activities Treasury shares, at cost Treasury Stock, Value Total residential cable revenue Cable [Member] Cable [Member] Pension-related adjustments and other Other Comprehensive Income Defined Benefit Plans Adjustment And Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease Other Comprehensive Income Defined Benefit Plans Adjustment And Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease Share of results of affiliates, net (note 5) Share of results of affiliates, net Share of results of affiliates, net Income (Loss) from Equity Method Investments Cross-Currency Swap 7 Cross-Currency Swap 7 [Member] Cross-Currency Swap 7 [Member] Other operating (note 13) Other Cost and Expense, Operating Maturities of Financing Lease Liabilities Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Entities [Table] Entities [Table] Notional amount due to counterparty Notional amount Due To Counterparty [Member] Due To Counterparty [Member] Video Cable Video Subscription [Member] Cable Video Subscription [Member] Belgium Regulatory Developments Belgium Regulatory Developments [Member] Belgium Regulatory Developments [Member] VodafoneZiggo JV Loan VodafoneZiggo JV Loan [Member] VodafoneZiggo JV Loan [Member] Assessed period Share-Based Compensation Arrangement By Share-Based Payment Award, Assessed Period Share-Based Compensation Arrangement By Share-Based Payment Award, Assessed Period Derivative [Table] Derivative [Table] Third-Party Purchaser Third-Party Purchaser [Member] Third-Party Purchaser [Member] Cross-Currency Swap 4 Cross-Currency Swap 4 [Member] Cross-Currency Swap 4 [Member] Total residential mobile revenue Mobile Residential [Member] Mobile Residential [Member] Consolidated Entities [Domain] Consolidated Entities [Domain] Unused commitments percentage Debt Instrument, Unused Commitments Percentage Debt Instrument, Unused Commitments Percentage 2025 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four Schedule of PP&E Property, Plant and Equipment [Table Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Total investments Investments, Fair Value Disclosure Property and equipment, net (notes 8 and 10) Property, Plant and Equipment, Net 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Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating costs and expenses (exclusive of depreciation and amortization, shown separately below): Costs and Expenses [Abstract] Noncash vendor financing arrangement, cash increase, excluding value added tax Property Plant And Equipment, Additions, Vendor Financing Arrangement Property Plant And Equipment, Additions, Vendor Financing Arrangement Equity-related derivative instruments Equity-Related Derivative Instruments [Member] Equity-Related Derivative Instruments [Member] Realized and unrealized gains (losses) Realized And Unrealized Gains (Losses) Due To Changes In Fair Values Of Certain Investments Realized And Unrealized Gains (Losses) Due To Changes In Fair Values of Certain Investments Total ROU assets Lease Asset Lease Asset Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Other long-term liabilities Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent Document Fiscal Period Focus Document Fiscal Period Focus Other debt securities Other Debt Obligations [Member] Telefonica Telefónica [Member] Telefónica Current portion of debt and finance lease obligations (notes 9 and 10) Debt, Current Unrecorded Unconditional Purchase Obligation [Line Items] Unrecorded Unconditional Purchase Obligation [Line Items] Fair value of the 2021 Ventures Incentive Plan Awards Share-Based Compensation Plan, Fair Value Disclosure Share-Based Compensation Plan, Fair Value Disclosure Counterparty Name [Axis] Counterparty Name [Axis] Cross-Currency Swap 3 Cross-Currency Swap 3 [Member] Cross-Currency Swap 3 [Member] Leases [Abstract] Leases [Abstract] Total property and equipment additions Property, Plant and Equipment, Additions LIBOR London Interbank Offered Rate (LIBOR) [Member] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Reclassification adjustment included in net earnings (loss) (note 4) Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Lacework Inc. (Lacework) Lacework Inc. (Lacework) [Member] Lacework Inc. (Lacework) Revenue Recognition and Related Costs Revenue from Contract with Customer [Policy Text Block] Weighted average common shares (diluted EPS computation) (in shares) Weighted Average Number of Shares Outstanding, Diluted Ireland Revolving Facility VM Ireland Revolving Facility [Member] VM Ireland Revolving Facility Income Taxes Income Tax Disclosure [Text Block] Liabilities associated with assets held for sale (note 4) Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Related Party [Domain] Related Party [Domain] Schedule of Stock Option Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Remainder of 2021 Unrecorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Class of Stock [Line Items] Class of Stock [Line Items] Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Unrecorded Purchase Obligation Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] Amount of claim Bankruptcy Claims, Amount of Claims Settled 2031 UPC Senior Secured Notes 2031 UPC Senior Secured Notes [Member] 2031 UPC Senior Secured Notes Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Cross-Currency Swap 2 Cross-Currency Swap 2 [Member] Cross-Currency Swap 2 [Member] Operating activities Payments for (Proceeds from) Derivative Instrument, Operating Activities Payments for (Proceeds from) Derivative Instrument, Operating Activities VodafoneZiggo JV Receivable I VodafoneZiggo JV Receivable I [Member] VodafoneZiggo JV Receivable I Total current liabilities Liabilities, Current VodafoneZiggo JV VodafoneZiggo JV VodafoneZiggo JV [Member] VodafoneZiggo JV [Member] Intersegment eliminations Intersegment Eliminations [Member] Assets acquired under finance leases Lease Obligation Incurred Foreign currency forward and option contracts Foreign currency forward and option contracts Foreign Exchange Forward [Member] Floor rate Debt Instrument, Floor Interest Rate Debt Instrument, Floor Interest Rate Loss Contingencies [Table] Loss Contingencies [Table] Revenue Revenue from Contract with Customer, Including Assessed Tax Entity Address, Postal Zip Code Entity Address, Postal Zip Code Deferred financing costs, discounts and premiums, net Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net SMAs Separately Managed Accounts (SMAs) [Member] Separately Managed Accounts (SMAs) [Member] 2021 (remainder of year) Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Title of 12(b) Security Title of 12(b) Security Statement [Table] Statement [Table] Accounting Changes and Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statistical Measurement [Axis] Statistical Measurement [Axis] Central and Corporate Central and Corporate [Member] Central and Corporate [Member] Subsequent Event Subsequent Event [Member] Cover [Abstract] Cover [Abstract] UPC Facility AY UPC Facility AY [Member] UPC Facility AY Noncurrent portion Finance Lease, Liability, Noncurrent Net carrying amount Finite-Lived Intangible Assets, Net Goodwill (note 8) Goodwill beginning balance Goodwill ending balance Goodwill Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest UPC Facility AZ UPC Facility AZ [Member] UPC Facility AZ Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Ireland Facility B1 VM Ireland Facility B1 [Member] VM Ireland Facility B1 Schedule of Changes in Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Adjustments to reconcile net earnings to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] U.K. U.K. [Member] U.K. / Ireland [Member] Schedule of Fair Values of Derivative Instrument Assets and Liabilities Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Operating lease expense Operating Lease, Cost Investments Investment Holdings [Text Block] Interkabel Acquisition Interkabel Acquisition [Member] Interkabel Acquisition [Member] Net Investment Income [Line Items] Net Investment Income [Line Items] VMED O2 JV VMED O2 JV [Member] VMED O2 JV Deferred income tax expense Deferred Income Tax Expense (Benefit) Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net earnings (loss) attributable to Liberty Global shareholders Net Income (Loss) Attributable to Parent Entity Emerging Growth Company Entity Emerging Growth Company Operating leases Operating Lease, Right-of-Use Asset Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation [Table] Income Statement Location [Axis] Income Statement Location [Axis] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Maturities of Debt and Capital Lease Obligations Schedule of Maturities of Long-term Debt [Table Text Block] VM Ireland Ireland VM Ireland [Member] VM Ireland UPC Facility AQ and AZ UPC Facility AQ and AZ [Member] UPC Facility AQ and AZ Country Region Country Region Cumulative foreign currency translation loss Translation Adjustment Functional to Reporting Currency, Net of Tax Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Total debt maturities Long-term Debt, Gross Contractual Maturities Long-term Debt, Gross Contractual Maturities Entity Filer Category Entity Filer Category Non-subscription revenue Cable Non-Subscription [Member] Cable Non-Subscription [Member] Purchase commitments Purchase Commitments [Member] Purchase Commitments [Member] Skillz Inc. (Skillz) Skillz [Member] Skillz Other assets, net (notes 3, 4, 6, 8 and 10) Other Assets, Noncurrent Long-term investments at fair value Equity Securities, FV-NI and without Readily Determinable Fair Value Total debt Long-term Debt Contractual Maturities Long-term Debt Contractual Maturities Segments [Axis] Segments [Axis] Adjusted EBITDA Income (loss) from continuing operations before income taxes Sum of operating profit and nonoperating income (expense) before income taxes. Share-based compensation (note 13) APIC, Share-based Payment Arrangement, Increase for Cost Recognition Schedule of Debt Securities Debt Securities, Available-for-sale [Table Text Block] 2021 (remainder of year) Long-Term Debt, Maturity, Remainder of Fiscal Year JV Services JV Services [Member] JV Services [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Variable lease expense Variable Lease, Cost Long-term debt and finance lease obligations (notes 9 and 10) Long-term debt and finance lease obligations Long-term Debt and Lease Obligation Long-term debt and finance lease obligations Disposal Group, Including Discontinued Operation, Debt and Capital Lease Obligations, Noncurrent Disposal Group, Including Discontinued Operation, Debt and Capital Lease Obligations, Noncurrent Government bonds Municipal Bonds [Member] Title of Individual [Domain] Title of Individual [Domain] Property and equipment gross Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Other revenue Other Category [Member] Other Category [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Credit Facility [Domain] Credit Facility [Domain] ASSETS Assets [Abstract] 2024 Long-Term Debt, Maturity, Year Three ROU assets associated with finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Net earnings (loss) attributable to Liberty Global shareholders Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax Options outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Entity Address, City or Town Entity Address, City or Town Debt Instrument [Axis] Debt Instrument [Axis] Schedule of Reconciliation of the Beginning and Ending Balances of Assets and Liabilities Measured at Fair Value Using Significant Unobservable, or Level 3, Inputs Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Changes in current liabilities related to capital expenditures Increase Decrease in Current Liabilities Related to Capital Expenditures Increase Decrease in Current Liabilities Related to Capital Expenditures Related Party [Axis] Related Party [Axis] Repurchases and cancellations of Liberty Global ordinary shares Stock Repurchased and Retired During Period, Value Addition to ROU assets associated with operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability UPC Facility AQ UPC Facility AQ [Member] UPC Facility AQ Pro Forma Information for Significant Acquisitions Business Acquisition, Pro Forma Information [Table Text Block] Telenet Overdraft Facility Telenet Overdraft Facility [Member] Telenet Overdraft Facility [Member] Liberty Global Liberty Global [Member] Liberty Global Vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Entity Interactive Data Current Entity Interactive Data Current UPC Holding Senior Notes UPC Holding Senior Notes Debt [Member] UPC Holding Senior Notes Debt [Member] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three Broadband internet Cable Broadband Internet Subscription [Member] Cable Broadband Internet Subscription [Member] Details of end of period cash and cash equivalents and restricted cash: Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations [Abstract] Non-taxable gain associated with the U.K. JV Transaction Non-Taxable Gain Associated With Subsidiaries Non-Taxable Gain Associated With Subsidiaries 2026 Long-Term Debt, Maturity, Year Five Due from related party Due from Related Parties Payments for debt redemption premium Payments For Debt Redemption Premium Payments For Debt Redemption Premium Operating cash outflows from operating leases Operating Lease, Payments All3Media Group (All3Media) All3Media [Member] All3Media [Member] Other operating expense Other Operating Income (Expense) [Member] Consideration transferred Business Combination, Consideration Transferred Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Total debt before deferred financing costs, discounts and premiums Borrowings outstanding Total vendor financing maturities Long-term Debt, Gross Goodwill [Roll Forward] Goodwill [Roll Forward] Finance leases Finance Lease, Right-of-Use Asset, after Accumulated Amortization Derivative instruments (note 6) Derivative Instruments and Hedges, Liabilities Total assets Assets, Fair Value Disclosure Document Transition Report Document Transition Report Basic earnings (loss) (attributable to Liberty Global shareholders per share (in dollars per share) Business Acquisition, Pro Forma Income (Loss) From Continuing Operations, Net Of Tax, Basic Business Acquisition, Pro Forma Income (Loss) From Continuing Operations, Net Of Tax, Basic Total liabilities and equity Liabilities and Equity Other accrued and current liabilities (note 10) Other Accrued Liabilities, Current Deferred revenue (note 3) Contract with Customer, Liability, Current 2026 Lessee, Operating Lease, Liability, to be Paid, Year Five Belgium Belgium Segment [Member] Belgium Segment [Member] Total capital expenditures, net Payments for Capital Improvements Other commitments Other Commitments [Member] Other Commitments [Member] Due in five to ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Noncontrolling interests Other Noncontrolling Interests Derivative [Line Items] Derivative [Line Items] Telenet Revolving Facility Telenet Revolving Facility [Member] Telenet Revolving Facility [Member] Earnings or Loss per Share Earnings Per Share [Text Block] Aggregate purchase price Treasury Stock, Value, Acquired, Cost Method Total assets Disposal Group, Including Discontinued Operation, Assets Average price paid per share (in dollars per share) Treasury Stock Acquired, Average Cost Per Share Ownership percentage Equity Method Investment, Ownership Percentage Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Minimum Minimum [Member] Total B2B revenue Business to Business [Member] Business to Business [Member] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Effect of exchange rate changes on cash and cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Selling, general and administrative (SG&A) (note 13) Selling, General and Administrative Expense Total finance lease expense Finance Lease, Cost Finance Lease, Cost Fair Value, Assets and Liabilities (Net) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Interest acquired Business Acquisition, Percentage of Voting Interests Acquired ITV Collar ITV Collar [Member] ITV Collar [Member] Long-lived Assets Long Lived Assets Disclosure [Text Block] The entire disclosure for long-lived assets. Cross-currency, interest rate and foreign currency derivative contracts Cross-Currency and Interest Rate Derivative Contracts [Member] Cross-Currency and Interest Rate Derivative Contracts [Member] 2025 Long-Term Debt, Maturity, Year Four Debt Debt Disclosure [Text Block] Subscription revenue Business to Business Subscription [Member] Business to Business Subscription [Member] Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Share-based Compensation Share-based Payment Arrangement [Text Block] Significant unobservable inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Leases Lessee, Leases [Policy Text Block] Excess of carrying amount over proportional share in investees net assets Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Accumulated depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Held by former Liberty Global employees Former Employees [Member] Former Employees [Member] Schedule of Investments by Accounting Method Schedule of Investments by Accounting Method [Table Text Block] Schedule of Investments by Accounting Method [Table Text Block] Cash paid for investments Payments to Acquire Interest in Subsidiaries and Affiliates Revenue by Major Category Revenue from External Customers by Products and Services [Table Text Block] Foreign currency transaction gains (losses), net Foreign currency transaction losses (gains), net Foreign currency transaction losses (gains), net Foreign Currency Transaction Gain (Loss), before Tax Non-deductible or non-taxable foreign currency exchange results Effective Income Tax Rate Reconciliation, Foreign Currency Translation, Amount Effective Income Tax Rate Reconciliation, Foreign Currency Translation, Amount Non-operating income (expense) Nonoperating Income (Expense) Percent of remaining results of operations included in investment Percent of Remaining Results of Operations Included in Income (Loss) from Equity Method Investments Percent of Remaining Results of Operations Included in Income (Loss) from Equity Method Investments PSUs Performance Shares [Member] Commitments and contingencies (notes 6, 9, 11 and 15) Commitments and Contingencies Subsequent Event [Table] Subsequent Event [Table] Accumulated other comprehensive earnings, net of taxes Accumulated Other Comprehensive Income (Loss), Net of Tax Trade receivables, allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Assets acquired under capital-related vendor financing arrangements Assets Acquired Under Capital-Related Vendor Financing Arrangements Assets Acquired Under Capital-Related Vendor Financing Arrangements Total Proceeds (Repayments) From Derivatives, Continuing Operations Proceeds (Repayments) From Derivatives, Continuing Operations Disposal Group Classification [Axis] Disposal Group Classification [Axis] Document Period End Date Document Period End Date Operating costs and expenses Costs and Expenses Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Entity Registrant Name Entity Registrant Name Less: present value discount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Stock Options, SARs and RSUs Stock Options, SARs and RSUs [Member] Stock Options, SARs and RSUs [Member] Percentage ownership in subsidiary Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions 2024 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Three Financial Instrument [Axis] Financial Instrument [Axis] Debt and Lease Obligation [Abstract] Debt and Lease Obligation [Abstract] Investing activities Payments for Derivative Instrument, Investing Activities Losses on debt extinguishment, net (note 9) Losses on debt extinguishment, net Gains (Losses) on Restructuring of Debt Less: present value discount Finance Lease, Liability, Undiscounted Excess Amount Weighted average remaining life Derivative, Average Remaining Maturity 2026 Finance Lease, Liability, to be Paid, Year Five Ordinary shares Common Stock [Member] Operating income Operating Income (Loss) Lease Balances Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Current portion Operating Lease, Liability, Current Share-based compensation expense Share-based Payment Arrangement, Noncash Expense Long-term Debt Long-term Debt [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Treasury shares, at cost Treasury Stock [Member] Realized and unrealized gains (losses) on derivative instruments, net (note 6) Realized and unrealized gains on derivative instruments, net Gain (Loss) on Derivative Instruments, Net, Pretax Principal Transaction Revenue [Table] Principal Transaction Revenue [Table] Other (d) Other Share-Based Incentive Awards [Member] Other Share-Based Incentive Awards [Member] Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Notional amount of derivative Derivative, Notional Amount Enacted tax law and rate changes Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Asserted claims Discontinued Operations, Asserted Claims Discontinued Operations, Asserted Claims Acquisitions and Dispositions [Abstract] Acquisitions and Dispositions [Abstract] Acquisitions and Dispositions [Abstract] Entity Information [Line Items] Entity Information [Line Items] Property and equipment, net Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent VMED O2 JV U.K. J.V. [Member] U.K. J.V. [Member] Total liabilities Liabilities Total residential revenue Residential [Member] Residential [Member] Performance-based incentive awards Performance-Based Incentive Awards [Member] Performance-Based Incentive Awards [Member] Consolidation Items [Axis] Consolidation Items [Axis] Measurement Input Type [Axis] Measurement Input Type [Axis] Payment of financing costs and debt premiums Payment Of Deferred Financing Costs Debt Premiums And Exchange Offer Consideration Payment Of Deferred Financing Costs Debt Premiums And Exchange Offer Consideration Common stock, issued (in shares) Common Stock, Shares, Issued VMED O2 JV (U.K.) VMED O2 JV (U.K.) [Member] VMED O2 JV (U.K.) Current assets Disposal Group, Including Discontinued Operation, Other Assets, Current Cash and restricted cash contributed to the VMED O2 JV in connection with the U.K. JV Transaction Payments For Deconsolidation Of Interest In Joint Venture Payments For Deconsolidation Of Interest In Joint Venture Business Operations, Poland Business Operations, Poland [Member] Business Operations, Poland Losses on debt extinguishment, net Gain (Loss) on Extinguishment of Debt Related party note receivable Receivable with Imputed Interest, Face Amount Percentage of shares tendered Business Acquisition, Shares Tendered, Percentage Business Acquisition, Shares Tendered, Percentage Switzerland Switzerland Segment [Member] Switzerland Segment [Member] Long-term Derivative Asset, Noncurrent 2021 Ventures Incentive Plan 2021 Ventures Incentive Plan [Member] 2021 Ventures Incentive Plan Interest expense Interest expense Interest Expense 2022 Finance Lease, Liability, to be Paid, Year One Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Percentage of legal and other third party, fees Percentage of Legal and Other Third Party, Fees Percentage of Legal and Other Third Party, Fees Amortization related to contract costs Capitalized Contract Cost, Amortization City Area Code City Area Code Accumulated earnings Retained Earnings (Accumulated Deficit) Litigation Case [Domain] Litigation Case [Domain] Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Equity Method Investments Equity Method Investments [Table Text Block] Cross-currency and interest rate derivative contracts Cross Currency Interest Rate Contract [Member] Amendment Flag Amendment Flag Net cash received related to derivative instruments Proceeds from Hedge, Financing Activities EdgeConneX EdgeConneX [Member] EdgeConneX Foreign currency translation adjustments and other, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Liabilities: Disposal Group, Including Discontinued Operation, Liabilities [Abstract] Accounting Changes Accounting Standards Update and Change in Accounting Principle [Text Block] Short-term investments Short-term Investments 2023 Finance Lease, Liability, to be Paid, Year Two Other Other Subsidiaries [Member] Relating to Other Subsidiaries not otherwise identified. Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Total equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Borrowings of debt Proceeds from Issuance of Long-term Debt Equity Components [Axis] Equity Components [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Investments Investments [Member] UPCB Finance VII Euro Notes UPCB Finance VII Euro Notes [Member] UPCB Finance VII Euro Notes Revenue and Operating Cash Flow by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Entity File Number Entity File Number Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Reclassification of liability to held for sale Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements International rate differences Effective Income Tax Rate Reconciliation, Decrease in Foreign Income Tax Rate Differential, Amount Effective Income Tax Rate Reconciliation, Decrease in Foreign Income Tax Rate Differential, Amount Held by Liberty Global employees: Employees [Member] Employees [Member] Product and Service [Axis] Product and Service [Axis] Short-term lease expense Short-term Lease, Cost Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Stock repurchased (in shares) Stock Repurchased During Period, Shares U.K. J.V. Entities U.K. J.V. Entities [Member] U.K. J.V. Entities Share-based compensation expense Share-based Payment Arrangement, Plan Modification, Incremental Cost Investments [Abstract] Investments [Abstract] Total lease liabilities Lease, Liability Lease, Liability Gain on U.K. JV Transaction (note 4) Gain on U.K. JV Transaction Other Nonoperating Gains (Losses) UPC Revolving Facility One UPC Revolving Facility One [Member] UPC Revolving Facility One Statement [Line Items] Statement [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Total investments (g) Investments Current portion of debt and finance lease obligations Disposal Group, Including Discontinued Operation, Debt and Capital Lease Obligations, Current Disposal Group, Including Discontinued Operation, Debt and Capital Lease Obligations, Current Performance obligation period Revenue, Performance Obligation, Description of Timing Fair value Fair value SMAs Debt Securities, Available-for-sale Debt Disclosure [Abstract] Debt Disclosure [Abstract] Issued at par percentage Debt Instrument, Issuance Price Percentage Debt Instrument, Issuance Price Percentage Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Corporate, Non-Segment Corporate, Non-Segment [Member] Entity [Domain] Entity [Domain] Entity Shell Company Entity Shell Company Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Local Phone Number Local Phone Number Summary of Stock-Based Compensation Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Telenet Telenet Telenet [Member] Telenet [Member] Aggregate Variable and Fixed Rate Indebtedness Aggregate Variable and Fixed Rate Indebtedness [Member] Aggregate Variable And Fixed Rate Indebtedness [Member] ROU assets recorded during the period associated with: Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract] Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract] Weighted average life Debt Securities, Available-for-sale, Term Total assets Assets Plan Name [Domain] Plan Name [Domain] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Geographical [Domain] Geographical [Domain] Liberty Global Parent Company [Member] Co-venturer ownership percentage Equity Method Investment, Co-Venturer Ownership Percentage Equity Method Investment, Co-Venturer Ownership Percentage Non-controlling interests Noncontrolling Interest [Member] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Derivative Contract [Domain] Derivative Contract [Domain] Minimum repurchase percentage Share Repurchase Program, Minimum Repurchase Requirement, Percentage Share Repurchase Program, Minimum Repurchase Requirement, Percentage Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Schedule of Debt Schedule of Debt [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Entity Tax Identification Number Entity Tax Identification Number Subsequent Event [Line Items] Subsequent Event [Line Items] Programming costs Programming and Copyright Costs Programming and Copyright Costs Weighted average ordinary shares outstanding (basic EPS computation) (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted earnings (loss) attributable to Liberty Global shareholders per share (in USD per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Amortization of deferred financing costs and non-cash interest Amortization of Debt Issuance Costs and Discounts 2023 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Two Net cash paid for taxes Income Taxes Paid, Net Non-deductible or non-taxable interest and other items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Comprehensive earnings (loss) attributable to Liberty Global shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Notional amount due from counterparty Notional amount Due From Counterparty [Member] Due From Counterparty [Member] Deferred revenue Contract with Customer, Liability Other comprehensive earnings (loss), net of taxes: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other accrued and current liabilities Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities, Current Long-term Derivative Liability, Noncurrent Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Corporate debt securities Corporate Debt Securities [Member] Income Tax Benefit (Expense) Reconciliation Table Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Accounts payable Accounts Payable, Current Total Liberty Global shareholders Parent [Member] Summary of Assets and Liabilities Measured at Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Accumulated other comprehensive earnings, net of taxes AOCI Attributable to Parent [Member] Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Common stock, outstanding (in shares) Common Stock, Shares, Outstanding Investments and related notes receivable (including $2,331.5 million and $1,865.8 million, respectively, measured at fair value on a recurring basis) (note 5) Long-term investments Long-term Investments Financial Instruments [Domain] Financial Instruments [Domain] Programming and other direct costs of services Cost of Goods and Services Sold Class B Common Class B [Member] Segment Reporting, Measurement Disclosures [Abstract] Segment Reporting, Measurement Disclosures [Abstract] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Other Other Debt [Member] Other Debt [Member] Interest Rate Caps Interest Rate Cap [Member] Period of program Share Repurchase Program, Period Of Program Share Repurchase Program, Period Of Program Total lease expense Lease, Cost Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Equity (note 12): Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Customer relationships Customer Relationships [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Other long-term liabilities (notes 3, 6 and 13) Other Liabilities, Noncurrent EdgeConneX Inc. (EdgeConneX) EdgeConneX Inc. [Member] EdgeConneX Inc. VM Ireland Credit Facility VM Ireland Credit Facility [Member] VM Ireland Credit Facility Debt Instrument [Line Items] Debt Instrument [Line Items] Other Other Equity Related Derivative Instrument [Member] Other Equity Related Derivative Instrument [Member] Adjusted EBITDA Adjusted Earnings Before Interest, Taxes, Depreciation, And Amortization Adjusted Earnings Before Interest, Taxes, Depreciation, And Amortization Total Derivative assets Derivative instruments: Derivative Asset Revenue Business Acquisition, Pro Forma Revenue Related Party Transaction [Domain] Related Party Transaction [Domain] Document Quarterly Report Document Quarterly Report Contractual maturity: Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract] Vendor financing Vendor Financing [Member] Vendor Financing [Member] Proceeds from sale of debt securities Proceeds from Sale of Debt Securities, Available-for-sale Noncurrent portion Long-term Debt, Excluding Current Maturities Schedule of Goodwill [Table] Schedule of Goodwill [Table] Share-based compensation expense Compensation expense Share-based Payment Arrangement, Expense EURIBOR EURIBOR [Member] EURIBOR [Member] Programming commitments Programming Commitments [Member] Programming Commitments [Member] Net earnings (loss) Net earnings (loss) Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest UPC Facilities AT and AX UPC Facilities AT and AX [Member] UPC Facilities AT and AX Class A Common Class A [Member] Accrued Income Taxes [Abstract] Accrued Income Taxes [Abstract] Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Common stock, nominal value (in dollars per share) Common Stock, Par or Stated Value Per Share Property and equipment additions: Equity Method Investment, Summarized Financial Information, Payment to Acquire Property, Plant and Equipment Equity Method Investment, Summarized Financial Information, Payment to Acquire Property, Plant and Equipment Realized gain (losses) Debt Securities, Realized Gain (Loss) Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Other financing activities, net Proceeds from (Payments for) Other Financing Activities Gross carrying amount Finite-Lived Intangible Assets, Gross Entity Central Index Key Entity Central Index Key Schedule of Intangible Assets Subject to Amortization, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Security Exchange Name Security Exchange Name Balance of net assets at January 1, 2021 Balance of net assets at June 30, 2021 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Other comprehensive earnings (loss) Other comprehensive earnings (loss) , net of tax Other Comprehensive Income (Loss), Net of Tax Current Fiscal Year End Date Current Fiscal Year End Date Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Equity Stockholders' Equity Note Disclosure [Text Block] Classes of Assets and Liabilities Held for Sale Disposal Groups, Including Discontinued Operations [Table Text Block] UPC Austria UPC Austria [Member] UPC Austria [Member] Non-operating income (expense): Nonoperating Income (Expense) [Abstract] Net cash used by investing activities Net Cash Provided by (Used in) Investing Activities Other Other Other Contract [Member] Number of equal purchase price in poland operations Business Acquisition, Consideration Transferred, Multiple Of Adjusted EBITDA Business Acquisition, Consideration Transferred, Multiple Of Adjusted EBITDA Fixed-line telephony Cable Fixed-line Telephony Subscription [Member] Cable Fixed-line Telephony Subscription [Member] Class of Stock [Domain] Class of Stock [Domain] Diluted earnings (loss) (attributable to Liberty Global shareholders per share (in dollars per share) Business Acquisition, Pro Forma Income (Loss) From Continuing Operations, Net Of Tax, Diluted Business Acquisition, Pro Forma Income (Loss) From Continuing Operations, Net Of Tax, Diluted Operating cash outflows from finance leases Finance Lease, Interest Payment on Liability Maximum borrowing capacity Facility amount Line of Credit Facility, Maximum Borrowing Capacity Foreign currency translation adjustments and other Goodwill, Foreign Currency Translation Gain (Loss) Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Ownership [Domain] Ownership [Domain] Sunrise Acquisition Sunrise Acquisition [Member] Sunrise Acquisition Restricted cash included in assets held for sale Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations Gains included in net earnings (loss) Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract] VodafoneZiggo JV VodafoneZiggo JV and VMED O2 JV [Member] VodafoneZiggo JV and VMED O2 JV Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] UPCB SPE Notes UPCB SPE Notes [Member] UPCB SPE Notes [Member] Other current assets Other Assets, Current Initial investment percent Alternative Investment, Measurement Input Subscription revenue Mobile Subscription [Member] Mobile Subscription [Member] Other assets, net Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent Deferred financing costs, discounts and premiums, net Debt Instrument, Unamortized Discount (Premium), Net Computed “expected” tax benefit (expense) Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Beginning of period End of period Total cash and cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Liabilities Derivative Liability [Abstract] Percentage of net present value, cost savings Percentage of Net Present Value, Cost Savings Percentage of Net Present Value, Cost Savings Extinguishment of debt Extinguishment of Debt, Amount Equity-related derivative instruments: Equity-related derivative instruments Equity Contract [Member] Net earnings (loss) Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Accrued income taxes (note 11) Accrued Income Taxes, Current Write off deferred financing costs Write off of Deferred Debt Issuance Cost Basis Swaps Basis Swap [Member] Thereafter Unrecorded Unconditional Purchase Obligation, to be Paid, after Year Five Gain (loss) in changes in the credit risk valuation adjustments associated with our cross-currency and interest rate derivative contracts Gain Loss On Credit Risk Derivatives Net Recognized In Earnings Gain Loss On Credit Risk Derivatives Net Recognized In Earnings Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Accrued Liabilities, Current