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Debt and Capital Lease Obligations (VM Convertible Notes) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Jun. 07, 2013
Apr. 30, 2008
Virgin Media Acquisition [Member]      
Debt Instrument [Line Items]      
Additional paid-in capital   $ (1,660,000,000)lbtya_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAdditionalPaidInCapital
/ us-gaap_BusinessAcquisitionAxis
= lbtya_VirginMediaAcquisitionMember
 
VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Principal amount of debt 54,800,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
  1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
Stated interest rate of debt     6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
Fair value of debt 113,700,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
2,716,800,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
 
Debt conversion amount 885,100,000us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
   
Debt conversion, principal amount 944,200,000us-gaap_DebtConversionOriginalDebtAmount1
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
   
Debt Component [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Fair value of debt   1,056,800,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
/ us-gaap_LongtermDebtTypeAxis
= lbtya_DebtComponentMember
 
Equity Component [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Fair value of debt 998,800,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
/ us-gaap_LongtermDebtTypeAxis
= lbtya_EquityComponentMember
   
Exchange Per $1000 Principal Amount [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Debt conversion amount 910.51us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
/ us-gaap_LongtermDebtTypeAxis
= lbtya_ExchangePer1000PrincipalAmountMember
   
Debt conversion, principal amount $ 1,000us-gaap_DebtConversionOriginalDebtAmount1
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
/ us-gaap_LongtermDebtTypeAxis
= lbtya_ExchangePer1000PrincipalAmountMember
   
Class A Ordinary Shares [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Shares issued upon conversion 13,100,000us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_ClassOrdinarySharesMember
   
Class A Ordinary Shares [Member] | Exchange Per $1000 Principal Amount [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Shares issued upon conversion 13.4339us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
/ us-gaap_LongtermDebtTypeAxis
= lbtya_ExchangePer1000PrincipalAmountMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_ClassOrdinarySharesMember
   
Class C Ordinary Shares [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Shares issued upon conversion 9,800,000us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_ClassCOrdinarySharesMember
   
Class C Ordinary Shares [Member] | Exchange Per $1000 Principal Amount [Member] | VM Convertible Notes [Member]      
Debt Instrument [Line Items]      
Shares issued upon conversion 33.4963us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_DebtInstrumentAxis
= lbtya_VMConvertibleNotesMember
/ us-gaap_LongtermDebtTypeAxis
= lbtya_ExchangePer1000PrincipalAmountMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_ClassCOrdinarySharesMember