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Derivative Instruments (Interest Rate Collars) (Schedule) (Details) (Interest Rate Collar [Member], EUR €)
In Millions, unless otherwise specified
Dec. 31, 2014
January 2015 — January 2020 1135.0 EUR [Member] | UPC Broadband Holding [Member]
  
Derivative [Line Items]  
Notional amount of derivative € 1,135.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= lbtya_January2015January202011350EurMember
/ us-gaap_DerivativeInstrumentRiskAxis
= lbtya_InterestRateCollarMember
/ dei_LegalEntityAxis
= lbtya_UpcBroadbandHoldingMember
EURIBOR floor rate 1.00%us-gaap_DerivativeFloorInterestRate
/ us-gaap_DerivativeByNatureAxis
= lbtya_January2015January202011350EurMember
/ us-gaap_DerivativeInstrumentRiskAxis
= lbtya_InterestRateCollarMember
/ dei_LegalEntityAxis
= lbtya_UpcBroadbandHoldingMember
EURIBOR cap rate 3.54%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeByNatureAxis
= lbtya_January2015January202011350EurMember
/ us-gaap_DerivativeInstrumentRiskAxis
= lbtya_InterestRateCollarMember
/ dei_LegalEntityAxis
= lbtya_UpcBroadbandHoldingMember
July 2017 650.0 EUR [Member] | Telenet International [Member]
  
Derivative [Line Items]  
Notional amount of derivative € 650.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= lbtya_July2017650.0EURMember
/ us-gaap_DerivativeInstrumentRiskAxis
= lbtya_InterestRateCollarMember
/ dei_LegalEntityAxis
= lbtya_TelenetInternationalMember
EURIBOR floor rate 2.00%us-gaap_DerivativeFloorInterestRate
/ us-gaap_DerivativeByNatureAxis
= lbtya_July2017650.0EURMember
/ us-gaap_DerivativeInstrumentRiskAxis
= lbtya_InterestRateCollarMember
/ dei_LegalEntityAxis
= lbtya_TelenetInternationalMember
EURIBOR cap rate 4.00%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeByNatureAxis
= lbtya_July2017650.0EURMember
/ us-gaap_DerivativeInstrumentRiskAxis
= lbtya_InterestRateCollarMember
/ dei_LegalEntityAxis
= lbtya_TelenetInternationalMember