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Defined Benefit Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]  
Estimated future subsidiaries contributions in next fiscal year 58.5lbtya_DefinedBenefitPlanEstimatedFutureSubsidiaryContributionsinNextFiscalYear
Equity securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target asset mix 27.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
Debt securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target asset mix 26.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
Insurance contract [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target asset mix 20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= lbtya_InsuranceContractMember
Hedge funds [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target asset mix 11.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_HedgeFundsMember
Guarantee investment contracts [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target asset mix 8.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_InvestmentContractsMember
Real estate [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target asset mix 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_RealEstateMember
Other [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target asset mix 3.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= lbtya_OtherDefinedBenefitPlanAssetCategoryMember