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Segment Reporting (Narrative) (Details)
 12 Months Ended
Dec. 31, 2014
Segment Reporting Information [Line Items]  
Threshold percentage used to determine reportable segments using one of three criteria of revenue, operating cash flow or total assets (more than 10%) 10.00%lbtya_ThresholdPercentageOfRevenueOperatingCashFlowsOrTotalAssetsUsedToIdentifyReportableSegments
Performance measures, percentage of reportable segment revenue and operating cash flow presented 100.00%lbtya_PerformanceMeasuresPercentageOfReportableSegmentRevenueAndOperatingCashFlowPresented
Total European Operations Division [Member]  
Segment Reporting Information [Line Items]  
Number of European countries in operating segment (in countries) 12lbtya_NumberOfEuropeanCountriesInOperatingSegment
/ us-gaap_StatementBusinessSegmentsAxis
= lbtya_TotalEuropeanOperationsDivisionMember
Telenet and Liberty Puerto Rico [Member]  
Segment Reporting Information [Line Items]  
Percentage of minority interest revenues and expenses included in net earnings attributable to noncontrolling interest 100.00%lbtya_PercentageOfMinorityInterestRevenuesAndExpensesFromConsolidatedStatementsOfOperationsIncludedInNetEarningsAttributableToNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= lbtya_TelenetandLibertyPuertoRicoMember