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Share-based Compensation (Narrative) (Details)
 3 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Mar. 31, 2010
May 01, 2014
Jan. 31, 2014
Jun. 24, 2013
PSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percent of award earned 66.30%lbtya_SharebasedCompensationArrangementbySharebasedPaymentAwardPercentofAwardEarned
/ us-gaap_AwardTypeAxis
= lbtya_PerformanceShareUnitsPSUsMember		          
PSUs [Member] | Class C Ordinary Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)   1,048,614us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= lbtya_PerformanceShareUnitsPSUsMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_ClassCOrdinarySharesMember		        
Liberty Global Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share authorized (in shares)   89,582,279us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalIncentivePlanMember		        
Award term   10 years        
Liberty Global Incentive Plan [Member] | Awards other than Performance-Based Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award term   7 years        
Liberty Global Incentive Plan [Member] | Six Month Anniversary After Grant Date [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage   12.50%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalIncentivePlanMember
/ us-gaap_VestingAxis
= lbtya_SixMonthAnniversaryAfterGrantDateMember		        
Liberty Global Incentive Plan [Member] | Each Quarter Thereafter after Six Month Vest [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage   6.25%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalIncentivePlanMember
/ us-gaap_VestingAxis
= lbtya_EachQuarterThereafterafterSixMonthVestMember		        
VM Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award term   10 years        
Service period   5 years        
Liberty Global Director Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share authorized (in shares)   9,745,984us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalDirectorIncentivePlanMember		        
Award term   10 years        
Number of equal or semi-equal installments   3lbtya_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofEqualorSemiEqualInstallments
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalDirectorIncentivePlanMember		        
Liberty Global 2014 Incentive Plans [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share authorized (in shares)   100,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobal2014IncentivePlansMember		        
Liberty Global 2014 Incentive Plans [Member] | Class B Ordinary Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share authorized (in shares)   50,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobal2014IncentivePlansMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_ClassBOrdinarySharesMember		        
Liberty Global 2014 Incentive Plans [Member] | Anti-Dilution and Other Adjustment Provisions [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share authorized (in shares)   10,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobal2014IncentivePlansMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_AntiDilutionandOtherAdjustmentProvisionsMember		        
Previous Incentive Plans [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share authorized (in shares)         0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= lbtya_PreviousIncentivePlansMember		  
Liberty Global PSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage     50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalPSUsMember		      
Liberty Global PSUs [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance period   2 years        
Performance range     75.00%lbtya_ShareBasedCompensationPerformanceRange
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalPSUsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Expected performance earnings for PSUs     50.00%lbtya_ExpectedPerformanceEarningsPercentageForPsus
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalPSUsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Liberty Global PSUs [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance range     125.00%lbtya_ShareBasedCompensationPerformanceRange
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalPSUsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Expected performance earnings for PSUs     150.00%lbtya_ExpectedPerformanceEarningsPercentageForPsus
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalPSUsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Liberty Global PSUs [Member] | Series A and Series C Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exchange value, right to receive shares     1lbtya_ExchangeValueRighttoReceiveShares
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalPSUsMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_CommonClassAAndClassCMember		      
Percentage of annual award of PSUs     66.66%lbtya_RatioOfAnnualPsuAwards
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalPSUsMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_CommonClassAAndClassCMember		      
Percentage of annual of award of SARs     33.33%lbtya_RatioOfAnnualSarAwards
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalPSUsMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_CommonClassAAndClassCMember		      
Liberty Global Challenge Performance Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award term   7 years        
Liberty Global Challenge Performance Awards [Member] | Class A Ordinary Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of ordinary share rights for each performance share           1lbtya_NumberofOrdinarySharesRightsforEachPerformanceShare
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalChallengePerformanceAwardsMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_ClassOrdinarySharesMember
Liberty Global Challenge Performance Awards [Member] | Class C Ordinary Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of ordinary share rights for each performance share           1lbtya_NumberofOrdinarySharesRightsforEachPerformanceShare
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalChallengePerformanceAwardsMember
/ us-gaap_StatementClassOfStockAxis
= lbtya_ClassCOrdinarySharesMember
Liberty Global Challenge Performance Awards [Member] | June 24th, 2016 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage   100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= lbtya_LibertyGlobalChallengePerformanceAwardsMember
/ us-gaap_VestingAxis
= lbtya_June24th2016Member		        
Performance Grant Award [Member] | Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)       1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= lbtya_PerformanceGrantAwardMember		    
Number of equal or semi-equal installments   3lbtya_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofEqualorSemiEqualInstallments
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= lbtya_PerformanceGrantAwardMember