Fair Value Measurements (Assets and Liabilities Reconciliation) (Schedule and Footnote) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Fair Value, Assets and Liabilities (Net) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance of asset (liability)	$ 612.9
Termination and other activity related to Ziggo Collar	212.5
Gains (losses) included in loss from continuing operations:
Realized and unrealized losses on derivative instruments, net	(236.3)
Realized and unrealized gain due to changes in fair values of certain investments, net	26.1
Foreign currency translation adjustments, dividends and other, net	15.0
Ending balance of asset (liability)	630.2
Investments [Member]
Fair Value, Assets and Liabilities (Net) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance of asset (liability)	299.4
Termination and other activity related to Ziggo Collar	0
Gains (losses) included in loss from continuing operations:
Realized and unrealized losses on derivative instruments, net	0
Realized and unrealized gain due to changes in fair values of certain investments, net	26.1
Foreign currency translation adjustments, dividends and other, net	(7.1)
Ending balance of asset (liability)	318.4
Equity-related derivative instruments [Member]
Fair Value, Assets and Liabilities (Net) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance of asset (liability)	313.5
Termination and other activity related to Ziggo Collar	212.5
Gains (losses) included in loss from continuing operations:
Realized and unrealized losses on derivative instruments, net	(236.3)
Realized and unrealized gain due to changes in fair values of certain investments, net	0
Foreign currency translation adjustments, dividends and other, net	22.1
Ending balance of asset (liability)	$ 311.8

Name:	lbtya_FairValueAssetsAndLiabilitiesNetMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix:	lbtya_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Additions

+ References

No definition available.

+ Details

Name:	lbtya_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetandLiabilityAdditions
Namespace Prefix:	lbtya_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Derivative Instrument Gain (Loss) Included in Earnings

+ References

No definition available.

+ Details

Name:	lbtya_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityDerivativeInstrumentGainLossIncludedInEarnings
Namespace Prefix:	lbtya_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Gain (Loss) Included in Earnings

+ References

No definition available.

+ Details

Name:	lbtya_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInEarnings
Namespace Prefix:	lbtya_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Foreign Currency Translation Adjustments

+ References

No definition available.

+ Details

Name:	lbtya_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityForeignCurrencyTranslationAdjustments
Namespace Prefix:	lbtya_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents assets and liabilities, net, measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

No definition available.

+ Details

Name:	lbtya_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityNetValue
Namespace Prefix:	lbtya_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_InvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: