Derivative Instruments (Interest Rate Collars) (Schedule) (Details) - Interest Rate Collar [Member] - UPC Broadband Holding [Member] € in Millions	Mar. 31, 2016 EUR (€)
Derivative [Line Items]
Notional amount of derivative	€ 1,135.0
Minimum rate	1.00%
Maximum rate	3.54%

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
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- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lbtya_InterestRateCollarMember
Namespace Prefix:
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- Details

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Namespace Prefix:
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