v3.10.0.1

Debt and Capital Lease Obligations (Non-cash Financing Transactions) (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Debt and Capital Lease Obligations [Abstract]
Non-cash borrowings and repayments of debt	$ 2,453.1	$ 6,546.2

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- Definition

Non-Cash Borrowings and Repayments of Debt

+ References

No definition available.

+ Details

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Namespace Prefix:	lbtya_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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