v3.10.0.1

Debt and Capital Lease Obligations (Non-cash Financing Transactions) (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt and Capital Lease Obligations [Abstract] |  |  |
Non-cash borrowings and repayments of debt | $ 2,583.3 | $ 17,104.0 | $ 8,939.5

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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
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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