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

X
- Definition Non-Cash Borrowings and Repayments of Debt + References No definition available. + Details
Name: | lbtya_NonCashBorrowingsandRepaymentsofDebt
Namespace Prefix: | lbtya_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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