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v3.21.1

Long-lived Assets (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Property, Plant and Equipment [Abstract] |  |
Noncash vendor financing arrangement, cash increase, excluding value added tax | $ 328.2 | $ 370.9
Value added tax, vendor financing arrangement | $ 41.4 | $ 63.6

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- Definition Property Plant And Equipment, Additions, Vendor Financing Arrangement + References No definition available. + Details
Name: | lbtya_PropertyPlantAndEquipmentAdditionsVendorFinancingArrangement
Namespace Prefix: | lbtya_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Value Added Tax, Vendor Financing Arrangement + References No definition available. + Details
Name: | lbtya_ValueAddedTaxVendorFinancingArrangement
Namespace Prefix: | lbtya_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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