v3.10.0.1

Long-lived Assets (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Long-lived Assets [Abstract] |  |
Noncash vendor financing arrangement, cash increase, excluding value added tax | $ 1,187.9 | $ 1,164.1
Value added tax, vendor financing arrangement | 186.1 | 184.1
Capital leases | $ 46.5 | $ 97.9

X
- Definition Long lived Assets [Abstract] + References No definition available. + Details
Name: | lbtya_LonglivedAssetsAbstract
Namespace Prefix: | lbtya_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- 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

X
- Definition The increase during the period in capital lease obligations due to entering into new capital leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
Name: | us-gaap_CapitalLeaseObligationsIncurred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration