XML 64 R53.htm IDEA: XBRL DOCUMENT
v3.21.1

Derivative Instruments (Interest Rate Swap Contracts and Options) (Details) - Notional amount - Interest Rate Swap $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($)
UPC Holding |
Derivative [Line Items] |
Notional amount of derivative | $ 8,996.6
Weighted average remaining life | 3 years 9 months 18 days
Telenet |
Derivative [Line Items] |
Notional amount of derivative | $ 3,389.0
Weighted average remaining life | 4 years
UPC Holding |
Derivative [Line Items] |
Notional amount of derivative | $ 4,713.8
Weighted average remaining life | 4 years 8 months 12 days
Telenet |
Derivative [Line Items] |
Notional amount of derivative | $ 1,676.7
Weighted average remaining life | 2 years 6 months

X
- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageRemainingMaturity1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_CounterpartyNameAxis=lbtya_DueFromCounterpartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=lbtya_UpcHoldingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=lbtya_TelenetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=lbtya_DueToCounterpartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |