v3.10.0.1

Segment Reporting (Capital Expenditures of Reportable Segments) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |
Total consolidated property and equipment additions | $ 1,850.4 | $ 1,631.7
Assets acquired under capital-related vendor financing arrangements | (1,187.9) | (1,164.1)
Assets acquired under capital leases | (46.5) | (97.9)
Changes in current liabilities related to capital expenditures | 181.8 | 218.3
Third-party payments | 855.1 | 782.9
Proceeds received for transfers to related parties | (57.3) | (194.9)
Total capital expenditures, net | 797.8 | 588.0
U.K./Ireland |  |
Segment Reporting Information [Line Items] |  |
Total consolidated property and equipment additions | 1,040.1 | 970.7
Belgium |  |
Segment Reporting Information [Line Items] |  |
Total consolidated property and equipment additions | 355.2 | 288.4
Switzerland |  |
Segment Reporting Information [Line Items] |  |
Total consolidated property and equipment additions | 105.2 | 96.5
Central and Eastern Europe |  |
Segment Reporting Information [Line Items] |  |
Total consolidated property and equipment additions | 71.9 | 117.0
Central and Corporate |  |
Segment Reporting Information [Line Items] |  |
Total consolidated property and equipment additions | 278.0 | 159.1
VodafoneZiggo JV |  |
Segment Reporting Information [Line Items] |  |
Property and equipment additions - VodafoneZiggo JV | $ 476.6 | $ 444.5

X
- Definition Assets Acquired Under Capital-Related Vendor Financing Arrangements + References No definition available. + Details
Name: | lbtya_AssetsAcquiredUnderCapitalRelatedVendorFinancingArrangements
Namespace Prefix: | lbtya_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity Method Investment, Summarized Financial Information, Payment to Acquire Property, Plant and Equipment + References No definition available. + Details
Name: | lbtya_EquityMethodInvestmentSummarizedFinancialInformationPaymenttoAcquirePropertyPlantandEquipment
Namespace Prefix: | lbtya_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase Decrease in Current Liabilities Related to Capital Expenditures + References No definition available. + Details
Name: | lbtya_IncreaseDecreaseInCurrentLiabilitiesRelatedToCapitalExpenditures
Namespace Prefix: | lbtya_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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

X
- Definition The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsForCapitalImprovements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash outflow for the purchase of or improvements to tangible or intangible assets, used to produce goods or deliver services, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireOtherProductiveAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromContributionsFromAffiliates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lbtya_U.K.IrelandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=country_BE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=country_CH
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lbtya_CentralandEasternEuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lbtya_CentralandCorporateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=lbtya_VodafoneZiggoJVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |