Additional basis points on discount rate used to calculate redemption premium on debt instrument.

No definition available.

Name:	lbtya_DebtInstrumentAdditionalBasisPointsonDiscountRateUsedtoCalculateRedemptionPremium
Namespace Prefix:	lbtya_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Floor Interest Rate

+ References

No definition available.

+ Details

Name:	lbtya_DebtInstrumentFloorInterestRate
Namespace Prefix:	lbtya_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Issuance Price Percentage

+ References

No definition available.

+ Details

Name:	lbtya_DebtInstrumentIssuancePricePercentage
Namespace Prefix:	lbtya_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Special Purpose Financing Entity Ownership by Third Party

+ References

No definition available.

+ Details

Name:	lbtya_SpecialPurposeFinancingEntityOwnershipbyThirdParty
Namespace Prefix:	lbtya_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=lbtya_UPCFacilityANMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ExtinguishmentOfDebtAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lbtya_UPCFacilityAOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=lbtya_UpcHoldingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MediumTermNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lbtya_UPCFacilityAPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lbtya_UPCHolding3.875SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lbtya_UPCHolding6.375SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=lbtya_UpcBroadbandHoldingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=lbtya_UPCBFinanceVIIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lbtya_UPCBFinanceVIINotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt and Capital Lease Obligations (UPC Holding Refinancing Transactions) (Details)	1 Months Ended			6 Months Ended
	Jun. 30, 2017 EUR (€)	Jun. 30, 2017 USD ($)	Feb. 28, 2017 USD ($)	Jun. 30, 2017 EUR (€)	Jun. 30, 2017 USD ($)	Jan. 31, 2017
UPC Facility AN [Member] \| Long-term Debt [Member]
Debt Instrument [Line Items]
Extinguishment of debt			$ 2,150,000,000.0
UPC Facility AO [Member] \| Long-term Debt [Member]
Debt Instrument [Line Items]
Extinguishment of debt	€ 600,000,000	$ 684,800,000
UPC Holding [Member] \| Medium-term Notes [Member] \| UPC Facility AP [Member]
Debt Instrument [Line Items]
Principal amount of debt			$ 2,150,000,000.0
Issued at par percentage			99.75%
UPC Holding [Member] \| Medium-term Notes [Member] \| UPC Facility AP [Member] \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			2.75%
Floor rate			0.00%
UPC Holding [Member] \| Long-term Debt [Member] \| UPC Holding 3.875% Senior Notes [Member] \| 2022
Debt Instrument [Line Items]
Redemption price				101.938%
UPC Holding [Member] \| Long-term Debt [Member] \| UPC Holding 3.875% Senior Notes [Member] \| 2023
Debt Instrument [Line Items]
Redemption price				100.969%
UPC Holding [Member] \| Long-term Debt [Member] \| UPC Holding 3.875% Senior Notes [Member] \| 2024
Debt Instrument [Line Items]
Redemption price				100.484%
UPC Holding [Member] \| Long-term Debt [Member] \| UPC Holding 3.875% Senior Notes [Member] \| 2025 and thereafter
Debt Instrument [Line Items]
Redemption price				100.00%
UPC Holding [Member] \| Senior Notes [Member] \| UPC Holding 3.875% Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt	€ 635,000,000.0			€ 635,000,000.0	$ 724,700,000
Interest rate	3.875%			3.875%	3.875%
Additional basis points used to determine redemption premium	0.50%			0.50%	0.50%
UPC Holding [Member] \| Senior Notes [Member] \| UPC Holding 6.375% Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt	€ 600,000,000.0			€ 600,000,000.0	$ 684,800,000
UPC Broadband Holding [Member] \| UPC Facility AN [Member] \| Long-term Debt [Member]
Debt Instrument [Line Items]
Loss on debt modification and extinguishment			$ 8,900,000
UPC Broadband Holding [Member] \| UPC Facility AO [Member] \| Long-term Debt [Member]
Debt Instrument [Line Items]
Loss on debt modification and extinguishment		$ 5,400,000
UPCB Finance VII [Member]
Debt Instrument [Line Items]
Special purpose financing entity ownership by third party	100.00%			100.00%	100.00%
UPCB Finance VII [Member] \| Long-term Debt [Member] \| UPCB Finance VII Notes [Member] \| 2022
Debt Instrument [Line Items]
Redemption price				101.813%
UPCB Finance VII [Member] \| Long-term Debt [Member] \| UPCB Finance VII Notes [Member] \| 2023
Debt Instrument [Line Items]
Redemption price				100.906%
UPCB Finance VII [Member] \| Long-term Debt [Member] \| UPCB Finance VII Notes [Member] \| 2024
Debt Instrument [Line Items]
Redemption price				100.453%
UPCB Finance VII [Member] \| Long-term Debt [Member] \| UPCB Finance VII Notes [Member] \| 2025 and thereafter
Debt Instrument [Line Items]
Redemption price				100.00%
UPCB Finance VII [Member] \| Senior Notes [Member] \| UPCB Finance VII Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt	€ 600,000,000.0			€ 600,000,000.0	$ 684,800,000
Interest rate	3.625%			3.625%	3.625%
Additional basis points used to determine redemption premium						0.50%