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Share-based Compensation (Narrative) (Details)	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Percent of annual incentive compensation receivable in shares	100.00%

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- Definition

Shareholder Inventive Program, Percent of Annual Incentive Compensation

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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