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Basis of Presentation (Narrative) (Details)	3 Months Ended
	Mar. 31, 2021
Telenet
Schedule of Equity Method Investments [Line Items]
Percentage ownership in subsidiary	60.70%
VodafoneZiggo JV
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Co-venturer ownership percentage	50.00%

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- Definition

Equity Method Investment, Co-Venturer Ownership Percentage

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- 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.

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- Definition

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

+ References

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