Segment Reporting (Narrative) (Details)	6 Months Ended
Jun. 30, 2021	Jun. 01, 2021
Segment Reporting Information [Line Items]
Performance measures, percentage of reportable segment revenue and operating cash flow presented	100.00%
VMED O2 JV
Segment Reporting Information [Line Items]
Ownership percentage	50.00%	50.00%
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Ownership percentage	50.00%
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Percentage of minority interest revenues and expenses included in net earnings attributable to noncontrolling interest	100.00%
Telenet
Segment Reporting Information [Line Items]
Percentage of minority interest revenues and expenses included in net earnings attributable to noncontrolling interest	100.00%

Percentage Of Minority Interest Revenues And Expenses From Consolidated Statements Of Operations Included In Net Earnings Attributable To Noncontrolling Interest

No definition available.

+ Details

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- Definition

Performance Measures Percentage Of Reportable Segment Revenue And Operating Cash Flow Presented

+ References

No definition available.

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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.

+ References

No definition available.

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