Basis of Presentation (Narrative) (Details)	12 Months Ended
	Dec. 31, 2021	Jun. 01, 2021
Telenet
Basis of Presentation [Line Items]
Percentage ownership in subsidiary	60.80%
VodafoneZiggo JV
Basis of Presentation [Line Items]
Ownership percentage	50.00%
Co-venturer ownership percentage	50.00%
Telefónica
Basis of Presentation [Line Items]
Co-venturer ownership percentage	50.00%
VMO2 JV
Basis of Presentation [Line Items]
Ownership percentage	50.00%	50.00%
Co-venturer ownership percentage		50.00%