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Basis of Presentation (Narrative) (Details)
3 Months Ended
Mar. 31, 2022
Jun. 01, 2021
Telenet    
Schedule of Equity Method Investments [Line Items]    
Percentage ownership in subsidiary 61.20%  
VodafoneZiggo JV    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 50.00%  
Co-venturer ownership percentage 50.00%  
VMO2 JV    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 50.00% 50.00%
Co-venturer ownership percentage 50.00%  
Telefonica    
Schedule of Equity Method Investments [Line Items]    
Co-venturer ownership percentage 50.00%  
Vodafone Group Inc.    
Schedule of Equity Method Investments [Line Items]    
Co-venturer ownership percentage 50.00%