Commitments and Contingencies (Narrative) (Details) SFr in Millions, € in Billions	1 Months Ended				3 Months Ended
	Jan. 31, 2023 USD ($)	Jan. 31, 2023 CHF (SFr)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 08, 2017 subsidiary	Nov. 26, 2007 association
Loss Contingencies [Line Items]
Programming costs					$ 152,800,000	$ 154,100,000
Percentage of amounts recovered					50.00%
Percentage of net present value, cost savings					50.00%
Percentage of legal and other third party, fees					50.00%
Deutsche Telekom Litigation
Loss Contingencies [Line Items]
Reduction of annual lease fees					83.33%
Interkabel Acquisition
Loss Contingencies [Line Items]
Number of associations of municipalities | association								4
Damages sought			$ 1,500,000,000	€ 1.4
Loss contingency accrual					$ 0
Swisscom MVNO Matter
Loss Contingencies [Line Items]
Damages sought	$ 100,000,000	SFr 90
Number of subsidiaries | subsidiary							1