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Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 5,873	$ 5,676	$ 5,733
Subsidy and other revenue	64	75	54
Total revenue	5,937	5,751	5,787
Revenue from contracts with customers, performance obligation	962
Lease revenue	52	62	63
Data And Internet Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,963	3,534	3,390
Voice Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,231	1,373	1,498
Video Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	344	430	520
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	335	339	325
Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,163	3,097	3,116
Business And Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,710	$ 2,579	$ 2,617

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