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Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,533	$ 1,471	$ 4,550	$ 4,383
Subsidy and other revenue	17	18	50	48
Total revenue	1,550	1,489	4,600	4,431
Lease revenue	12	13	38	40
Revenue from contracts with customers, performance obligation	942		942
Data And Internet Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,120	1,004	3,254	2,934
Voice Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	272	301	844	934
Video Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	63	83	205	265
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	78	83	247	250
Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	826	789	2,464	2,365
Business And Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 707	$ 682	$ 2,086	$ 2,018

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