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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of revenue
Revenue from contracts with customers	$ 1,004	$ 994	$ 1,992	$ 1,996
Operating lease income	23	20	45	41
Total operating revenues	1,027	1,014	2,037	2,037
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	760	754	1,525	1,504
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	700	684	1,402	1,367
Transferred over time | Retail service | Prior period reclassification
Disaggregation of revenue
Revenue from contracts with customers		(2)		(4)
Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	18	28	39	56
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	42	42	84	81
Transferred at point in time | Other service | Prior period reclassification
Disaggregation of revenue
Revenue from contracts with customers		2		4
Transferred at point in time | Equipment sales
Disaggregation of revenue
Revenue from contracts with customers	$ 244	$ 240	$ 467	$ 492

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