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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of revenue
Revenue from contracts with customers	$ 938	$ 1,060	$ 2,831	$ 3,052
Operating lease income	25	23	75	68
Total operating revenues	963	1,083	2,906	3,120
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	737	758	2,214	2,283
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	687	696	2,065	2,098
Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	8	17	25	56
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	42	45	124	129
Transferred at point in time | Equipment sales
Disaggregation of revenue
Revenue from contracts with customers	$ 201	$ 302	$ 617	$ 769

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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