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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of revenue
Revenue from contracts with customers	$ 961	$ 988
Operating lease income	25	22
Total operating revenues	986	1,010
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	742	765
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	691	702
Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	9	21
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	42	42
Transferred at point in time | Equipment sales
Disaggregation of revenue
Revenue from contracts with customers	$ 219	$ 223

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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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