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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of revenue
Revenue from contracts with customers	$ 988	$ 1,003
Operating lease income	22	20
Total operating revenues	1,010	1,023
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	765	751
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	702	683
Transferred over time | Retail service | Prior period reclassification
Disaggregation of revenue
Revenue from contracts with customers		(2)
Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	21	28
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	42	40
Transferred at point in time | Other service | Prior period reclassification
Disaggregation of revenue
Revenue from contracts with customers		2
Transferred at point in time | Equipment sales
Disaggregation of revenue
Revenue from contracts with customers	$ 223	$ 252

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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