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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of revenue
Revenue from contracts with customers	$ 994	$ 954	$ 1,996	$ 1,899
Operating lease income	20	19	41	38
Total operating revenues	1,014	973	2,037	1,937
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	754	734	1,504	1,477
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	686	658	1,371	1,329
Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	28	41	56	77
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	40	35	77	71
Transferred at point in time | Equipment sales
Disaggregation of revenue
Revenue from contracts with customers	$ 240	$ 220	$ 492	$ 422

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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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