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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of revenue
Revenue from contracts with customers	$ 1,003	$ 944
Operating lease income	20	19
Total operating revenues	1,023	963
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	751	743
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	685	671
Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	28	37
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	38	35
Transferred at point in time | Equipment sales
Disaggregation of revenue
Revenue from contracts with customers	$ 252	$ 201

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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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