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Revenue Recognition, Disaggregation Of Revenue (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Revenue from contracts with customers |  |
Revenue from contracts with customers | $ 926 | [1]
Transferred over time |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 708 |
Transferred over time | Retail service |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 649 |
Transferred over time | Inbound roaming |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 27 |
Transferred over time | Other service |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | 32 |
Transferred at point in time |  |
Revenue from contracts with customers |  |
Revenue from contracts with customers | $ 218 |
[1] | These amounts do not include revenues outside the scope of ASU 2014-09; therefore, revenue line items in this table will not agree to amounts presented in the Consolidated Statement of Operations.

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