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Revenue Recognition, Disaggregation Of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Revenue from contracts with customers |  |  |
Revenue from contracts with customers | [1] | $ 957 | $ 1,882
Transferred over time |  |  |
Revenue from contracts with customers |  |  |
Revenue from contracts with customers |  | 724 | 1,432
Transferred over time | Retail service |  |  |
Revenue from contracts with customers |  |  |
Revenue from contracts with customers |  | 652 | 1,301
Transferred over time | Inbound roaming |  |  |
Revenue from contracts with customers |  |  |
Revenue from contracts with customers |  | 39 | 66
Transferred over time | Other service |  |  |
Revenue from contracts with customers |  |  |
Revenue from contracts with customers |  | 33 | 65
Transferred at point in time |  |  |
Revenue from contracts with customers |  |  |
Revenue from contracts with customers |  | $ 233 | $ 450
[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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