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Revenue Recognition - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Cumulative effect of accounting changes |  |  |  |  | $ 193,000,000
Bad debts expense |  | $ 71,000,000 | $ 68,000,000 |  |
Capitalized contract cost |  |  |  |  |
Amortization of contract cost assets | $ 31,000,000 | 93,000,000 |  |  |
Impairment of capitalized contract cost | 0 | 0 |  |  |
Retained earnings |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Cumulative effect of accounting changes |  |  |  |  | $ 163,000,000
Revenue from contract with customer |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Bad debts expense | $ 27,000,000 | $ 70,000,000 |  |  |
ASU 2014-09 | Retained earnings |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Cumulative effect of accounting changes |  |  |  | $ 163,000,000 |

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