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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Change in accounting policy |  |  | $ 2 | $ 176 |
Amounts recorded gross in revenues that are billed to customers and remitted to governmental authorities |  | $ 53 | 67 | 58 |
Revenue recognized | $ 128 |  |  |  |
Capitalized contract cost |  |  |  |  |
Capitalized contract cost related to commission fees |  | 133 | 139 |  |
Amortization of contract cost assets |  | $ 109 | 108 |  |
Retained earnings |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Change in accounting policy |  |  | $ 2 | $ 175 |
ASC 606 | Retained earnings |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Change in accounting policy |  |  |  |  | $ 175

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