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Revenue Recognition - Additional Information (Details) - Retained earnings - USD ($) $ in Millions | Jan. 01, 2019 | Jan. 01, 2018 | Jan. 01, 2017
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Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative effect of change in accounting principle | $ 0 | $ 8 | $ 0
ASU 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative effect of change in accounting principle |  | $ 8 |

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