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Revenue Recognition - Additional Information (Details) - Retained Earnings - USD ($) $ in Millions | Jan. 01, 2019 | Jan. 01, 2018
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Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative effect of accounting change | $ 0 | $ (8) | [1]
ASU 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative effect of accounting change |  | $ (8) |
[1] | Financial information for prior periods has been recast to reflect the retrospective application of the successful efforts method of accounting. See Note 1.

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