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Income Taxes - Components of the Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
U.S. Federal: |  |  |  |  |  |
Current |  |  |  |  | $ 2 | $ (14)
Deferred |  |  |  |  | (1) | (2)
U.S. Federal, Total |  |  |  |  | 1 | (16)
U.S. State: |  |  |  |  |  |
Current |  |  |  |  |  | (1)
U.S. State, Total |  |  |  |  |  | (1)
Foreign |  |  |  |  |  |
Current |  |  |  | $ 1 | 3 | 5
Deferred |  |  |  | $ (1) |  | (4)
Foreign, Total |  |  |  |  | 3 | 1
Income tax provision (benefit) | $ 23 | $ (15) | $ (4) |  | $ 4 | $ (16)

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