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Income Taxes - Difference Between Effective Tax Rate (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Income tax provision (benefit) at federal statutory rate | $ 12 | $ (18) | $ (81)
Foreign tax rate differential | 2 | (2) | 2
State income tax provision (benefit), net of federal benefit | 3 | (5) | (3)
Nondeductible expenses | 9 | 2 | 8
Foreign tax credits | 21 | (31) | (2)
Benefit of net operating loss | (14) |  |
One-time transition tax | 1 | 33 |
U.S. tax rate change |  | 69 |
Change in valuation allowance | (28) | (45) | 78
Change in contingency reserve and other |  | $ (3) | 2
Income tax provision (benefit) | $ 6 |  | $ 4
Effective tax rate | 10.70% | 0.00% | (1.60%)

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