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Income Taxes - Net Deferred Tax Liabilities Presented on Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Long-term deferred tax assets | $ 236 | $ 268
Long-term deferred tax liabilities | (323) | (293)
Net deferred tax liabilities | $ (87) | $ (25)

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