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Income Taxes - Schedule of Deferred Tax Assets and Liabilities By Report Caption (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Deferred Tax Assets Liabilities Net [Line Items] |  |
Long-term assets-deferred income taxes | $ 368 | $ 574
Long-term liabilities-deferred income taxes | (2,140) | (3,277)
Deferred tax assets liabilities net | $ (1,772) | $ (2,703)

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