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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
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)