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Supplementary Information - Cash Paid (Refunded) for Interest and Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting [Abstract]      
Interest $ 592 $ 572 $ 599
Income tax $ 628 $ (44) $ 750