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Supplementary Information - Cash Paid (Refunded) for Interest and Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting [Abstract]      
Interest $ 558 $ 592 $ 572
Income tax $ 739 $ 628 $ (44)