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Investments - Company's Combined Proportionate Share of Major Components of Financial Statements (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Current assets $ 13,366 $ 10,745
Current liabilities 9,743 8,529
Net income 677 1,632
Equity Method Investee [Member]    
Schedule of Equity Method Investments [Line Items]    
Current assets 1,510 1,680
Non-current assets 1,748 3,573
Current liabilities 873 1,266
Long-term liabilities 835 994
Sales 3,384 4,142
Cost of goods sold & expenses 3,140 3,949
Net income $ 244 $ 193