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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

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