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Financial Instruments - Summary of Changes in Consolidated Debt (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about financial instruments [abstract] |  |  |
Debt at beginning of year | $ 9,365 | $ 9,311 | $ 9,873
Proceeds from new debt instruments | 4,210 | 3,331 | 2,325
Debt repayments | (4,572) | (3,284) | (2,745)
Foreign currency translation and accretion effects | 336 | 7 | (142)
Debt at end of year | $ 9,339 | $ 9,365 | $ 9,311

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