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Other Expenses, Net - Summary of Other Expenses (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Material income and expense [abstract]      
Property damages and natural disasters $ 11 $ 55 $ 56
Impairment losses of goodwill 1,020    
Impairment losses of other intangible assets 194   9
Impairment losses of fixed assets $ 306 $ 64 23
Losses in the valuation of assets held for sale     $ 22