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Stockholders' Equity - Summary of Other Equity Reserves (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 26, 2020
Disclosure of reserves within equity [abstract]        
Cumulative translation effect, net of effects from perpetual debentures and deferred income taxes recognized directly in equity (notes 19.2 and 20.4) $ (1,567) $ (2,098)    
Cumulative actuarial losses (792) (593)    
Treasury shares repurchased under share repurchase program (note 20.1) (83) (50) $ (75)  
Effects associated with the Parent Company's convertible securities 0 25    
Treasury shares held by subsidiaries (11) (8)   $ (83)
Other equity reserves $ (2,453) $ (2,724)