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Other Expenses, Net - Summary of Other Expenses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Material income and expense [abstract]      
Results from the sale of assets and others, net $ (127) $ (230) $ (149)
Restructuring costs (81) (48) (72)
Incremental costs and expenses related to the COVID-19 Pandemic (note 2) (48)    
Impairment losses and remeasurement of assets held for sale (1,520) (64) (62)
Remeasurement of pension liabilities     (8)
Charitable contributions (3) (5) (5)
Other expenses, net $ (1,779) $ (347) $ (296)