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Operating Expenses, Depreciation and Amortization - Summary of Consolidated Operating Expense (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Expense [Line items]      
Administrative expenses [1] $ 1,076 $ 1,112 $ 1,130
R&D activities by internal areas [member]      
Operating Expense [Line items]      
Administrative expenses $ 31 $ 38 $ 39
[1] All significant R&D activities are executed by several internal areas as part of their daily activities. In 2020, 2019 and 2018, total combined expenses of these departments recognized within administrative expenses were $31, $38 and $39, respectively.