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Operating Expenses, Depreciation and Amortization - Summary of Consolidated Operating Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]      
Administrative expenses [1] $ 1,076 $ 1,112 $ 1,130
Selling expenses 337 371 312
Distribution and logistics expenses 1,423 1,489 1,537
Operating expenses $ 2,836 $ 2,972 $ 2,979
[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.