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Operating Expenses, Depreciation and Amortization - Summary of Consolidated Operating Expense (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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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.

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