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Accumulated Other Comprehensive Income (Loss) - Reclassifications from AOCL to Results of Operations (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income (loss) before income taxes | $ (1,006) | $ (852) | $ (7,992)
Reclassification out of accumulated other comprehensive income | Pension and postretirement benefit plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income (loss) before income taxes | 72 | 9 | 16
Reclassification out of accumulated other comprehensive income | Derivative financial instruments for effective cash flow hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income (loss) before income taxes | $ (6) | $ (7) | $ 43

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