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Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Equity [Abstract] |  |  |  |
Pension and postretirement benefit plans, pretax expense | $ 6,000,000 | $ 2,000,000 | $ 17,000,000 | $ 6,000,000
Reclassifications from AOCL, pretax expense (income) | $ (6,000,000) | $ 0 | $ (5,000,000) | $ (5,000,000)

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