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Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Equity [Abstract] |  |  |  |
Pension and postretirement benefit plans, pretax expense | $ 5 | $ 2 | $ 11 | $ 4
Reclassifications from AOCL, pretax expense (income) | $ 0 | $ (1) | $ 1 | $ (5)

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