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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)