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Employee Benefit Plans - Pre-tax Net Changes in Projected Benefit Obligations Recognized in Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive income (loss) $ (15) $ (37) $ (14)
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss arising during the year 7 15  
Amortization of loss included in net periodic benefit cost (2) (1) (1)
Recognition of loss due to curtailment (5) 0  
Recognition of loss due to settlement (2) 0  
Foreign currency exchange 3 0  
Total recognized in other comprehensive income (loss) 1 14  
Postemployment      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss arising during the year 15 21  
Amortization of loss included in net periodic benefit cost (7) (5) $ (4)
Recognition of loss due to curtailment 0 0  
Recognition of loss due to settlement 0 0  
Foreign currency exchange 0 0  
Total recognized in other comprehensive income (loss) $ 8 $ 16