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Employee Benefit Plans - Schedule of Pension and Postemployment Benefit Costs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 7 $ 7 $ 8
Interest cost 2 3 3
Expected return on plan assets (2) (2) (2)
Settlement charge 1 0 0
Curtailment charge 0 0 (1)
Amortization of actuarial loss 2 1 1
Total costs 10 9 9
Postemployment      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 11 11 8
Interest cost 1 1 1
Expected return on plan assets 0 0 0
Settlement charge 0 0 0
Curtailment charge 0 0 0
Amortization of actuarial loss 7 5 4
Total costs $ 19 $ 17 $ 13