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Employee Benefit Plans - Schedule of Pension and Postemployment Benefit Costs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 8 $ 9 $ 8
Interest cost 3 3 3
Expected return on plan assets (2) (2) (2)
Settlement charge 0 0 1
Curtailment charge (1) 0 0
Amortization of actuarial loss 1 1 1
Amortization of prior service (credit) cost 0 (1) 0
Divestiture 0 0 (2)
Total costs 9 10 9
Postemployment      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 8 7 6
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 4 2 1
Amortization of prior service (credit) cost 0 1 2
Divestiture 0 0 (1)
Total costs $ 13 $ 11 $ 9