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Retirement Plans - Schedule of Net Periodic Pension Cost and Other Comprehensive Income (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Interest cost $ 6 $ 7 $ 6
Expected return on plan assets (11) (11) (9)
Actuarial loss amortization 2 2 2
Total pension income (3) (2) (1)
Current year actuarial loss 6 3 2
Amortization of actuarial loss (2) (2) (2)
Total amount recognized in other comprehensive income 4 1 0
Total amount recognized in net periodic benefit cost and other comprehensive income $ 1 $ (1) $ (1)