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Employee Benefit Plans Schedule of Pension and Postemployment Benefit Costs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 9 $ 8 $ 8
Interest cost 3 3 3
Expected return on plan assets (2) (2) (2)
Settlement charge 0 1 1
Amortization of actuarial loss 1 1 2
Amortization of prior service (credit) cost (1) 0 0
Divestiture 0 (2) 0
Total costs 10 9 12
Postemployment Retirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 7 6 6
Interest cost 1 1 1
Expected return on plan assets 0 0 0
Settlement charge 0 0 0
Amortization of actuarial loss 2 1 0
Amortization of prior service (credit) cost 1 2 0
Divestiture 0 (1) 0
Total costs $ 11 $ 9 $ 7