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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive (loss) income $ (6) $ (12) $ (9)
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial (gain) loss arising during the year (7) 5  
Amortization of loss included in net periodic benefit cost (1) (1) (2)
Prior service (credit) cost arising during the year 0 0  
Recognition of loss due to settlement 0 (1) (1)
Foreign currency exchange 2 (1)  
Total recognized in other comprehensive (loss) income (6) 2  
Postemployment Retirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial (gain) loss arising during the year 13 4  
Amortization of loss included in net periodic benefit cost (2) (1) 0
Prior service (credit) cost arising during the year (1) 2  
Recognition of loss due to settlement 0 0 $ 0
Foreign currency exchange 0 0  
Total recognized in other comprehensive (loss) income $ 10 $ 5