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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive (loss) income $ (14) $ (6) $ (12)
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial (gain) loss arising during the year (2) (7)  
Amortization of loss included in net periodic benefit cost (1) (1) (1)
Prior service (credit) cost arising during the year 0 0  
Recognition of gain due to curtailment 1 0  
Foreign currency exchange (1) 2  
Total recognized in other comprehensive (loss) income (3) (6)  
Postemployment      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial (gain) loss arising during the year 12 13  
Amortization of loss included in net periodic benefit cost (4) (2) $ (1)
Prior service (credit) cost arising during the year 0 (1)  
Recognition of gain due to curtailment 0 0  
Foreign currency exchange 0 0  
Total recognized in other comprehensive (loss) income $ 8 $ 10