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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension      
Total recognized in other comprehensive income (loss) $ (12) $ (9) $ (29)
Postemployment      
Actuarial loss (gain) arising during the year 4 18  
Amortization of loss included in net periodic benefit cost (1) 0 1
Prior service cost arising during the year 2 0  
Total recognized in other comprehensive income (loss) 5 18  
Foreign Pension Plan      
Pension      
Actuarial loss (gain) arising during the year 5 (9)  
Amortization of loss included in net periodic benefit cost (1) (2) (2)
Prior service cost arising during the year 0 0  
Recognition of loss due to settlement (1) (1) $ (1)
Foreign currency exchange (1) 0  
Total recognized in other comprehensive income (loss) $ 2 $ (12)