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Changes in Accumulated Postemployment benefit Obligations (Detail) - Postemployment Benefit Plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Accrued benefit obligation at January 1 $ 94 $ 103  
Service cost 7 9 $ 8
Interest cost 5 6 5
Benefits paid (7) (17)  
Assumption changes (3) 2  
Actuarial losses (1) (9)  
Accrued benefit obligation at December 31 $ 95 $ 94 $ 103