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Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 12 $ 13
Interest cost 15 16
Expected return on plan assets (25) (24)
Net loss from experience differences 8 9
Prior service cost/(credit) 1  
Settlement losses and other expenses 3 4
Net periodic benefit cost 14 18
Non-U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 39 38
Interest cost 48 60
Expected return on plan assets (104) (110)
Net loss from experience differences 41 31
Prior service cost/(credit) (1) (1)
Settlement losses and other expenses 1  
Net periodic benefit cost $ 24 $ 18