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Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 13 $ 17
Interest cost 16 17
Expected return on plan assets (24) (23)
Net loss from experience differences 9 12
Settlement losses and other expenses 4 3
Net periodic pension cost 18 26
Non-U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 38 50
Interest cost 60 77
Expected return on plan assets (110) (119)
Net loss from experience differences 31 39
Prior service cost (1)  
Net periodic pension cost $ 18 $ 47