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Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 15 $ 16 $ 42 $ 48
Interest cost 15 16 46 50
Expected return on plan assets (24) (23) (72) (70)
Net loss from experience differences 12 11 30 33
Prior service cost / (credit)     1 1
Settlement losses / (gains) and other expenses 9 2 25 15
Net periodic pension cost 27 22 72 77
Non-U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 37 44 114 145
Interest cost 57 77 179 231
Expected return on plan assets (105) (120) (326) (358)
Net loss from experience differences 31 33 93 110
Prior service cost / (credit)     (2) 16
Settlement losses / (gains) and other expenses     (1)  
Net periodic pension cost $ 20 $ 34 $ 57 $ 144