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Components of Net Periodic Pension Cost (Detail) - Pension Plans - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 12 $ 15 $ 34 $ 42
Interest cost 16 15 47 46
Expected return on plan assets (25) (24) (75) (72)
Net loss from experience differences 10 12 27 30
Prior service cost/(credit)     1 1
Settlement losses/(gains) and other expenses 6 9 27 25
Net periodic benefit cost 19 27 61 72
Non-U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 40 37 117 114
Interest cost 51 57 148 179
Expected return on plan assets (110) (105) (322) (326)
Net loss from experience differences 43 31 124 93
Prior service cost/(credit) (1)   (2) (2)
Settlement losses/(gains) and other expenses     2 (1)
Net periodic benefit cost $ 23 $ 20 $ 67 $ 57