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Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 10 $ 14 $ 22 $ 27
Interest cost 16 15 31 31
Expected return on plan assets (25) (24) (50) (48)
Net loss from experience differences 9 9 17 18
Prior service cost/(credit)   1 1 1
Settlement losses/(gains) and other expenses 18 12 21 16
Net periodic benefit cost 28 27 42 45
Non-U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 38 39 77 77
Interest cost 49 62 97 122
Expected return on plan assets (108) (111) (212) (221)
Net loss from experience differences 40 31 81 62
Prior service cost/(credit)   (1) (1) (2)
Settlement losses/(gains) and other expenses 1 (1) 2 (1)
Net periodic benefit cost $ 20 $ 19 $ 44 $ 37