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Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 14 $ 15 $ 27 $ 32
Interest cost 15 17 31 34
Expected return on plan assets (24) (24) (48) (47)
Net loss from experience differences 9 10 18 22
Prior service cost / (credit) 1 1 1 1
Settlement losses / (gains) and other expenses 12 10 16 13
Net periodic pension cost 27 29 45 55
Non-U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 39 51 77 101
Interest cost 62 77 122 154
Expected return on plan assets (111) (119) (221) (238)
Net loss from experience differences 31 38 62 77
Prior service cost / (credit) (1) 16 (2) 16
Settlement losses / (gains) and other expenses (1)   (1)  
Net periodic pension cost $ 19 $ 63 $ 37 $ 110