Quarterly report pursuant to Section 13 or 15(d)

Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail)

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Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (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 Benefits        
Net Periodic Cost:        
Service cost $ 389 $ 353 $ 779 $ 706
Interest cost 462 457 924 914
Expected return on assets (712) (629) (1,424) (1,258)
Amortization of:        
Prior service cost 48 42 96 84
Net periodic benefit cost 187 223 375 446
U.S. Postretirement Medical Benefits        
Net Periodic Cost:        
Service cost 7 7 14 14
Interest cost 28 30 56 60
Expected return on assets (1) (1) (3) (2)
Amortization of:        
Prior service cost 2 1 4 2
Net periodic benefit cost 36 37 71 74
International Pension Benefits        
Net Periodic Cost:        
Service cost 14 13 29 25
Interest cost 10 11 20 21
Expected return on assets (16) (15) (32) (29)
Amortization of:        
Prior service cost 0 0 0 0
Net periodic benefit cost $ 8 $ 9 $ 17 $ 17