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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 353 $ 382 $ 1,059 $ 1,145
Interest cost 457 423 1,371 1,270
Expected return on assets (629) (622) (1,887) (1,866)
Amortization of:        
Prior service cost 41 42 125 126
Net periodic benefit cost 222 225 668 675
U.S. Postretirement Medical Benefits        
Net Periodic Cost:        
Service cost 7 8 21 25
Interest cost 32 30 92 91
Expected return on assets (2) (5) (4) (13)
Amortization of:        
Prior service cost 1 2 3 4
Net periodic benefit cost 38 35 112 107
International Pension Benefits        
Net Periodic Cost:        
Service cost 12 12 37 37
Interest cost 10 11 31 33
Expected return on assets (15) (15) (44) (46)
Amortization of:        
Prior service cost 0 0 0 1
Net periodic benefit cost $ 7 $ 8 $ 24 $ 25