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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 382 $ 284 $ 1,145 $ 853
Interest cost 423 401 1,270 1,203
Expected return on assets (622) (564) (1,866) (1,693)
Amortization of:        
Transition obligation 0 0 0 0
Prior service cost 42 42 126 127
Other net (gain) loss 0 0 0 0
Actuarial (gain) loss 0 0 0 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0 0 0
Net periodic benefit cost 225 163 675 490
U.S. Postretirement Medical Benefits        
Net Periodic Cost:        
Service cost 8 12 25 51
Interest cost 30 33 91 119
Expected return on assets (5) (6) (13) (18)
Amortization of:        
Transition obligation 0 0 0 0
Prior service cost 2 1 4 (2)
Other net (gain) loss 0 0 0 0
Actuarial (gain) loss 0 0 0 746
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0 0 320
Net periodic benefit cost 35 40 107 1,216
International Pension Benefits        
Net Periodic Cost:        
Service cost 12 10 37 37
Interest cost 11 12 33 38
Expected return on assets (15) (15) (46) (45)
Amortization of:        
Transition obligation 0 0 0 0
Prior service cost 0 1 1 (2)
Other net (gain) loss 0 0 0 0
Actuarial (gain) loss 0 0 0 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0 0 0
Net periodic benefit cost $ 8 $ 8 $ 25 $ 28