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, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
U.S. Pension Benefits
       
Net Periodic Cost:        
Service cost $ 284 $ 337 $ 853 $ 1,012
Interest cost 401 362 1,203 1,087
Expected return on assets (564) (537) (1,693) (1,611)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost 42 44 127 130
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost 163 206 490 618
U.S. Postretirement Medical Benefits
       
Net Periodic Cost:        
Service cost 12 20 51 72
Interest cost 33 46 119 139
Expected return on assets (6) (8) (18) (25)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost 1 1 (2) 3
Actuarial (gain) loss 0 0 746 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0   320  
Net periodic benefit cost 40 59 1,216 189
International Pension Benefits
       
Net Periodic Cost:        
Service cost 10 11 37 37
Interest cost 12 11 38 33
Expected return on assets (15) (14) (45) (42)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost 1 0 (2) 0
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost $ 8 $ 8 $ 28 $ 28