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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
U.S. Pension Benefits
        
Net Periodic Cost:        
Service cost $ 249 $ 218 $ 748 $ 654
Interest cost 353 327 1,058 981
Expected return on assets (493) (489) (1,478) (1,467)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 29 0 88
Prior service cost 43 43 130 129
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost 152 128 458 385
U.S. Postretirement Medical Benefits
        
Net Periodic Cost:        
Service cost 23 22 67 66
Interest cost 52 52 156 156
Expected return on assets (4) (4) (13) (12)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost 1 2 3 6
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost 72 72 213 216
International Pension Benefits
        
Net Periodic Cost:        
Service cost 12 9 41 27
Interest cost 10 10 31 30
Expected return on assets (11) (11) (35) (33)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 1 0 3
Prior service cost 1 0 1 0
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost $ 12 $ 9 $ 38 $ 27