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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
U.S. Pension Benefits
        
Net Periodic Cost:        
Service cost $ 250 $ 218 $ 499 $ 436
Interest cost 352 327 705 654
Expected return on assets (493) (489) (985) (978)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 29 0 59
Prior service cost 44 43 87 86
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost 153 128 306 257
U.S. Postretirement Medical Benefits
        
Net Periodic Cost:        
Service cost 22 22 44 44
Interest cost 52 52 104 104
Expected return on assets (5) (4) (9) (8)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost 1 2 2 4
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost 70 72 141 144
International Pension Benefits
        
Net Periodic Cost:        
Service cost 14 9 29 18
Interest cost 10 10 21 20
Expected return on assets (12) (11) (24) (22)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 1 0 2
Prior service cost 0 0 0 0
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost $ 12 $ 9 $ 26 $ 18