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, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
U.S. Pension Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 218 $ 181 $ 654 $ 542
Interest cost 327 300 981 899
Expected return on assets (489) (400) (1,467) (1,199)
Amortization of:        
Transition obligation        
Prior service cost 43 43 129 129
Actuarial (gain) loss 71 19 213 58
Settlements / curtailments        
Net periodic benefit cost 170 143 510 429
U.S. Postretirement Medical Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 22 22 66 65
Interest cost 52 53 156 160
Expected return on assets (4) (5) (12) (16)
Amortization of:        
Transition obligation        
Prior service cost 2 1 6 3
Actuarial (gain) loss 5 4 15 12
Settlements / curtailments        
Net periodic benefit cost 77 75 231 224
International Pension Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 9 6 27 18
Interest cost 10 9 30 26
Expected return on assets (11) (10) (33) (27)
Amortization of:        
Transition obligation        
Actuarial (gain) loss 1 1 3 2
Settlements / curtailments        
Net periodic benefit cost $ 9 $ 6 $ 27 $ 19