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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
U.S. Pension Benefits
        
Net Periodic Cost:        
Service cost $ 337 $ 250 $ 675 $ 499
Interest cost 363 352 725 705
Expected return on assets (537) (493) (1,074) (985)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost 43 44 86 87
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost 206 153 412 306
U.S. Postretirement Medical Benefits
        
Net Periodic Cost:        
Service cost 26 22 52 44
Interest cost 47 52 93 104
Expected return on assets (9) (5) (17) (9)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost 1 1 2 2
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost 65 70 130 141
International Pension Benefits
        
Net Periodic Cost:        
Service cost 11 14 26 29
Interest cost 11 10 22 21
Expected return on assets (14) (12) (28) (24)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost 0 0 0 0
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost $ 8 $ 12 $ 20 $ 26