Quarterly report pursuant to Section 13 or 15(d)

Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail)

v2.4.0.6
Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
U.S. Pension Benefits
    
Net Periodic Cost:    
Service cost $ 249 $ 218
Interest cost 353 327
Expected return on assets (492) (489)
Amortization of:    
Transition obligation 0 0
Other net (gain) loss 0 30
Prior service cost 43 43
Actuarial (gain) loss 0 0
Net periodic benefit cost 153 129
U.S. Postretirement Medical Benefits
    
Net Periodic Cost:    
Service cost 22 22
Interest cost 52 52
Expected return on assets (4) (4)
Amortization of:    
Transition obligation 0 0
Other net (gain) loss 0 0
Prior service cost 1 2
Actuarial (gain) loss 0 0
Net periodic benefit cost 71 72
International Pension Benefits
    
Net Periodic Cost:    
Service cost 15 9
Interest cost 11 10
Expected return on assets (12) (11)
Amortization of:    
Transition obligation 0 0
Other net (gain) loss 0 1
Prior service cost 0 0
Actuarial (gain) loss 0 0
Net periodic benefit cost $ 14 $ 9