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
Mar. 31, 2014
Mar. 31, 2013
U.S. Pension Benefits
    
Net Periodic Cost:    
Service cost $ 284 $ 338
Interest cost 401 362
Expected return on assets (564) (537)
Amortization of:    
Transition obligation 0 0
Other net (gain) loss 0 0
Prior service cost 42 43
Actuarial (gain) loss 0 0
Net periodic benefit cost 163 206
U.S. Postretirement Medical Benefits
    
Net Periodic Cost:    
Service cost 21 26
Interest cost 52 46
Expected return on assets (6) (8)
Amortization of:    
Transition obligation 0 0
Other net (gain) loss 0 0
Prior service cost 1 1
Actuarial (gain) loss 0 0
Net periodic benefit cost 68 65
International Pension Benefits
    
Net Periodic Cost:    
Service cost 12 15
Interest cost 12 11
Expected return on assets (15) (14)
Amortization of:    
Transition obligation 0 0
Other net (gain) loss 0 0
Prior service cost 0 0
Actuarial (gain) loss 0 0
Net periodic benefit cost $ 9 $ 12