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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
U.S. Pension Benefits
       
Net Periodic Cost:        
Service cost $ 285 $ 337 $ 569 $ 675
Interest cost 401 363 802 725
Expected return on assets (565) (537) (1,129) (1,074)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost 43 43 85 86
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost 164 206 327 412
U.S. Postretirement Medical Benefits
       
Net Periodic Cost:        
Service cost 18 26 39 52
Interest cost 34 47 86 93
Expected return on assets (6) (9) (12) (17)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost (4) 1 (3) 2
Actuarial (gain) loss 746 0 746 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 320   320  
Net periodic benefit cost 1,108 65 1,176 130
International Pension Benefits
       
Net Periodic Cost:        
Service cost 15 11 27 26
Interest cost 14 11 26 22
Expected return on assets (15) (14) (30) (28)
Amortization of:        
Transition obligation 0 0 0 0
Other net (gain) loss 0 0 0 0
Prior service cost (3) 0 (3) 0
Actuarial (gain) loss 0 0 0 0
Net periodic benefit cost $ 11 $ 8 $ 20 $ 20