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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 381 $ 285 $ 763 $ 569
Interest cost 424 401 847 802
Expected return on assets (622) (565) (1,244) (1,129)
Amortization of:        
Transition obligation 0 0 0 0
Prior service cost 42 43 84 85
Other net (gain) loss 0 0 0 0
Actuarial (gain) loss 0 0 0 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0 0 0
Net periodic benefit cost 225 164 450 327
U.S. Postretirement Medical Benefits        
Net Periodic Cost:        
Service cost 8 18 17 39
Interest cost 30 34 61 86
Expected return on assets (4) (6) (8) (12)
Amortization of:        
Transition obligation 0 0 0 0
Prior service cost 1 (4) 2 (3)
Other net (gain) loss 0 0 0 0
Actuarial (gain) loss 0 746 0 746
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 320 0 320
Net periodic benefit cost 35 1,108 72 1,176
International Pension Benefits        
Net Periodic Cost:        
Service cost 13 15 25 27
Interest cost 11 14 22 26
Expected return on assets (16) (15) (31) (30)
Amortization of:        
Transition obligation 0 0 0 0
Prior service cost 1 (3) 1 (3)
Other net (gain) loss 0 0 0 0
Actuarial (gain) loss 0 0 0 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0 0 0
Net periodic benefit cost $ 9 $ 11 $ 17 $ 20