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Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
U.S. Pension Benefits    
Net Periodic Cost:    
Service cost $ 352 $ 382
Interest cost 457 423
Expected return on assets (629) (622)
Amortization of:    
Prior service cost 42 42
Net periodic benefit cost 222 225
U.S. Postretirement Medical Benefits    
Net Periodic Cost:    
Service cost 7 9
Interest cost 30 31
Expected return on assets (1) (4)
Amortization of:    
Prior service cost 1 1
Net periodic benefit cost 37 37
International Pension Benefits    
Net Periodic Cost:    
Service cost 12 12
Interest cost 10 11
Expected return on assets (14) (15)
Amortization of:    
Prior service cost 0 0
Net periodic benefit cost $ 8 $ 8