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Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
U.S. Pension Benefits    
Net Periodic Cost:    
Service cost $ 390 $ 352
Interest cost 462 457
Expected return on assets (712) (629)
Amortization of:    
Prior service cost 48 42
Net periodic benefit cost 188 222
U.S. Postretirement Medical Benefits    
Net Periodic Cost:    
Service cost 7 7
Interest cost 28 30
Expected return on assets (2) (1)
Amortization of:    
Prior service cost 2 1
Net periodic benefit cost 35 37
International Pension Benefits    
Net Periodic Cost:    
Service cost 15 12
Interest cost 10 10
Expected return on assets (16) (14)
Amortization of:    
Prior service cost 0 0
Net periodic benefit cost $ 9 $ 8