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Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Pension Plan | U.S. Pension Benefits    
Net Periodic Cost:    
Service cost $ 359 $ 416
Interest cost 517 449
Expected return on assets (782) (801)
Amortization of prior service cost 54 49
Net periodic benefit cost 148 113
Defined Benefit Pension Plan | International Pension Benefits    
Net Periodic Cost:    
Service cost 14 16
Interest cost 12 12
Expected return on assets (19) (20)
Amortization of prior service cost 0 0
Net periodic benefit cost 7 8
U.S. Postretirement Medical Benefits    
Net Periodic Cost:    
Service cost 6 7
Interest cost 27 26
Expected return on assets (2) (2)
Amortization of prior service cost 2 2
Net periodic benefit cost $ 33 $ 33