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
Mar. 31, 2020
Mar. 31, 2019
Defined Benefit Pension Plan | U.S. Pension Benefits    
Net Periodic Cost:    
Service cost $ 464 $ 359
Interest cost 494 517
Expected return on assets (888) (782)
Amortization of prior service cost 55 54
Net periodic benefit cost 125 148
Defined Benefit Pension Plan | International Pension Benefits    
Net Periodic Cost:    
Service cost 16 14
Interest cost 10 12
Expected return on assets (21) (19)
Amortization of prior service cost 0 0
Net periodic benefit cost 5 7
U.S. Postretirement Medical Benefits | U.S. Pension Benefits    
Net Periodic Cost:    
Service cost 7 6
Interest cost 23 27
Expected return on assets (2) (2)
Amortization of prior service cost 2 2
Net periodic benefit cost $ 30 $ 33