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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Pension Plan | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 360 $ 415 $ 1,079 $ 1,246
Interest cost 516 450 1,550 1,349
Expected return on assets (782) (800) (2,347) (2,401)
Amortization of prior service cost 55 48 164 145
Net periodic benefit cost 149 113 446 339
Defined Benefit Pension Plan | International Pension Benefits        
Net Periodic Cost:        
Service cost 15 15 43 47
Interest cost 12 11 35 34
Expected return on assets (19) (19) (57) (58)
Amortization of prior service cost 0 0 1 0
Net periodic benefit cost 8 7 22 23
U.S. Postretirement Medical Benefits | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost 6 7 18 21
Interest cost 27 26 81 78
Expected return on assets (2) (2) (6) (6)
Amortization of prior service cost 2 2 5 6
Net periodic benefit cost $ 33 $ 33 $ 98 $ 99