Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail)

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EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Pension Plan | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 463 $ 360 $ 1,390 $ 1,079
Interest cost 495 516 1,483 1,550
Expected return on assets (887) (782) (2,662) (2,347)
Amortization of prior service cost 55 55 164 164
Net periodic benefit cost 126 149 375 446
Defined Benefit Pension Plan | International Pension Benefits        
Net Periodic Cost:        
Service cost 17 15 50 43
Interest cost 10 12 30 35
Expected return on assets (22) (19) (64) (57)
Amortization of prior service cost 0 0 1 1
Net periodic benefit cost 5 8 17 22
U.S. Postretirement Medical Benefits | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost 7 6 22 18
Interest cost 23 27 68 81
Expected return on assets (2) (2) (6) (6)
Amortization of prior service cost 1 2 5 5
Net periodic benefit cost $ 29 $ 33 $ 89 $ 98