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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Pension Plan | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 442 $ 463 $ 1,456 $ 1,390
Interest cost 490 495 1,459 1,483
Expected return on assets (825) (887) (2,502) (2,662)
Amortization of prior service cost 36 55 103 164
Actuarial (gain) loss     (3,290) 0
Net periodic benefit cost 143 126 (2,774) 375
Defined Benefit Pension Plan | International Pension Benefits        
Net Periodic Cost:        
Service cost 19 17 57 50
Interest cost 9 10 29 30
Expected return on assets (17) (22) (51) (64)
Amortization of prior service cost 0 0 1 1
Actuarial (gain) loss     0 0
Net periodic benefit cost 11 5 36 17
U.S. Postretirement Medical Benefits | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost 7 7 21 22
Interest cost 21 23 60 68
Expected return on assets (1) (2) (4) (6)
Amortization of prior service cost 2 1 5 5
Actuarial (gain) loss     0 0
Net periodic benefit cost 29 $ 29 82 $ 89
Estimated future employer contributions to defined benefit plan, current fiscal year $ 21,000   $ 21,000