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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Pension Plan | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 461 $ 463 $ 1,014 $ 927
Interest cost 481 494 969 988
Expected return on assets (831) (887) (1,677) (1,775)
Amortization of prior service cost 34 54 67 109
Actuarial (gain) loss     (3,290) 0
Net periodic benefit cost 145 124 (2,917) 249
Estimated future employer contributions to defined benefit plan, current fiscal year 31,000   31,000  
Defined Benefit Pension Plan | International Pension Benefits        
Net Periodic Cost:        
Service cost 19 17 38 33
Interest cost 10 10 20 20
Expected return on assets (17) (21) (34) (42)
Amortization of prior service cost 1 1 1 1
Actuarial (gain) loss     0 0
Net periodic benefit cost 13 7 25 12
U.S. Postretirement Medical Benefits | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost 7 8 14 15
Interest cost 20 22 39 45
Expected return on assets (1) (2) (3) (4)
Amortization of prior service cost 1 2 3 4
Actuarial (gain) loss     0 0
Net periodic benefit cost 27 $ 30 53 $ 60
Estimated future employer contributions to defined benefit plan, current fiscal year $ 43,000   $ 43,000