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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Pension Plan | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 463 $ 360 $ 927 $ 719
Interest cost 494 517 988 1,034
Expected return on assets (887) (783) (1,775) (1,565)
Amortization of prior service cost 54 55 109 109
Net periodic benefit cost 124 149 249 297
Defined Benefit Pension Plan | International Pension Benefits        
Net Periodic Cost:        
Service cost 17 14 33 28
Interest cost 10 11 20 23
Expected return on assets (21) (19) (42) (38)
Amortization of prior service cost 1 1 1 1
Net periodic benefit cost 7 7 12 14
U.S. Postretirement Medical Benefits | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost 8 6 15 12
Interest cost 22 27 45 54
Expected return on assets (2) (2) (4) (4)
Amortization of prior service cost 2 1 4 3
Net periodic benefit cost $ 30 $ 32 $ 60 $ 65