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EMPLOYEE BENEFIT PLANS - Components of Net Periodic (Benefit) Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension Benefits        
Defined Benefit Plan Disclosure        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 213 153 638 459
Expected return on plan assets (264) (330) (791) (990)
Amortization of prior service credit 0 0 0 0
Recognized net actuarial loss 60 64 179 191
Net periodic cost (benefit) 9 (113) 26 (340)
Other Postretirement and Postemployment Benefits        
Defined Benefit Plan Disclosure        
Service cost 18 18 54 53
Interest cost 50 32 150 96
Expected return on plan assets 0 (4) (1) (12)
Amortization of prior service credit (1) (1) (4) (4)
Recognized net actuarial loss 3 13 10 41
Net periodic cost (benefit) $ 70 $ 58 $ 209 $ 174