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EMPLOYEE BENEFIT PLANS - Components of Net Periodic (Benefit) Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension Benefits        
Defined Benefit Plan Disclosure        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 213 153 426 306
Expected return on plan assets (264) (330) (528) (660)
Amortization of prior service credit 0 0 0 0
Recognized net actuarial loss 60 64 119 127
Net periodic cost (benefit) 9 (113) 17 (227)
Other Postretirement and Postemployment Benefits        
Defined Benefit Plan Disclosure        
Service cost 18 18 36 35
Interest cost 50 32 100 64
Expected return on plan assets 0 (4) 0 (8)
Amortization of prior service credit (1) (1) (3) (3)
Recognized net actuarial loss 3 13 6 28
Net periodic cost (benefit) $ 70 $ 58 $ 139 $ 116