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EMPLOYEE BENEFIT PLANS - Net Periodic Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Benefits        
Defined Benefit Plan Disclosure        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 201 213 402 426
Expected return on plan assets (263) (264) (526) (528)
Amortization of prior service credit 0 0 0 0
Recognized net actuarial loss 62 60 124 119
Net periodic cost 0 9 0 17
Other Postretirement and Postemployment Benefits        
Defined Benefit Plan Disclosure        
Service cost 23 18 46 36
Interest cost 45 50 91 100
Expected return on plan assets (1) 0 (1) 0
Amortization of prior service credit (1) (1) (2) (3)
Recognized net actuarial loss 5 3 9 6
Net periodic cost $ 71 $ 70 $ 143 $ 139