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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension Benefits    
Defined Benefit Plan Disclosure    
Service cost $ 3 $ 0
Interest cost 201 213
Expected return on plan assets (263) (264)
Amortization of prior service credit 0 0
Recognized net actuarial loss 62 60
Net periodic cost 3 9
Other Postretirement and Postemployment Benefits    
Defined Benefit Plan Disclosure    
Service cost 23 18
Interest cost 45 50
Expected return on plan assets (1) 0
Amortization of prior service credit (1) (1)
Recognized net actuarial loss 5 3
Net periodic cost $ 71 $ 70