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EMPLOYEE BENEFIT PLANS - Benefit Obligations, Fair Value of Plan Assets and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Change in Benefit Obligation      
Benefit obligation at beginning of period $ 15,911 $ 15,811  
Service cost 233 95 $ 0
Interest cost 820 855 611
Actuarial (gain)/loss (738) 351  
Benefits paid, including lump sums and annuities (1,259) (1,201)  
Plan amendments 0 0  
Participant contributions 0 0  
Special termination benefits 0 0 0
Benefit obligation at end of period 14,967 15,911 15,811
Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 15,766 15,721  
Actual gain on plan assets 1,142 1,142  
Employer contributions 256 104  
Participant contributions 0 0  
Benefits paid, including lump sums and annuities (1,259) (1,201)  
Fair value of plan assets at end of period 15,905 15,766 15,721
Funded Status of Plan      
Funded status at end of period 938 (145)  
Other Postretirement and Postemployment Benefits      
Change in Benefit Obligation      
Benefit obligation at beginning of period 3,503 3,664  
Service cost 92 71 70
Interest cost 182 200 128
Actuarial (gain)/loss (50) 24  
Benefits paid, including lump sums and annuities (497) (485)  
Plan amendments 0 11  
Participant contributions 30 18  
Special termination benefits 5 0 0
Benefit obligation at end of period 3,265 3,503 3,664
Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 33 71  
Actual gain on plan assets (7) 3  
Employer contributions 468 426  
Participant contributions 30 18  
Benefits paid, including lump sums and annuities (497) (485)  
Fair value of plan assets at end of period 27 33 $ 71
Funded Status of Plan      
Funded status at end of period $ (3,238) $ (3,470)