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PENSION AND OTHER POSTEMPLOYMENT BENEFITS - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
May 12, 2023
USD ($)
Jan. 31, 2025
USD ($)
numberOfEmployee
Dec. 31, 2023
USD ($)
numberOfEmployee
Jun. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
numberOfEmployee
Dec. 31, 2022
USD ($)
Defined Benefit Plan Disclosure [Line Items]              
Defined benefit plan, assumptions used calculating benefit obligation, increase (decrease) in discount rate         0.67%    
Pensions and OPEB              
Defined Benefit Plan Disclosure [Line Items]              
Pension & OPEB mark-to-market         $ 22    
Pensions and OPEB | Integrated              
Defined Benefit Plan Disclosure [Line Items]              
Mark-to-market adjustment, net of capitalized amounts         $ (8) $ 36 $ 15
Pension              
Defined Benefit Plan Disclosure [Line Items]              
Weighted-average discount rate         8.50%    
Expected future contributions         $ 300    
Defined benefit plan, number of covered employees by plan | numberOfEmployee     1,900     1,900  
Defined benefit plan, plan assets pre tax gain     $ 36        
Voluntary cash contribution $ 750            
Pre-tax pension mark-to-market adjustment gain       $ 59 (66) $ (108) 98
Pension | Banner Life Insurance Company and Reinsurance Group of America              
Defined Benefit Plan Disclosure [Line Items]              
Transfer of plan assets     (683)        
Transfer of benefit obligations     $ (719)        
Pension | MetLife | Subsequent Event              
Defined Benefit Plan Disclosure [Line Items]              
Transfer of plan assets   $ 640          
Transfer of benefit obligations   $ 652          
Defined benefit plan, number of covered employees by plan | numberOfEmployee   2,000          
OPEB              
Defined Benefit Plan Disclosure [Line Items]              
Pre-tax pension mark-to-market adjustment gain         $ 44 $ 30 $ (26)