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PENSION AND OTHER POSTEMPLOYMENT BENEFITS - Schedule of Assumed Rate of Return on Pension Plan Assets Considers Historical Market Returns and Economic Forecasts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pensions and OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Actual gains or (losses) on plan assets - $ millions $ 3 $ 751 $ (1,830)
Actual gains or (losses) on plan assets - % 0.70% 11.20% (19.10%)
Expected return on plan assets - $ millions $ 565 $ 601 $ 696
Expected return on plan assets     7.50%
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Actual gains or (losses) on plan assets - $ millions (62) 682  
Expected return on plan assets - $ millions $ 530 $ 570 $ 657
Expected return on plan assets 8.00% 8.00% 7.50%
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Actual gains or (losses) on plan assets - $ millions $ 65 $ 69  
Expected return on plan assets - $ millions $ 35 $ 31 $ 39
Expected return on plan assets 7.00% 7.00% 7.50%