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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]      
Defined contribution plan, employer matching contribution, percent of match 7.00%    
Defined contribution plan, cost   $ 20 $ 61