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LONG-TERM DEBT - Schedule of Debt Outstanding and Borrowing Capacity (Details) - Line of Credit - USD ($)
$ in Millions
Nov. 06, 2025
Sep. 30, 2025
Dec. 31, 2024
Revolving credit facility and Letters of credit      
LONG-TERM DEBT      
Available borrowing capacity   $ 2,148 $ 1,748
Total aggregate elected commitments   2,500 2,200
Revolving credit facility and Letters of credit | Subsequent Event      
LONG-TERM DEBT      
Available borrowing capacity $ 2,318    
Total aggregate elected commitments 2,500    
Outstanding balance      
LONG-TERM DEBT      
Credit facility outstanding   350 450
Outstanding balance | Subsequent Event      
LONG-TERM DEBT      
Credit facility outstanding 180    
Letters of credit      
LONG-TERM DEBT      
Credit facility outstanding   $ 2 $ 2
Letters of credit | Subsequent Event      
LONG-TERM DEBT      
Credit facility outstanding $ 2