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SUPPLEMENTAL ACCOUNT BALANCES - Other Noncurrent Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
SUPPLEMENTAL INFORMATION [Abstract]    
Operating lease right-of-use assets $ 105 $ 73
Deferred financing costs - Revolving Credit Facility 23 11
Emission reduction credits 11 11
Prepaid power plant maintenance 5 34
Fair value of commodity derivative contracts 16 6
Funded pension 67 2
All other 45 11
Other noncurrent assets $ 272 $ 148