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SUPPLEMENTAL ACCOUNT BALANCES - Other Noncurrent Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
SUPPLEMENTAL INFORMATION [Abstract]    
Operating lease right-of-use assets $ 83 $ 73
Deferred financing costs - Revolving Credit Facility 12 11
Emission reduction credits 11 11
Prepaid power plant maintenance 2 34
Fair value of commodity derivative contracts 0 6
Deposits and other 14 13
Other noncurrent assets $ 122 $ 148