DERIVATIVES AND HEDGING - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash collateral received from third-parties	$ 119,000	$ 87,000
Cash collateral paid	21,000	3,000
Fair value of derivative liabilities subject to cross acceleration provisions	68,000	72,000
Fair value of derivative liabilities subject to cross default provisions	163,000	164,000
I&M
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash collateral paid	18,000	$ 600
APCo
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of derivative liabilities subject to cross default provisions	1,000
PSO
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of derivative liabilities subject to cross default provisions	4,000
SWEPCo
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of derivative liabilities subject to cross default provisions	$ 2,000
Commodity
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Maximum length of time to hedge exposure to variability	10 years
Cross acceleration provisions maximum third party obligation amount	$ 50,000
Cross default provisions maximum third party obligation amount	$ 50,000