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FINANCING ACTIVITIES - Schedule of Accounts Receivable and Accrued Unbilled Revenues (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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APCo |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | $ 183.0 | $ 192.7
I&M |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | 185.0 | 160.5
OPCo |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | 490.9 | 470.7
PSO |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | 202.5 | 111.4
SWEPCo |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | $ 200.3 | $ 153.5

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- Definition Amount, before valuation allowance, of accounts and financing receivables held for sale. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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