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FINANCING ACTIVITIES - Schedule of Accounts Receivable and Accrued Unbilled Revenues (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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APPALACHIAN POWER COMPANY |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | $ 192.7 | $ 184.6
INDIANA MICHIGAN POWER COMPANY |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | 160.5 | 156.4
OHIO POWER COMPANY |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | 470.7 | 541.7
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | 111.4 | 134.6
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | $ 153.5 | $ 168.3

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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477011/948-310-45-1 + Details
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