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SIGNIFICANT ACCOUNTING MATTERS - Reconciliation of Cash (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Significant Accounting Matters [Line Items]
Cash and Cash Equivalents	$ 1,067.7	$ 202.9
Restricted Cash	39.1	43.1
Total Cash, Cash Equivalents and Restricted Cash	1,106.8	246.0	$ 299.2	$ 379.0
AEP Texas
Significant Accounting Matters [Line Items]
Cash and Cash Equivalents	0.1	0.1
Restricted Cash	7.3	23.5
Total Cash, Cash Equivalents and Restricted Cash	7.4	23.6	45.2	34.1
APCo
Significant Accounting Matters [Line Items]
Cash and Cash Equivalents	3.9	3.9
Restricted Cash	10.8	16.2
Total Cash, Cash Equivalents and Restricted Cash	14.7	20.1	14.8	19.9
SWEPCo
Significant Accounting Matters [Line Items]
Cash and Cash Equivalents	2.7	1.2
Restricted Cash	7.8	3.4
Total Cash, Cash Equivalents and Restricted Cash	$ 10.5	$ 4.6	$ 4.4	$ 2.4

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Amount of cash and cash equivalent, and cash and cash equivalent restricted to withdrawal or usage; attributable to continuing operation. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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Amount of cash and cash equivalent restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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