FINANCING ACTIVITIES - Schedule of Long-Term Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
2025	$ 3,335.0
2026	1,864.4
2027	2,283.6
2028	2,592.0
2029	2,694.0
2029	30,212.8
Principal Amount	42,981.8
Unamortized Discount, Net and Debt Issuance Costs	(339.0)
Total Long-term Debt Outstanding	42,642.8	$ 40,143.2
AEP TEXAS INC.
Debt Instrument [Line Items]
2025	324.5
2026	75.0
2027	25.6
2028	526.2
2029	627.4
2029	4,912.8
Principal Amount	6,491.5
Unamortized Discount, Net and Debt Issuance Costs	(49.9)
Total Long-term Debt Outstanding	6,441.6	5,889.8
AEP TRANSMISSION COMPANY, LLC
Debt Instrument [Line Items]
2025	90.0
2026	425.0
2027	0.0
2028	60.0
2029	55.0
2029	5,201.0
Principal Amount	5,831.0
Unamortized Discount, Net and Debt Issuance Costs	(62.9)
Total Long-term Debt Outstanding	5,768.1	5,414.4
APPALACHIAN POWER COMPANY
Debt Instrument [Line Items]
2025	798.6
2026	30.9
2027	355.6
2028	117.8
2029	0.0
2029	4,400.0
Principal Amount	5,702.9
Unamortized Discount, Net and Debt Issuance Costs	(42.6)
Total Long-term Debt Outstanding	5,660.3	5,588.3
INDIANA MICHIGAN POWER COMPANY
Debt Instrument [Line Items]
2025	269.2
2026	43.6
2027	13.7
2028	356.5
2029	0.0
2029	2,841.3
Principal Amount	3,524.3
Unamortized Discount, Net and Debt Issuance Costs	(30.0)
Total Long-term Debt Outstanding	3,494.3	3,499.4
OHIO POWER COMPANY
Debt Instrument [Line Items]
2025	0.0
2026	0.0
2027	0.0
2028	0.0
2029	0.0
2029	3,750.0
Principal Amount	3,750.0
Unamortized Discount, Net and Debt Issuance Costs	(34.3)
Total Long-term Debt Outstanding	3,715.7	3,366.8
PUBLIC SERVICE COMPANY OF OKLAHOMA
Debt Instrument [Line Items]
2025	125.6
2026	50.6
2027	0.3
2028	0.0
2029	100.0
2029	2,600.0
Principal Amount	2,876.5
Unamortized Discount, Net and Debt Issuance Costs	(20.9)
Total Long-term Debt Outstanding	2,855.6	2,384.6
SOUTHWESTERN ELECTRIC POWER COMPANY
Debt Instrument [Line Items]
2025	22.7
2026	916.6
2027	17.4
2028	593.3
2029	19.2
2029	2,442.4
Principal Amount	4,011.6
Unamortized Discount, Net and Debt Issuance Costs	(30.8)
Total Long-term Debt Outstanding	$ 3,980.8	$ 3,646.9

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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