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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Effective Income Tax Rate Reconciliation [Line Items] |  |
Deferred Tax Assets | $ 2,651.9 | $ 3,216.1
Deferred Tax Liabilities | (12,624.3) | (12,631.8)
Net Deferred Tax Liabilities | (9,972.4) | (9,415.7)
Property Related Temporary Differences | (8,939.7) | (8,809.0)
Amounts Due to Customers for Future Income Taxes | 779.6 | 898.1
Securitized Assets | (133.4) | (81.8)
Regulatory Assets | (966.2) | (825.9)
Accrued Nuclear Decommissioning | (1,052.2) | (923.5)
Net Operating Loss Carryforward | 110.3 | 155.6
Valuation Allowance | (35.0) | (37.4)
Tax Credit Carryforward | 197.5 | 321.4
Operating Lease Liability | 145.3 | 154.7
Investment in Partnership | (302.1) | (296.3)
Net Deferred Tax Liabilities | 223.5 | 28.4
AEP TEXAS INC. |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Deferred Tax Assets | 139.1 | 173.6
Deferred Tax Liabilities | (1,461.8) | (1,401.4)
Net Deferred Tax Liabilities | (1,322.7) | (1,227.8)
Property Related Temporary Differences | (1,364.0) | (1,274.0)
Amounts Due to Customers for Future Income Taxes | 109.3 | 109.3
Securitized Assets | (26.5) | (46.7)
Regulatory Assets | (63.2) | (56.2)
Accrued Nuclear Decommissioning | 0.0 | 0.0
Net Operating Loss Carryforward | 0.0 | 0.0
Valuation Allowance | 0.0 | 0.0
Tax Credit Carryforward | 4.3 | 13.7
Operating Lease Liability | 12.3 | 17.3
Investment in Partnership | 0.0 | 0.0
Net Deferred Tax Liabilities | 5.1 | 8.8
AEP TRANSMISSION COMPANY, LLC |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Deferred Tax Assets | 172.6 | 188.0
Deferred Tax Liabilities | (1,451.2) | (1,335.7)
Net Deferred Tax Liabilities | (1,278.6) | (1,147.7)
Property Related Temporary Differences | (1,416.6) | (1,304.2)
Amounts Due to Customers for Future Income Taxes | 121.4 | 120.8
Securitized Assets | 0.0 | 0.0
Regulatory Assets | (0.2) | (0.7)
Accrued Nuclear Decommissioning | 0.0 | 0.0
Net Operating Loss Carryforward | 2.5 | 3.9
Valuation Allowance | (0.1) | (0.1)
Tax Credit Carryforward | 0.0 | 0.0
Operating Lease Liability | 0.3 | 0.4
Investment in Partnership | 0.0 | 0.0
Net Deferred Tax Liabilities | 14.1 | 32.2
APPALACHIAN POWER COMPANY |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Deferred Tax Assets | 379.1 | 472.9
Deferred Tax Liabilities | (2,412.6) | (2,484.8)
Net Deferred Tax Liabilities | (2,033.5) | (2,011.9)
Property Related Temporary Differences | (1,784.8) | (1,805.9)
Amounts Due to Customers for Future Income Taxes | 119.0 | 128.0
Securitized Assets | (25.7) | (32.6)
Regulatory Assets | (302.4) | (284.3)
Accrued Nuclear Decommissioning | 0.0 | 0.0
Net Operating Loss Carryforward | 0.4 | 0.2
Valuation Allowance | 0.0 | 0.0
Tax Credit Carryforward | 0.1 | 0.1
Operating Lease Liability | 16.2 | 18.0
Investment in Partnership | (0.1) | (0.1)
Net Deferred Tax Liabilities | (56.2) | (35.3)
INDIANA MICHIGAN POWER COMPANY |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Deferred Tax Assets | 1,072.2 | 1,014.0
Deferred Tax Liabilities | (2,248.0) | (2,183.9)
Net Deferred Tax Liabilities | (1,175.8) | (1,169.9)
Property Related Temporary Differences | (189.9) | (315.6)
Amounts Due to Customers for Future Income Taxes | 73.1 | 103.2
Securitized Assets | 0.0 | 0.0
Regulatory Assets | (49.2) | (27.7)
Accrued Nuclear Decommissioning | (1,052.2) | (923.5)
Net Operating Loss Carryforward | 0.0 | 0.0
Valuation Allowance | 0.0 | 0.0
Tax Credit Carryforward | 39.6 | 7.2
Operating Lease Liability | 13.5 | 14.1
Investment in Partnership | 0.0 | 0.0
Net Deferred Tax Liabilities | (10.7) | (27.6)
OHIO POWER COMPANY |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Deferred Tax Assets | 186.5 | 271.5
Deferred Tax Liabilities | (1,387.6) | (1,424.2)
Net Deferred Tax Liabilities | (1,201.1) | (1,152.7)
Property Related Temporary Differences | (1,290.9) | (1,243.2)
Amounts Due to Customers for Future Income Taxes | 95.6 | 104.6
Securitized Assets | 0.0 | (5.3)
Regulatory Assets | (45.3) | (50.1)
Accrued Nuclear Decommissioning | 0.0 | 0.0
Net Operating Loss Carryforward | 2.9 | 2.6
Valuation Allowance | 0.0 | 0.0
Tax Credit Carryforward | 38.5 | 41.0
Operating Lease Liability | 13.3 | 15.4
Investment in Partnership | (0.8) | (0.7)
Net Deferred Tax Liabilities | (14.4) | (17.0)
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Deferred Tax Assets | 266.9 | 282.4
Deferred Tax Liabilities | (1,197.5) | (1,113.6)
Net Deferred Tax Liabilities | (930.6) | (831.2)
Property Related Temporary Differences | (1,009.8) | (941.9)
Amounts Due to Customers for Future Income Taxes | 80.7 | 99.0
Securitized Assets | 0.0 | 0.0
Regulatory Assets | (53.1) | (67.2)
Accrued Nuclear Decommissioning | 0.0 | 0.0
Net Operating Loss Carryforward | 27.8 | 25.3
Valuation Allowance | 0.0 | 0.0
Tax Credit Carryforward | 26.5 | 53.8
Operating Lease Liability | 27.1 | 28.2
Investment in Partnership | 0.0 | 0.0
Net Deferred Tax Liabilities | (29.8) | (28.4)
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Deferred Tax Assets | 292.8 | 441.5
Deferred Tax Liabilities | (1,564.1) | (1,620.8)
Net Deferred Tax Liabilities | (1,271.3) | (1,179.3)
Property Related Temporary Differences | (1,353.1) | (1,306.0)
Amounts Due to Customers for Future Income Taxes | 90.2 | 142.5
Securitized Assets | (81.1) | 2.8
Regulatory Assets | (87.0) | (146.9)
Accrued Nuclear Decommissioning | 0.0 | 0.0
Net Operating Loss Carryforward | 36.5 | 47.5
Valuation Allowance | 0.0 | (1.8)
Tax Credit Carryforward | 31.7 | 68.6
Operating Lease Liability | 35.7 | 33.3
Investment in Partnership | (1.5) | (1.5)
Net Deferred Tax Liabilities | $ 57.3 | $ (17.8)

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