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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Federal: |  |  |  |
Current |  | $ (116.7) | $ 113.1 | $ (27.8)
Deferred |  | 115.9 | (88.8) | 182.6
Total Federal |  | (0.8) | 24.3 | 154.8
Current |  | 69.0 | 26.6 | 6.0
Deferred |  | (13.6) | (45.5) | (45.3)
Total State and Local |  | 55.4 | (18.9) | (39.3)
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense (Benefit) |  | 54.6 | 5.4 | 115.5
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income |  | 2,212.6 | 2,305.6 | 2,488.1
Less: Equity Earnings |  | (58.5) | 109.4 | (91.7)
Income Tax Expense (Benefit) |  | 54.6 | 5.4 | 115.5
Pretax Income |  | 2,265.8 | 2,309.6 | 2,600.2
Income Taxes on Pretax Income at Statutory Rate (21%) |  | $ 475.8 | $ 485.0 | $ 546.0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 21.00% | 21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation |  | $ 26.0 | $ 17.1 | $ 25.9
Investment Tax Credit Amortization |  | (50.3) | (14.3) | (22.0)
Production Tax Credits |  | (175.2) | (197.1) | (98.8)
State and Local Income Taxes, Net |  | 43.7 | (14.0) | 39.4
Removal Costs |  | (22.0) | (26.5) | (20.0)
AFUDC |  | (39.8) | (29.3) | (30.6)
Effective Income Tax Rate Reconciliation, Parent Company Loss Benefit |  |  |  | 0.0
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments | [1] |  |  | (55.1)
Tax Reform Excess ADIT Reversal |  | (151.1) | (214.5) | (255.6)
Remeasurement of Excess ADIT |  | (46.0) |  |
Federal Return to Provision |  | 0.0 | (17.4) | (1.6)
Disallowance Cost |  | 0.0 |  |
Other |  | (6.5) | 16.4 | (12.1)
Income Tax Expense (Benefit) |  | $ 54.6 | $ 5.4 | $ 115.5
Effective Income Tax Rate |  | 2.40% | 0.20% | 4.40%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets |  | $ 3,216.1 | $ 3,567.4 |
Deferred Tax Liabilities |  | (12,631.8) | (12,464.3) |
Property Related Temporary Differences |  | (7,779.7) | (7,788.1) |
Amounts Due from Customers for Future Federal Income Taxes |  | 900.1 | 962.7 |
Deferred State Income Taxes |  | (1,222.8) | (1,049.3) |
Securitized Assets |  | (79.9) | (98.9) |
Regulatory Assets |  | (768.9) | (865.2) |
Accrued Nuclear Decommissioning |  | (776.5) | (632.7) |
Net Operating Loss Carryforward |  | 148.0 | 132.4 |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward |  | 321.9 | 612.0 |
Operating Lease Liability |  | 131.1 | 142.9 |
Investment in Partnership |  | (293.1) | (338.9) |
All Other, Net |  | 4.1 | 44.8 |
Net Deferred Tax Liabilities |  | (9,415.7) | (8,896.9) |
Tax Contingency [Abstract] |  |  |  |
Unrecognized Tax Benefits, if Recognized - Amount |  | 13.0 | 23.0 | $ 14.0
Income Taxes (Textuals) [Abstract] |  |  |  |
Valuation Allowance |  |  | (28.2) |
Income Tax Expense (Benefit) |  | 54.6 | 5.4 | 115.5
Operating Income (Loss) |  | $ (3,556.2) | (3,482.7) | (3,411.3)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
corporate alternative minimum tax |  | 15.00% |  |
Production Tax Credit Proceeds |  | $ 102.0 |  |
Deferred Revenue |  |  | 7.1 |
Liability, Retirement and Postemployment Benefits |  |  | 2.5 |
Minimum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2036 |  |
Maximum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2041 |  |
AEP Texas Inc. [Member] |  |  |  |
Federal: |  |  |  |
Current |  | $ 19.8 | 29.0 | (1.2)
Deferred |  | 63.5 | 41.4 | 40.5
Total Federal |  | 83.3 | 70.4 | 39.3
Current |  | 2.7 | 2.2 | 3.0
Deferred |  | (0.1) | 0.0 | 0.8
Total State and Local |  | 2.6 | 2.2 | 3.8
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense (Benefit) |  | 85.9 | 72.6 | 43.1
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income |  | 370.4 | 307.9 | 289.8
Income Tax Expense (Benefit) |  | 85.9 | 72.6 | 43.1
Pretax Income |  | 456.3 | 380.5 | 332.9
Income Taxes on Pretax Income at Statutory Rate (21%) |  | 95.8 | 79.9 | 69.9
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation |  | 0.6 | 0.0 | 0.0
Investment Tax Credit Amortization |  | (0.7) | 0.0 | 0.0
Production Tax Credits |  | 0.0 | 0.0 | 0.0
State and Local Income Taxes, Net |  | 2.1 | 1.7 | 2.4
Removal Costs |  | 0.0 | 0.0 | 0.0
AFUDC |  | (6.0) | (4.1) | (4.5)
Effective Income Tax Rate Reconciliation, Parent Company Loss Benefit |  |  |  | (3.2)
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments |  |  |  | 0.0
Tax Reform Excess ADIT Reversal |  | (6.0) | (5.5) | (21.3)
Remeasurement of Excess ADIT |  | 0.0 |  |
Federal Return to Provision |  | (0.1) | 0.0 | 0.0
Disallowance Cost |  | 0.0 |  |
Other |  | 0.2 | 0.6 | (0.2)
Income Tax Expense (Benefit) |  | $ 85.9 | $ 72.6 | $ 43.1
Effective Income Tax Rate |  | 18.80% | 19.10% | 12.90%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets |  | $ 173.6 | $ 177.0 |
Deferred Tax Liabilities |  | (1,401.4) | (1,321.2) |
Property Related Temporary Differences |  | (1,227.1) | (1,130.7) |
Amounts Due from Customers for Future Federal Income Taxes |  | 109.3 | 111.0 |
Deferred State Income Taxes |  | (41.5) | (36.6) |
Securitized Assets |  | (45.6) | (65.0) |
Regulatory Assets |  | (57.6) | (48.9) |
Accrued Nuclear Decommissioning |  | 0.0 | 0.0 |
Net Operating Loss Carryforward |  | 0.0 | 0.0 |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward |  | 13.7 | 0.0 |
Operating Lease Liability |  | 16.6 | 20.3 |
Investment in Partnership |  | 0.0 | 0.0 |
All Other, Net |  | 4.4 | 5.7 |
Net Deferred Tax Liabilities |  | (1,227.8) | (1,144.2) |
Income Taxes (Textuals) [Abstract] |  |  |  |
Valuation Allowance |  |  | 0.0 |
Income Tax Expense (Benefit) |  | 85.9 | 72.6 | $ 43.1
Operating Income (Loss) |  | $ (639.1) | (549.2) | (476.0)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Deferred Revenue |  |  | 0.0 |
Liability, Retirement and Postemployment Benefits |  |  | 0.0 |
AEP Texas Inc. [Member] | Minimum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2036 |  |
AEP Texas Inc. [Member] | Maximum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2041 |  |
AEP Transmission Co [Member] |  |  |  |
Federal: |  |  |  |
Current |  | $ 93.9 | 98.0 | 69.8
Deferred |  | 52.3 | 46.0 | 54.1
Total Federal |  | 146.2 | 144.0 | 123.9
Current |  | 9.1 | 8.8 | 5.8
Deferred |  | (8.2) | 16.3 | 14.4
Total State and Local |  | 0.9 | 25.1 | 20.2
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense (Benefit) |  | 147.1 | 169.1 | 144.1
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income |  | 614.2 | 594.2 | 591.7
Income Tax Expense (Benefit) |  | 147.1 | 169.1 | 144.1
Pretax Income |  | 761.3 | 763.3 | 735.8
Income Taxes on Pretax Income at Statutory Rate (21%) |  | 159.9 | 160.3 | 154.5
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation |  | 2.4 | 0.0 | 0.0
Investment Tax Credit Amortization |  | 0.0 | 0.0 | 0.0
Production Tax Credits |  | 0.0 | 0.0 | 0.0
State and Local Income Taxes, Net |  | 0.7 | 19.8 | 19.8
Removal Costs |  | 0.0 | 0.0 | 0.0
AFUDC |  | (17.5) | (14.8) | (14.1)
Effective Income Tax Rate Reconciliation, Parent Company Loss Benefit |  |  |  | (18.3)
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments |  |  |  | 0.0
Tax Reform Excess ADIT Reversal |  | 1.7 | 0.0 | 0.0
Remeasurement of Excess ADIT |  | 0.0 |  |
Federal Return to Provision |  | 0.0 | 0.0 | 0.0
Disallowance Cost |  | 0.0 |  |
Other |  | (0.1) | 3.8 | 2.2
Income Tax Expense (Benefit) |  | $ 147.1 | $ 169.1 | $ 144.1
Effective Income Tax Rate |  | 19.30% | 22.20% | 19.60%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets |  | $ 188.1 | $ 165.0 |
Deferred Tax Liabilities |  | (1,335.8) | (1,221.5) |
Property Related Temporary Differences |  | (1,134.6) | (1,081.5) |
Amounts Due from Customers for Future Federal Income Taxes |  | 119.0 | 118.5 |
Deferred State Income Taxes |  | (155.4) | (108.1) |
Securitized Assets |  | 0.0 | 0.0 |
Regulatory Assets |  | (7.6) | (1.1) |
Accrued Nuclear Decommissioning |  | 0.0 | 0.0 |
Net Operating Loss Carryforward |  | 3.9 | 5.5 |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward |  | 0.0 | 0.2 |
Operating Lease Liability |  | 0.3 | 0.3 |
Investment in Partnership |  | 0.0 | 0.0 |
All Other, Net |  | 26.7 | 9.8 |
Net Deferred Tax Liabilities |  | (1,147.7) | (1,056.5) |
Income Taxes (Textuals) [Abstract] |  |  |  |
Valuation Allowance |  |  | (0.1) |
Income Tax Expense (Benefit) |  | 147.1 | 169.1 | $ 144.1
Operating Income (Loss) |  | $ (865.6) | (853.7) | (809.3)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Deferred Revenue |  |  | 0.0 |
Liability, Retirement and Postemployment Benefits |  |  | 0.0 |
AEP Transmission Co [Member] | Minimum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2036 |  |
AEP Transmission Co [Member] | Maximum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2041 |  |
Appalachian Power Co [Member] |  |  |  |
Federal: |  |  |  |
Current |  | $ 62.2 | (61.0) | 5.0
Deferred |  | (60.5) | 86.6 | 14.9
Total Federal |  | 1.7 | 25.6 | 19.9
Current |  | 6.3 | (0.4) | 2.2
Deferred |  | 6.2 | (7.0) | 0.0
Total State and Local |  | 12.5 | (7.4) | 2.2
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense (Benefit) |  | 14.2 | 18.2 | 22.1
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income |  | 294.4 | 394.2 | 348.9
Income Tax Expense (Benefit) |  | 14.2 | 18.2 | 22.1
Pretax Income |  | 308.6 | 412.4 | 371.0
Income Taxes on Pretax Income at Statutory Rate (21%) |  | 64.8 | 86.6 | 77.9
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation |  | 9.9 | 4.7 | 11.7
Investment Tax Credit Amortization |  | 0.0 | 0.0 | 0.0
Production Tax Credits |  | (0.1) | 0.0 | 0.0
State and Local Income Taxes, Net |  | 9.9 | (5.9) | 2.1
Removal Costs |  | (5.1) | (9.8) | (7.3)
AFUDC |  | (5.5) | (3.7) | (4.6)
Effective Income Tax Rate Reconciliation, Parent Company Loss Benefit |  |  |  | 0.0
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments | [1] |  |  | 4.5
Tax Reform Excess ADIT Reversal |  | (17.3) | (50.9) | (60.5)
Remeasurement of Excess ADIT |  | (46.0) |  |
Federal Return to Provision |  | 3.4 | (2.8) | (1.6)
Disallowance Cost |  | 0.0 |  |
Other |  | 0.2 | 0.0 | (0.1)
Income Tax Expense (Benefit) |  | $ 14.2 | $ 18.2 | $ 22.1
Effective Income Tax Rate |  | 4.60% | 4.40% | 6.00%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets |  | $ 473.0 | $ 510.3 |
Deferred Tax Liabilities |  | (2,484.9) | (2,502.5) |
Property Related Temporary Differences |  | (1,556.0) | (1,509.8) |
Amounts Due from Customers for Future Federal Income Taxes |  | 143.4 | 163.0 |
Deferred State Income Taxes |  | (308.4) | (318.5) |
Securitized Assets |  | (29.2) | (33.9) |
Regulatory Assets |  | (257.4) | (301.2) |
Accrued Nuclear Decommissioning |  | 0.0 | 0.0 |
Net Operating Loss Carryforward |  | 0.0 | 0.0 |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward |  | 0.1 | 0.0 |
Operating Lease Liability |  | 15.1 | 15.6 |
Investment in Partnership |  | (0.1) | 0.0 |
All Other, Net |  | (19.4) | (7.4) |
Net Deferred Tax Liabilities |  | (2,011.9) | (1,992.2) |
Income Taxes (Textuals) [Abstract] |  |  |  |
Valuation Allowance |  |  | 0.0 |
Income Tax Expense (Benefit) |  | 14.2 | 18.2 | $ 22.1
Operating Income (Loss) |  | $ (531.0) | (602.1) | (549.4)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Deferred Revenue |  |  | 0.0 |
Liability, Retirement and Postemployment Benefits |  |  | 0.0 |
Appalachian Power Co [Member] | Minimum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2036 |  |
Appalachian Power Co [Member] | Maximum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2041 |  |
Indiana Michigan Power Co [Member] |  |  |  |
Federal: |  |  |  |
Current |  | $ 93.2 | 43.4 | 26.9
Deferred |  | (56.9) | (51.3) | (35.5)
Total Federal |  | 36.3 | (7.9) | (8.6)
Current |  | 21.1 | 10.9 | (0.6)
Deferred |  | 1.2 | 1.2 | (1.4)
Total State and Local |  | 22.3 | 12.1 | (2.0)
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense (Benefit) |  | 58.6 | 4.2 | (10.6)
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income |  | 335.9 | 324.7 | 279.8
Income Tax Expense (Benefit) |  | 58.6 | 4.2 | (10.6)
Pretax Income |  | 394.5 | 328.9 | 269.2
Income Taxes on Pretax Income at Statutory Rate (21%) |  | 82.8 | 69.1 | 56.5
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation |  | 6.4 | 2.9 | 3.5
Investment Tax Credit Amortization |  | (1.6) | (3.1) | (6.4)
Production Tax Credits |  | 0.0 | 0.0 | 0.0
State and Local Income Taxes, Net |  | 17.5 | 9.6 | (1.3)
Removal Costs |  | (11.8) | (12.4) | (9.7)
AFUDC |  | (2.3) | (2.1) | (2.7)
Effective Income Tax Rate Reconciliation, Parent Company Loss Benefit |  |  |  | (2.8)
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments |  |  |  | 0.0
Tax Reform Excess ADIT Reversal |  | (30.0) | (54.0) | (46.3)
Remeasurement of Excess ADIT |  | 0.0 |  |
Federal Return to Provision |  | (2.5) | (6.2) | (0.6)
Disallowance Cost |  | 0.0 |  |
Other |  | 0.1 | 0.4 | (0.8)
Income Tax Expense (Benefit) |  | $ 58.6 | $ 4.2 | $ (10.6)
Effective Income Tax Rate |  | 14.90% | 1.30% | (3.90%)
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets |  | $ 1,014.1 | $ 933.7 |
Deferred Tax Liabilities |  | (2,184.0) | (2,090.7) |
Property Related Temporary Differences |  | (298.1) | (398.0) |
Amounts Due from Customers for Future Federal Income Taxes |  | 103.2 | 114.3 |
Deferred State Income Taxes |  | (238.1) | (227.0) |
Securitized Assets |  | 0.0 | 0.0 |
Regulatory Assets |  | 32.3 | (29.5) |
Accrued Nuclear Decommissioning |  | (776.5) | (632.7) |
Net Operating Loss Carryforward |  | 0.0 | 0.0 |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward |  | 7.2 | 0.0 |
Operating Lease Liability |  | 10.8 | 13.6 |
Investment in Partnership |  | 0.0 | 0.0 |
All Other, Net |  | (10.7) | 2.3 |
Net Deferred Tax Liabilities |  | (1,169.9) | (1,157.0) |
Income Taxes (Textuals) [Abstract] |  |  |  |
Valuation Allowance |  |  | 0.0 |
Income Tax Expense (Benefit) |  | 58.6 | 4.2 | $ (10.6)
Operating Income (Loss) |  | $ (487.7) | (419.9) | (357.9)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Deferred Revenue |  |  | 0.0 |
Liability, Retirement and Postemployment Benefits |  |  | 0.0 |
Indiana Michigan Power Co [Member] | Minimum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2036 |  |
Indiana Michigan Power Co [Member] | Maximum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2041 |  |
Ohio Power Co [Member] |  |  |  |
Federal: |  |  |  |
Current |  | $ 46.6 | (27.0) | 6.8
Deferred |  | 2.8 | 73.3 | 25.2
Total Federal |  | 49.4 | 46.3 | 32.0
Current |  | (0.3) | (0.3) | (3.1)
Deferred |  | 5.2 | (1.8) | 5.5
Total State and Local |  | 4.9 | (2.1) | 2.4
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense (Benefit) |  | 54.3 | 44.2 | 34.4
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income |  | 328.2 | 287.8 | 253.6
Less: Equity Earnings |  | 0.0 | (0.6) | 0.0
Income Tax Expense (Benefit) |  | 54.3 | 44.2 | 34.4
Pretax Income |  | 382.5 | 331.4 | 288.0
Income Taxes on Pretax Income at Statutory Rate (21%) |  | 80.3 | 69.6 | 60.5
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation |  | 2.6 | 3.0 | 2.2
Investment Tax Credit Amortization |  | 0.0 | 0.0 | 0.0
Production Tax Credits |  | 0.0 | 0.0 | 0.0
State and Local Income Taxes, Net |  | 3.9 | (1.6) | 0.0
Removal Costs |  | 0.0 | 0.0 | 0.0
AFUDC |  | (3.6) | (2.9) | (2.3)
Effective Income Tax Rate Reconciliation, Parent Company Loss Benefit |  |  |  | 0.0
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments | [1] |  |  | 8.9
Tax Reform Excess ADIT Reversal |  | (28.9) | (27.5) | (32.6)
Remeasurement of Excess ADIT |  | 0.0 |  |
Federal Return to Provision |  | (0.4) | 3.5 | (1.2)
Disallowance Cost |  | 0.0 |  |
Other |  | 0.4 | 0.1 | (1.1)
Income Tax Expense (Benefit) |  | $ 54.3 | $ 44.2 | $ 34.4
Effective Income Tax Rate |  | 14.20% | 13.30% | 11.90%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets |  | $ 271.4 | $ 218.8 |
Deferred Tax Liabilities |  | (1,424.1) | (1,319.9) |
Property Related Temporary Differences |  | (1,162.1) | (1,133.8) |
Amounts Due from Customers for Future Federal Income Taxes |  | 104.5 | 112.6 |
Deferred State Income Taxes |  | (68.8) | (59.6) |
Securitized Assets |  | (5.1) | 0.0 |
Regulatory Assets |  | (83.5) | (57.6) |
Accrued Nuclear Decommissioning |  | 0.0 | 0.0 |
Net Operating Loss Carryforward |  | 2.6 | 0.0 |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward |  | 41.0 | 0.0 |
Operating Lease Liability |  | 14.6 | 15.5 |
Investment in Partnership |  | (0.7) | 0.0 |
All Other, Net |  | 4.8 | 21.8 |
Net Deferred Tax Liabilities |  | (1,152.7) | (1,101.1) |
Income Taxes (Textuals) [Abstract] |  |  |  |
Valuation Allowance |  |  | 0.0 |
Income Tax Expense (Benefit) |  | 54.3 | 44.2 | $ 34.4
Operating Income (Loss) |  | $ (469.9) | (413.7) | (385.2)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Deferred Revenue |  |  | 0.0 |
Liability, Retirement and Postemployment Benefits |  |  | 0.0 |
Ohio Power Co [Member] | Minimum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2036 |  |
Ohio Power Co [Member] | Maximum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2041 |  |
Public Service Co Of Oklahoma [Member] |  |  |  |
Federal: |  |  |  |
Current |  | $ (60.8) | (3.3) | (109.6)
Deferred |  | 2.9 | (50.5) | 105.6
Total Federal |  | (57.9) | (53.8) | (4.0)
Current |  | 0.3 | 0.0 | 0.0
Deferred |  | 4.0 | 4.6 | 8.1
Total State and Local |  | 4.3 | 4.6 | 8.1
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense (Benefit) |  | (53.6) | (49.2) | 4.1
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income |  | 208.8 | 167.6 | 141.1
Income Tax Expense (Benefit) |  | (53.6) | (49.2) | 4.1
Pretax Income |  | 155.2 | 118.4 | 145.2
Income Taxes on Pretax Income at Statutory Rate (21%) |  | 32.6 | 24.9 | 30.5
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation |  | 0.4 | 0.0 | 0.0
Investment Tax Credit Amortization |  | (1.4) | (1.6) | (1.8)
Production Tax Credits |  | (64.3) | (47.7) | (6.0)
State and Local Income Taxes, Net |  | 3.5 | 4.3 | 6.4
Removal Costs |  | 0.0 | 0.0 | 0.0
AFUDC |  | (1.8) | 0.0 | 0.0
Effective Income Tax Rate Reconciliation, Parent Company Loss Benefit |  |  |  | 0.0
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments |  |  |  | 0.0
Tax Reform Excess ADIT Reversal |  | (23.3) | (25.4) | (25.4)
Remeasurement of Excess ADIT |  | 0.0 |  |
Federal Return to Provision |  | 0.6 | (3.7) | 0.7
Disallowance Cost |  | 0.0 |  |
Other |  | 0.1 | 0.0 | (0.3)
Income Tax Expense (Benefit) |  | $ (53.6) | $ (49.2) | $ 4.1
Effective Income Tax Rate |  | (34.50%) | (41.60%) | 2.80%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets |  | $ 282.3 | $ 225.0 |
Deferred Tax Liabilities |  | (1,113.5) | (1,013.6) |
Property Related Temporary Differences |  | (817.2) | (763.3) |
Amounts Due from Customers for Future Federal Income Taxes |  | 88.6 | 96.0 |
Deferred State Income Taxes |  | (122.6) | (81.9) |
Securitized Assets |  | 0.0 | 0.0 |
Regulatory Assets |  | (83.8) | (140.2) |
Accrued Nuclear Decommissioning |  | 0.0 | 0.0 |
Net Operating Loss Carryforward |  | 25.3 | 25.8 |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward |  | 53.8 | 54.3 |
Operating Lease Liability |  | 23.6 | 0.0 |
Investment in Partnership |  | 0.0 | 0.0 |
All Other, Net |  | 1.1 | 20.7 |
Net Deferred Tax Liabilities |  | (831.2) | (788.6) |
Income Taxes (Textuals) [Abstract] |  |  |  |
Valuation Allowance |  |  | 0.0 |
Income Tax Expense (Benefit) |  | (53.6) | (49.2) | $ 4.1
Operating Income (Loss) |  | $ (234.3) | (180.8) | (192.9)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Deferred Revenue |  |  | 0.0 |
Liability, Retirement and Postemployment Benefits |  |  | 0.0 |
Public Service Co Of Oklahoma [Member] | Minimum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2036 |  |
Public Service Co Of Oklahoma [Member] | Maximum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2041 |  |
Southwestern Electric Power Co [Member] |  |  |  |
Federal: |  |  |  |
Current |  | $ (88.1) | (32.3) | (16.7)
Deferred |  | 59.9 | 13.4 | 26.2
Total Federal |  | (28.2) | (18.9) | 9.5
Current |  | 1.0 | (1.8) | 0.4
Deferred |  | (6.1) | (4.5) | (10.5)
Total State and Local |  | (5.1) | (6.3) | (10.1)
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense (Benefit) |  | (33.3) | (25.2) | (0.6)
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income |  | 223.8 | 294.3 | 242.1
Less: Equity Earnings |  | (1.4) | (1.4) | (3.4)
Income Tax Expense (Benefit) |  | (33.3) | (25.2) | (0.6)
Pretax Income |  | 189.1 | 267.7 | 238.1
Income Taxes on Pretax Income at Statutory Rate (21%) |  | 39.7 | 56.2 | 50.0
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation |  | 2.1 | 2.3 | 1.8
Investment Tax Credit Amortization |  | (0.2) | 0.0 | 0.0
Production Tax Credits |  | (67.1) | (57.1) | (7.2)
State and Local Income Taxes, Net |  | (4.0) | (4.9) | (8.0)
Removal Costs |  | 0.0 | 0.0 | 0.0
AFUDC |  | (2.4) | 0.0 | 0.0
Effective Income Tax Rate Reconciliation, Parent Company Loss Benefit |  |  |  | 0.0
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments |  |  |  | 0.0
Tax Reform Excess ADIT Reversal |  | (12.6) | (14.8) | (31.1)
Remeasurement of Excess ADIT |  | 0.0 |  |
Federal Return to Provision |  | 1.0 | 0.0 | 0.0
Disallowance Cost |  | 12.0 |  |
Other |  | (1.8) | (6.9) | (6.1)
Income Tax Expense (Benefit) |  | $ (33.3) | $ (25.2) | $ (0.6)
Effective Income Tax Rate |  | (17.60%) | (9.40%) | (0.30%)
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets |  | $ 441.5 | $ 374.9 |
Deferred Tax Liabilities |  | (1,620.8) | (1,464.6) |
Property Related Temporary Differences |  | (1,087.2) | (1,053.8) |
Amounts Due from Customers for Future Federal Income Taxes |  | 142.5 | 146.2 |
Deferred State Income Taxes |  | (238.6) | (208.7) |
Securitized Assets |  | 0.0 | 0.0 |
Regulatory Assets |  | (143.4) | (114.1) |
Accrued Nuclear Decommissioning |  | 0.0 | 0.0 |
Net Operating Loss Carryforward |  | 47.5 | 42.7 |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward |  | 68.6 | 66.0 |
Operating Lease Liability |  | 26.3 | 0.0 |
Investment in Partnership |  | (1.3) | 0.0 |
All Other, Net |  | 6.3 | 32.0 |
Net Deferred Tax Liabilities |  | (1,179.3) | (1,089.7) |
Income Taxes (Textuals) [Abstract] |  |  |  |
Valuation Allowance |  |  | 0.0 |
Income Tax Expense (Benefit) |  | (33.3) | (25.2) | $ (0.6)
Operating Income (Loss) |  | $ (292.3) | (370.0) | (339.5)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Deferred Revenue |  |  | 0.0 |
Liability, Retirement and Postemployment Benefits |  |  | 0.0 |
Southwestern Electric Power Co [Member] | Minimum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2036 |  |
Southwestern Electric Power Co [Member] | Maximum [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2041 |  |
Arkansas |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 259.3 |  |
Arkansas | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2024 |  |
Arkansas | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2033 |  |
Arkansas | Southwestern Electric Power Co [Member] | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2024 |  |
Arkansas | Southwestern Electric Power Co [Member] | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2033 |  |
Kentucky |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 204.1 |  |
Kentucky | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2030 |  |
Kentucky | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2037 |  |
Louisiana |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 629.2 |  |
Louisiana | Southwestern Electric Power Co [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | 619.1 |  |
Oklahoma |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 877.9 |  |
Oklahoma | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2037 |  |
Oklahoma | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2037 |  |
Oklahoma | Public Service Co Of Oklahoma [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 947.1 |  |
Oklahoma | Public Service Co Of Oklahoma [Member] | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2037 |  |
Oklahoma | Public Service Co Of Oklahoma [Member] | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2037 |  |
Tennessee |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 47.7 |  |
Tennessee | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2032 |  |
Tennessee | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2038 |  |
Ohio Municipal |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 1,954.8 |  |
Ohio Municipal | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2024 |  |
Ohio Municipal | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2028 |  |
Ohio Municipal | Ohio Power Co [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 152.3 |  |
Ohio Municipal | Ohio Power Co [Member] | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2024 |  |
Ohio Municipal | Ohio Power Co [Member] | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2028 |  |
Colorado |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 80.8 |  |
Pennsylvania | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2030 |  |
Pennsylvania | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2043 |  |
Illinois |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 54.4 |  |
Federal |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 321.9 |  |
Federal | AEP Texas Inc. [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 13.7 |  |
Federal | Appalachian Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 0.1 |  |
Federal | Indiana Michigan Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 7.2 |  |
Federal | Ohio Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 41.0 |  |
Federal | Public Service Co Of Oklahoma [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 53.8 |  |
Federal | Southwestern Electric Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 68.6 |  |
State and Local Jurisdiction |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 40.0 |  |
State and Local Jurisdiction | AEP Texas Inc. [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 0.0 |  |
State and Local Jurisdiction | Appalachian Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 0.0 |  |
State and Local Jurisdiction | Indiana Michigan Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 0.0 |  |
State and Local Jurisdiction | Ohio Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 0.0 |  |
State and Local Jurisdiction | Public Service Co Of Oklahoma [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 40.0 |  |
State and Local Jurisdiction | Southwestern Electric Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount |  | 0.0 |  |
MICHIGAN |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 45.6 |  |
MICHIGAN | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2030 |  |
MICHIGAN | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2032 |  |
PENNSYLVANIA |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 47.8 |  |
ILLINOIS | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2039 |  |
ILLINOIS | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2041 |  |
Arkansas | Southwestern Electric Power Co [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward |  | $ 258.9 |  |
COLORADO | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2041 |  |
Dolet Hills Lignite Co, LLC [Member] |  |  |  |
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Less: Equity Earnings |  | $ (1.4) | (1.4) | (3.4)
Dolet Hills Lignite Co, LLC [Member] | Southwestern Electric Power Co [Member] |  |  |  |
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Less: Equity Earnings |  | (1.4) | (1.4) | (3.4)
Investment funds | AEP Texas Inc. [Member] |  |  |  |
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Less: Equity Earnings |  | 0.0 | 0.0 | 0.0
Investment funds | AEP Transmission Co [Member] |  |  |  |
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Less: Equity Earnings |  | 0.0 | 0.0 | 0.0
Investment funds | Appalachian Power Co [Member] |  |  |  |
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Less: Equity Earnings |  | 0.0 | 0.0 | 0.0
Investment funds | Indiana Michigan Power Co [Member] |  |  |  |
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Less: Equity Earnings |  | 0.0 | 0.0 | 0.0
Investment funds | Ohio Power Co [Member] |  |  |  |
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Less: Equity Earnings |  | 0.0 | (0.6) | 0.0
Investment funds | Public Service Co Of Oklahoma [Member] |  |  |  |
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Less: Equity Earnings |  | $ 0.0 | $ 0.0 | $ 0.0
[1] | 2021 amount represents an out of period adjustment related to Deferred Income Taxes and Income Tax Expense (Benefit). Management concluded the misstatement and subsequent correction was not material to the 2021 or prior period financial statements.

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- Definition The total of all other differences not specifically indicated elsewhere between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with GAAP that will result in taxable amounts in one or more future periods. + References No definition available. + Details
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