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v3.23.1

Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Federal: |  |  |  |
Current | $ 113.1 | $ (27.8) |  | $ (138.2)
Deferred | (88.8) | 182.6 |  | 146.9
Total Federal | 24.3 | 154.8 |  | 8.7
Current | 26.6 | 6.0 |  | (16.7)
Deferred | (45.5) | (45.3) |  | 48.5
Total State and Local | (18.9) | (39.3) |  | 31.8
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense/Benefit | 5.4 | 115.5 |  | 40.5
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income | 2,305.6 | 2,488.1 |  | 2,196.7
Less: Equity Earnings | 109.4 | (91.7) |  | (91.1)
Income Tax Expense/Benefit | 5.4 | 115.5 |  | 40.5
Pretax Income | 2,309.6 | 2,600.2 |  | 2,234.3
Income Taxes on Pretax Income at Statutory Rate (21%) | $ 485.0 | $ 546.0 |  | $ 469.2
Federal Statutory Income Tax Rate | 21.00% | 21.00% |  | 21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation | $ 17.1 | $ 25.9 |  | $ 26.5
Income Tax Reconciliation Nondeductible Expense Permanent Miscellaneous | 11.5 | (1.3) |  | (9.7)
Investment Tax Credit Amortization | (14.3) | (22.0) |  | (18.8)
Production Tax Credits | (197.1) | (98.8) |  | (83.1)
State and Local Income Taxes, Net | (14.0) | 39.4 |  | 25.1
Removal Costs | (26.5) | (20.0) |  | (18.6)
AFUDC | (29.3) | (30.6) |  | (32.5)
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments | 0.0 | (55.1) | [1] | 0.0
Tax Reform Excess ADIT Reversal | (214.5) | (255.6) |  | (268.2)
Federal Return to Provision | (17.4) | (1.6) |  | (2.6)
CARES Act Provision | 0.0 | 0.0 |  | (48.0)
Other | 4.9 | (10.8) |  | 1.2
Income Tax Expense/Benefit | $ 5.4 | $ 115.5 |  | $ 40.5
Effective Income Tax Rate | 0.20% | 4.40% |  | 1.80%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets | $ 3,567.4 | $ 3,347.1 |  |
Deferred Tax Liabilities | (12,464.3) | (11,991.2) |  |
Property Related Temporary Differences | (7,788.1) | (7,346.4) |  |
Amounts Due from Customers for Future Federal Income Taxes | 962.7 | 1,086.6 |  |
Deferred State Income Taxes | (1,049.3) | (1,211.8) |  |
Securitized Assets | (98.9) | (128.8) |  |
Regulatory Assets | (865.2) | (746.6) |  |
Accrued Nuclear Decommissioning | (632.7) | (743.2) |  |
Net Operating Loss Carryforward | 132.4 | 303.2 |  |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward | 612.0 | 440.1 |  |
Operating Lease Liability | 142.9 | 116.3 |  |
Investment in Partnership | (338.9) | (392.1) |  |
All Other, Net | 44.8 | 41.0 |  |
Net Deferred Tax Liabilities | (8,896.9) | (8,644.1) |  |
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits |  |  |  |
Balance at January 1, | 14.3 | 13.2 |  | $ 24.1
Increase - Tax Positions Taken During a Prior Period | 5.1 | 1.2 |  | 0.6
Decrease - Tax Positions Taken During a Prior Period | 0.0 | (3.2) |  | (14.5)
Increase - Tax Positions Taken During the Current Year | 3.8 | 3.1 |  | 3.0
Decrease - Settlements with Taxing Authorities | 0.0 | 0.0 |  | 0.0
Decrease - Lapse of the Applicable Statute of Limitations | 0.0 | 0.0 |  | 0.0
Balance at December 31, | 23.2 | 14.3 |  | 13.2
Tax Contingency [Abstract] |  |  |  |
Unrecognized Tax Benefits, if Recognized - Amount | 23.0 | 14.0 |  | 12.0
Income Taxes (Textuals) [Abstract] |  |  |  |
Valuation Allowance | (28.2) | (25.0) |  |
Income Tax Expense/Benefit | 5.4 | 115.5 |  | 40.5
Income Taxes Receivable |  | 95.0 |  |
Income Tax Expense Re-Measurement |  | 23.0 |  |
Operating Income (Loss) | (3,482.7) | (3,411.3) |  | (2,987.7)
Deferred Revenue | 7.1 | 8.8 |  |
Liability, Retirement and Postemployment Benefits | 2.5 | (46.2) |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 5.1 | 1.2 |  | 0.6
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 0.0 | 3.2 |  | 14.5
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 3.8 | 3.1 |  | 3.0
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | 0.0 | 0.0 |  | 0.0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0.0 | 0.0 |  | 0.0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 0.0 | 0.0 |  | 0.0
Unrecognized Tax Benefits | $ 23.2 | 14.3 |  | 13.2
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  | 48.0
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 | $ 29.0 | (1.2) |  | 5.2
Deferred | 41.4 | 40.5 |  | (15.4)
Total Federal | 70.4 | 39.3 |  | (10.2)
Current | 2.2 | 3.0 |  | (0.1)
Deferred | 0.0 | 0.8 |  | (0.9)
Total State and Local | 2.2 | 3.8 |  | (1.0)
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense/Benefit | 72.6 | 43.1 |  | (11.2)
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income | 307.9 | 289.8 |  | 241.0
Income Tax Expense/Benefit | 72.6 | 43.1 |  | (11.2)
Pretax Income | 380.5 | 332.9 |  | 229.8
Income Taxes on Pretax Income at Statutory Rate (21%) | $ 79.9 | $ 69.9 |  | $ 48.3
Federal Statutory Income Tax Rate | 21.00% | 21.00% |  | 21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
State and Local Income Taxes, Net | $ 1.7 | $ 2.4 |  | $ (0.8)
AFUDC | (4.1) | (4.5) |  | (4.1)
Parent Company Loss Benefit | 0.0 | (3.2) |  | (4.5)
Tax Reform Excess ADIT Reversal | (5.5) | (21.3) |  | (47.9)
Other | 0.6 | (0.2) |  | (2.2)
Income Tax Expense/Benefit | $ 72.6 | $ 43.1 |  | $ (11.2)
Effective Income Tax Rate | 19.10% | 12.90% |  | (4.90%)
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets | $ 177.0 | $ 173.8 |  |
Deferred Tax Liabilities | (1,321.2) | (1,262.7) |  |
Property Related Temporary Differences | (1,130.7) | (1,060.2) |  |
Amounts Due from Customers for Future Federal Income Taxes | 111.0 | 110.0 |  |
Deferred State Income Taxes | (36.6) | (32.2) |  |
Securitized Transition Assets | (65.0) | (84.4) |  |
Regulatory Assets | (48.9) | (45.1) |  |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Operating Lease Liability | 20.3 | 15.8 |  |
All Other, Net | 5.7 | 7.2 |  |
Net Deferred Tax Liabilities | (1,144.2) | (1,088.9) |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Income Tax Expense/Benefit | 72.6 | 43.1 |  | $ (11.2)
Operating Income (Loss) | $ (549.2) | (476.0) |  | (369.6)
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 | $ 98.0 | 69.8 |  | 22.2
Deferred | 46.0 | 54.1 |  | 65.4
Total Federal | 144.0 | 123.9 |  | 87.6
Current | 8.8 | 5.8 |  | 2.8
Deferred | 16.3 | 14.4 |  | 16.3
Total State and Local | 25.1 | 20.2 |  | 19.1
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense/Benefit | 169.1 | 144.1 |  | 106.7
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income | 594.2 | 591.7 |  | 423.4
Income Tax Expense/Benefit | 169.1 | 144.1 |  | 106.7
Pretax Income | 763.3 | 735.8 |  | 530.1
Income Taxes on Pretax Income at Statutory Rate (21%) | $ 160.3 | $ 154.5 |  | $ 111.3
Federal Statutory Income Tax Rate | 21.00% | 21.00% |  | 21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
State and Local Income Taxes, Net | $ 19.8 | $ 19.8 |  | $ 15.1
AFUDC | (14.8) | (14.1) |  | (15.5)
Parent Company Loss Benefit | 0.0 | (18.3) |  | (7.0)
Other | 3.8 | 2.2 |  | 2.8
Income Tax Expense/Benefit | $ 169.1 | $ 144.1 |  | $ 106.7
Effective Income Tax Rate | 22.20% | 19.60% |  | 20.10%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets | $ 165.0 | $ 161.2 |  |
Deferred Tax Liabilities | (1,221.5) | (1,139.5) |  |
Property Related Temporary Differences | (1,081.5) | (1,012.4) |  |
Amounts Due from Customers for Future Federal Income Taxes | 118.5 | 120.1 |  |
Deferred State Income Taxes | (108.1) | (97.0) |  |
Regulatory Assets | (1.1) | (1.3) |  |
Net Operating Loss Carryforward | 5.5 | 8.1 |  |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward | 0.2 | 0.1 |  |
Operating Lease Liability | 0.3 | 0.1 |  |
Investment in Partnership | (0.1) | (0.1) |  |
All Other, Net | 9.8 | 4.1 |  |
Net Deferred Tax Liabilities | (1,056.5) | (978.3) |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Income Tax Expense/Benefit | 169.1 | 144.1 |  | $ 106.7
Operating Income (Loss) | $ (853.7) | (809.3) |  | (581.5)
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 | $ (61.0) | 5.0 |  | 21.4
Deferred | 86.6 | 14.9 |  | (27.1)
Total Federal | 25.6 | 19.9 |  | (5.7)
Current | (0.4) | 2.2 |  | 9.3
Deferred | (7.0) | 0.0 |  | 0.7
Total State and Local | (7.4) | 2.2 |  | 10.0
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense/Benefit | 18.2 | 22.1 |  | 4.3
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income | 394.2 | 348.9 |  | 369.7
Income Tax Expense/Benefit | 18.2 | 22.1 |  | 4.3
Pretax Income | 412.4 | 371.0 |  | 374.0
Income Taxes on Pretax Income at Statutory Rate (21%) | $ 86.6 | $ 77.9 |  | $ 78.5
Federal Statutory Income Tax Rate | 21.00% | 21.00% |  | 21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation | $ 4.7 | $ 11.7 |  | $ 12.7
State and Local Income Taxes, Net | (5.9) | 2.1 |  | 7.9
Removal Costs | (9.8) | (7.3) |  | (5.7)
AFUDC | (3.7) | (4.6) |  | (4.5)
Parent Company Loss Benefit | 0.0 | 0.0 |  | (6.2)
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments | 0.0 | 4.5 | [1] | 0.0
Tax Reform Excess ADIT Reversal | (50.9) | (60.5) |  | (72.3)
Federal Return to Provision | (2.8) | (1.6) |  | (7.2)
Other | 0.0 | (0.1) |  | 1.1
Income Tax Expense/Benefit | $ 18.2 | $ 22.1 |  | $ 4.3
Effective Income Tax Rate | 4.40% | 6.00% |  | 1.10%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets | $ 510.3 | $ 495.1 |  |
Deferred Tax Liabilities | (2,502.5) | (2,299.8) |  |
Property Related Temporary Differences | (1,509.8) | (1,476.5) |  |
Amounts Due from Customers for Future Federal Income Taxes | 163.0 | 182.1 |  |
Deferred State Income Taxes | (318.5) | (288.8) |  |
Securitized Assets | (33.9) | (39.3) |  |
Regulatory Assets | (301.2) | (177.0) |  |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Operating Lease Liability | 15.6 | 14.2 |  |
All Other, Net | (7.4) | (19.4) |  |
Net Deferred Tax Liabilities | (1,992.2) | (1,804.7) |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Income Tax Expense/Benefit | 18.2 | 22.1 |  | $ 4.3
Operating Income (Loss) | $ (602.1) | (549.4) |  | (556.6)
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 | $ 43.4 | 26.9 |  | 11.3
Deferred | (51.3) | (35.5) |  | (20.6)
Total Federal | (7.9) | (8.6) |  | (9.3)
Current | 10.9 | (0.6) |  | 1.9
Deferred | 1.2 | (1.4) |  | (0.1)
Total State and Local | 12.1 | (2.0) |  | 1.8
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense/Benefit | 4.2 | (10.6) |  | (7.5)
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income | 324.7 | 279.8 |  | 284.8
Income Tax Expense/Benefit | 4.2 | (10.6) |  | (7.5)
Pretax Income | 328.9 | 269.2 |  | 277.3
Income Taxes on Pretax Income at Statutory Rate (21%) | $ 69.1 | $ 56.5 |  | $ 58.2
Federal Statutory Income Tax Rate | 21.00% | 21.00% |  | 21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation | $ 2.9 | $ 3.5 |  | $ 1.6
Investment Tax Credit Amortization | (3.1) | (6.4) |  | (4.5)
State and Local Income Taxes, Net | 9.6 | (1.3) |  | 1.5
Removal Costs | (12.4) | (9.7) |  | (10.5)
AFUDC | (2.1) | (2.7) |  | (2.4)
Parent Company Loss Benefit | 0.0 | (2.8) |  | (6.4)
Tax Reform Excess ADIT Reversal | (54.0) | (46.3) |  | (46.8)
Federal Return to Provision | (6.2) | (0.6) |  | 1.8
Other | 0.4 | (0.8) |  | 0.0
Income Tax Expense/Benefit | $ 4.2 | $ (10.6) |  | $ (7.5)
Effective Income Tax Rate | 1.30% | (3.90%) |  | (2.70%)
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets | $ 933.7 | $ 1,072.2 |  |
Deferred Tax Liabilities | (2,090.7) | (2,172.4) |  |
Property Related Temporary Differences | (398.0) | (286.2) |  |
Amounts Due from Customers for Future Federal Income Taxes | 114.3 | 135.5 |  |
Deferred State Income Taxes | (227.0) | (222.0) |  |
Regulatory Assets | (29.5) | (23.6) |  |
Accrued Nuclear Decommissioning | (632.7) | (743.2) |  |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Operating Lease Liability | 13.6 | 13.5 |  |
All Other, Net | 2.3 | 25.8 |  |
Net Deferred Tax Liabilities | (1,157.0) | (1,100.2) |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Income Tax Expense/Benefit | 4.2 | (10.6) |  | $ (7.5)
Operating Income (Loss) | $ (419.9) | (357.9) |  | (362.9)
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 | $ (27.0) | 6.8 |  | (26.6)
Deferred | 73.3 | 25.2 |  | 74.0
Total Federal | 46.3 | 32.0 |  | 47.4
Current | (0.3) | (3.1) |  | (5.4)
Deferred | (1.8) | 5.5 |  | 3.2
Total State and Local | (2.1) | 2.4 |  | (2.2)
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense/Benefit | 44.2 | 34.4 |  | 45.2
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income | 287.8 | 253.6 |  | 271.4
Less: Equity Earnings | (0.6) | 0.0 |  | 0.0
Income Tax Expense/Benefit | 44.2 | 34.4 |  | 45.2
Pretax Income | 331.4 | 288.0 |  | 316.6
Income Taxes on Pretax Income at Statutory Rate (21%) | $ 69.6 | $ 60.5 |  | $ 66.5
Federal Statutory Income Tax Rate | 21.00% | 21.00% |  | 21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation | $ 3.0 | $ 2.2 |  | $ 3.7
State and Local Income Taxes, Net | (1.6) | 0.0 |  | (1.7)
AFUDC | (2.9) | (2.3) |  | (2.6)
Increase Decrease in Income Taxes Due to Tax Reserve Adjustments | 0.0 | 8.9 | [1] | 0.0
Tax Reform Excess ADIT Reversal | (27.5) | (32.6) |  | (27.2)
Federal Return to Provision | 3.5 | (1.2) |  | 6.5
Other | 0.1 | (1.1) |  | 0.0
Income Tax Expense/Benefit | $ 44.2 | $ 34.4 |  | $ 45.2
Effective Income Tax Rate | 13.30% | 11.90% |  | 14.30%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets | $ 218.8 | $ 204.4 |  |
Deferred Tax Liabilities | (1,319.9) | (1,205.3) |  |
Property Related Temporary Differences | (1,133.8) | (1,042.0) |  |
Amounts Due from Customers for Future Federal Income Taxes | 112.6 | 117.7 |  |
Deferred State Income Taxes | (59.6) | (58.8) |  |
Regulatory Assets | (57.6) | (39.8) |  |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Operating Lease Liability | 15.5 | 17.2 |  |
All Other, Net | 21.8 | 4.8 |  |
Net Deferred Tax Liabilities | (1,101.1) | (1,000.9) |  |
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits |  |  |  |
Balance at January 1, | 0.0 | 3.2 |  | $ 8.4
Increase - Tax Positions Taken During a Prior Period | 5.1 | 0.0 |  | 0.0
Decrease - Tax Positions Taken During a Prior Period | 0.0 | (3.2) |  | (5.2)
Increase - Tax Positions Taken During the Current Year | 0.0 | 0.0 |  | 0.0
Decrease - Settlements with Taxing Authorities | 0.0 | 0.0 |  | 0.0
Decrease - Lapse of the Applicable Statute of Limitations | 0.0 | 0.0 |  | 0.0
Balance at December 31, | 5.1 | 0.0 |  | 3.2
Income Taxes (Textuals) [Abstract] |  |  |  |
Income Tax Expense/Benefit | 44.2 | 34.4 |  | 45.2
Operating Income (Loss) | (413.7) | (385.2) |  | (403.7)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 5.1 | 0.0 |  | 0.0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 0.0 | 3.2 |  | 5.2
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 0.0 | 0.0 |  | 0.0
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | 0.0 | 0.0 |  | 0.0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0.0 | 0.0 |  | 0.0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 0.0 | 0.0 |  | 0.0
Unrecognized Tax Benefits | $ 5.1 | 0.0 |  | 3.2
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 | $ (3.3) | (109.6) |  | (11.4)
Deferred | (50.5) | 105.6 |  | 8.3
Total Federal | (53.8) | (4.0) |  | (3.1)
Current | 0.0 | 0.0 |  | 0.1
Deferred | 4.6 | 8.1 |  | 8.2
Total State and Local | 4.6 | 8.1 |  | 8.3
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense/Benefit | (49.2) | 4.1 |  | 5.2
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income | 167.6 | 141.1 |  | 123.0
Income Tax Expense/Benefit | (49.2) | 4.1 |  | 5.2
Pretax Income | 118.4 | 145.2 |  | 128.2
Income Taxes on Pretax Income at Statutory Rate (21%) | $ 24.9 | $ 30.5 |  | $ 26.9
Federal Statutory Income Tax Rate | 21.00% | 21.00% |  | 21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Investment Tax Credit Amortization | $ (1.6) | $ (1.8) |  | $ (2.1)
Production Tax Credits | (47.7) | (6.0) |  | 0.0
State and Local Income Taxes, Net | 4.3 | 6.4 |  | 6.5
Parent Company Loss Benefit | 0.0 | 0.0 |  | (0.2)
Tax Reform Excess ADIT Reversal | (25.4) | (25.4) |  | (25.5)
Federal Return to Provision | (3.7) | 0.7 |  | (0.5)
Other | 0.0 | (0.3) |  | 0.1
Income Tax Expense/Benefit | $ (49.2) | $ 4.1 |  | $ 5.2
Effective Income Tax Rate | (41.60%) | 2.80% |  | 4.10%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets | $ 225.0 | $ 170.0 |  |
Deferred Tax Liabilities | (1,013.6) | (952.3) |  |
Property Related Temporary Differences | (763.3) | (708.6) |  |
Amounts Due from Customers for Future Federal Income Taxes | 96.0 | 111.5 |  |
Deferred State Income Taxes | (81.9) | (83.2) |  |
Regulatory Assets | (140.2) | (228.0) |  |
Net Operating Loss Carryforward | 25.8 | 111.4 |  |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward | 54.3 | 6.6 |  |
All Other, Net | 20.7 | 8.0 |  |
Net Deferred Tax Liabilities | (788.6) | (782.3) |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Income Tax Expense/Benefit | (49.2) | 4.1 |  | $ 5.2
Operating Income (Loss) | $ (180.8) | (192.9) |  | (175.9)
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 | $ (32.3) | (16.7) |  | (13.6)
Deferred | 13.4 | 26.2 |  | 19.6
Total Federal | (18.9) | 9.5 |  | 6.0
Current | (1.8) | 0.4 |  | (8.2)
Deferred | (4.5) | (10.5) |  | 11.6
Total State and Local | (6.3) | (10.1) |  | 3.4
Income Tax Expense (Benefit): |  |  |  |
Income Tax Expense/Benefit | (25.2) | (0.6) |  | 9.4
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Net Income | 294.3 | 242.1 |  | 183.7
Less: Equity Earnings | (1.4) | (3.4) |  | (2.9)
Income Tax Expense/Benefit | (25.2) | (0.6) |  | 9.4
Pretax Income | 267.7 | 238.1 |  | 190.2
Income Taxes on Pretax Income at Statutory Rate (21%) | $ 56.2 | $ 50.0 |  | $ 39.9
Federal Statutory Income Tax Rate | 21.00% | 21.00% |  | 21.00%
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |  |  |  |
Depreciation | $ 2.3 | $ 1.8 |  | $ 1.9
Depletion | (4.0) | (2.7) |  | (3.4)
Production Tax Credits | (57.1) | (7.2) |  | 0.0
State and Local Income Taxes, Net | (4.9) | (8.0) |  | 2.7
Parent Company Loss Benefit | 0.0 | 0.0 |  | (5.6)
Tax Reform Excess ADIT Reversal | (14.8) | (31.1) |  | (21.9)
Other | (2.9) | (3.4) |  | (4.2)
Income Tax Expense/Benefit | $ (25.2) | $ (0.6) |  | $ 9.4
Effective Income Tax Rate | (9.40%) | (0.30%) |  | 4.90%
Net Deferred Tax Liability and Significant Temporary Differences |  |  |  |
Deferred Tax Assets | $ 374.9 | $ 336.4 |  |
Deferred Tax Liabilities | (1,464.6) | (1,424.0) |  |
Property Related Temporary Differences | (1,053.8) | (989.6) |  |
Amounts Due from Customers for Future Federal Income Taxes | 146.2 | 154.8 |  |
Deferred State Income Taxes | (208.7) | (234.9) |  |
Regulatory Assets | (114.1) | (101.4) |  |
Net Operating Loss Carryforward | 42.7 | 67.4 |  |
Deferred Tax Assets, Tax Credit Carryforwards [Abstract] |  |  |  |
Tax Credit Carryforward | 66.0 | 8.5 |  |
All Other, Net | 32.0 | 7.6 |  |
Net Deferred Tax Liabilities | (1,089.7) | (1,087.6) |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Income Tax Expense/Benefit | (25.2) | (0.6) |  | $ 9.4
Operating Income (Loss) | $ (370.0) | (339.5) |  | (290.5)
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 | $ 224.4 |  |  |
Arkansas | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2023 |  |  |
Arkansas | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2032 |  |  |
Arkansas | Southwestern Electric Power Co [Member] | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2023 |  |  |
Arkansas | Southwestern Electric Power Co [Member] | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2032 |  |  |
Kentucky |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 231.3 |  |  |
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 | $ 586.8 |  |  |
Louisiana | Southwestern Electric Power Co [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | 577.2 |  |  |
Oklahoma |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 943.3 |  |  |
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 | AEP Transmission Co [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 33.0 |  |  |
Oklahoma | AEP Transmission Co [Member] | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2037 |  |  |
Oklahoma | AEP Transmission Co [Member] | 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 | $ 899.6 |  |  |
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 | $ 77.7 |  |  |
Tennessee | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2030 |  |  |
Tennessee | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2037 |  |  |
Virginia |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 11.2 |  |  |
Virginia | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2030 |  |  |
Virginia | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2037 |  |  |
West Virginia |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 12.3 |  |  |
West Virginia | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2029 |  |  |
West Virginia | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2037 |  |  |
Ohio Municipal |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 1,257.7 |  |  |
Ohio Municipal | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2023 |  |  |
Ohio Municipal | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2027 |  |  |
Ohio Municipal | Ohio Power Co [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 190.1 |  |  |
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, 2027 |  |  |
Colorado |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 82.6 |  |  |
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, 2042 |  |  |
Illinois |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 52.4 |  |  |
Federal |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount | 612.0 |  |  |
Federal | AEP Texas Inc. [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount | 1.5 |  |  |
Federal | AEP Transmission Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount | 0.2 |  |  |
Federal | Appalachian Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount | 2.0 |  |  |
Federal | Indiana Michigan Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount | 11.4 |  |  |
Federal | Ohio Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount | 1.0 |  |  |
Federal | Public Service Co Of Oklahoma [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount | 54.3 |  |  |
Federal | Southwestern Electric Power Co [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount | 66.0 |  |  |
State and Local Jurisdiction |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount | 39.2 |  |  |
State and Local Jurisdiction | AEP Texas Inc. [Member] |  |  |  |
Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward, Amount | 0.0 |  |  |
State and Local Jurisdiction | AEP Transmission Co [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 | 39.2 |  |  |
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 | $ 58.7 |  |  |
MICHIGAN | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2029 |  |  |
MICHIGAN | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2031 |  |  |
NEW JERSEY |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 13.7 |  |  |
NEW JERSEY | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2036 |  |  |
NEW JERSEY | Maximum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2040 |  |  |
NEW MEXICO |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 22.9 |  |  |
PENNSYLVANIA |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Net Income Tax Operating Loss Carryforward | $ 64.4 |  |  |
ILLINOIS | Minimum [Member] |  |  |  |
Net Income Tax Operating Loss Carryforwards |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2031 |  |  |
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 | $ 224.2 |  |  |
Dolet Hills Lignite Co, LLC [Member] |  |  |  |
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Less: Equity Earnings | (1.4) | (3.4) |  | (2.9)
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) | (3.4) |  | (2.9)
Investment funds | Ohio Power Co [Member] |  |  |  |
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |  |  |  |
Less: Equity Earnings | $ (0.6) | $ 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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