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Property, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 24,329.5 |  | $ 25,834.2 |
Property, Plant and Equipment, Transmission |  | 35,934.1 |  | 33,266.9 |
Property, Plant and Equipment, Distribution |  | 28,989.9 |  | 27,138.8 |
Property, Plant and Equipment, Other |  | 6,484.9 |  | 5,971.8 |
Property, Plant and Equipment, Construction Work in Progress |  | 5,508.0 |  | 4,809.7 |
Accumulated Depreciation |  | 24,553.0 |  | 23,682.3 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 76,693.4 |  | 73,339.1 |
Asset Retirement Obligations (ARO) |  |  |  |  |
Beginning Balance | [1],[2],[3],[4],[5],[6] | 2,943.6 |  | 2,741.7 |
Accretion Expense | [1],[2],[3],[4],[5],[6] | 116.3 |  | 111.2 |
Liabilities Incurred | [1],[2],[3],[4],[5],[6] | 38.9 |  | 37.4 |
Liabilities Settled | [1],[2],[3],[4],[5],[6] | (130.6) |  | (47.0) |
Revisions in Cash Flow Estimates | [1],[2],[3],[4],[5],[6],[7] | 63.0 |  | 100.3 |
Ending Balance | [1],[2],[3],[4],[5],[6] | 3,031.2 |  | 2,943.6 | $ 2,741.7
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant |  | 2,110.0 |  | 2,000.0 |
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 174.9 |  | 133.7 | 139.7
Allowance for Borrowed Funds Used During Construction |  | 117.3 |  | 63.0 | 53.8
Jointly-owned Electric Facilities |  |  |  |  |
Utility Plant in Service |  | 1,906.8 |  | 2,626.0 |
Construction Work in Progress |  | 11.7 |  | 21.5 |
Accumulated Depreciation |  | 490.8 |  | 1,096.1 |
Asset Impairments and Other Related Charges |  | 85.6 |  | 48.8 | 11.6
Competitive Contracted Renewable Portfolio |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |
Liabilities Settled |  | (31.0) |  |  |
AEP Texas Inc. [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Transmission |  | 6,812.6 |  | 6,301.5 |
Property, Plant and Equipment, Distribution |  | 5,798.8 |  | 5,312.8 |
Property, Plant and Equipment, Other |  | 1,145.9 |  | 1,022.8 |
Property, Plant and Equipment, Construction Work in Progress |  | 904.6 |  | 805.2 |
Accumulated Depreciation |  | 1,887.9 |  | 1,760.7 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 12,774.0 |  | 11,681.6 |
Asset Retirement Obligations (ARO) |  |  |  |  |
Beginning Balance | [3],[4] | 4.5 |  | 4.4 |
Accretion Expense | [3],[4] | 0.2 |  | 0.3 |
Liabilities Incurred | [3],[4] | 0.0 |  | 0.0 |
Liabilities Settled | [3],[4] | (0.3) |  | (0.2) |
Revisions in Cash Flow Estimates | [3],[4],[7] | 0.1 |  | 0.0 |
Ending Balance | [3],[4] | 4.5 |  | 4.5 | 4.4
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 28.4 |  | 19.7 | 21.5
Allowance for Borrowed Funds Used During Construction |  | 23.4 |  | 11.5 | 10.5
AEP Transmission Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Transmission |  | 13,723.9 |  | 12,335.4 |
Property, Plant and Equipment, Other |  | 501.4 |  | 476.8 |
Property, Plant and Equipment, Construction Work in Progress |  | 1,563.7 |  | 1,554.7 |
Accumulated Depreciation |  | 1,291.3 |  | 1,027.0 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 14,497.7 |  | 13,339.9 |
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 83.2 |  | 70.7 | 67.2
Allowance for Borrowed Funds Used During Construction |  | 31.4 |  | 22.4 | 21.0
Appalachian Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | 7,041.3 |  | 6,776.8 |
Property, Plant and Equipment, Transmission |  | 4,711.8 |  | 4,482.8 |
Property, Plant and Equipment, Distribution |  | 5,176.6 |  | 4,933.0 |
Property, Plant and Equipment, Other |  | 981.3 |  | 883.3 |
Property, Plant and Equipment, Construction Work in Progress |  | 709.2 |  | 705.3 |
Accumulated Depreciation |  | 5,688.7 |  | 5,402.0 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 12,931.5 |  | 12,379.2 |
Asset Retirement Obligations (ARO) |  |  |  |  |
Beginning Balance | [3],[4] | 427.7 |  | 404.6 |
Accretion Expense | [3],[4] | 16.8 |  | 15.8 |
Liabilities Incurred | [3],[4] | 16.1 |  | 3.0 |
Liabilities Settled | [3],[4] | (23.1) |  | (12.7) |
Revisions in Cash Flow Estimates | [3],[4],[7] | 26.5 |  | 17.0 |
Ending Balance | [3],[4] | 464.0 |  | 427.7 | 404.6
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 11.9 |  | 11.7 | 15.6
Allowance for Borrowed Funds Used During Construction |  | 14.1 |  | 6.5 | 7.5
Jointly-owned Electric Facilities |  |  |  |  |
Asset Impairments and Other Related Charges |  | 0.0 |  | 24.9 | 0.0
Indiana Michigan Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | 5,646.8 |  | 5,585.1 |
Property, Plant and Equipment, Transmission |  | 1,906.4 |  | 1,842.2 |
Property, Plant and Equipment, Distribution |  | 3,254.0 |  | 3,024.7 |
Property, Plant and Equipment, Other |  | 898.5 |  | 839.3 |
Property, Plant and Equipment, Construction Work in Progress |  | 301.7 |  | 253.0 |
Accumulated Depreciation |  | 4,378.4 |  | 4,132.8 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 7,629.0 |  | 7,411.5 |
Asset Retirement Obligations (ARO) |  |  |  |  |
Beginning Balance | [3],[4],[5] | 2,028.1 |  | 1,946.3 |
Accretion Expense | [3],[4],[5] | 74.8 |  | 71.5 |
Liabilities Incurred | [3],[4],[5] | 4.8 |  | 3.2 |
Liabilities Settled | [3],[4],[5] | (3.7) |  | (0.6) |
Revisions in Cash Flow Estimates | [3],[4],[5],[7] | 2.0 |  | 7.7 |
Ending Balance | [3],[4],[5] | 2,106.0 |  | 2,028.1 | 1,946.3
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant |  | 2,110.0 |  | 2,000.0 |
Fair Value of Legally Restricted Assets |  | 3,510.0 |  | 3,010.0 |
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 10.9 |  | 9.8 | 12.8
Allowance for Borrowed Funds Used During Construction |  | 7.7 |  | 5.7 | 5.1
Ohio Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Transmission |  | 3,395.1 |  | 3,198.6 |
Property, Plant and Equipment, Distribution |  | 6,839.4 |  | 6,450.3 |
Property, Plant and Equipment, Other |  | 1,125.0 |  | 1,051.4 |
Property, Plant and Equipment, Construction Work in Progress |  | 654.0 |  | 474.3 |
Accumulated Depreciation |  | 2,713.6 |  | 2,565.3 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 9,299.9 |  | 8,609.3 |
Asset Retirement Obligations (ARO) |  |  |  |  |
Beginning Balance | [4] | 5.0 |  | 1.9 |
Accretion Expense | [4] | 0.2 |  | 0.2 |
Liabilities Incurred | [4] | 0.0 |  | 3.0 |
Liabilities Settled | [4] | (3.1) |  | (0.1) |
Revisions in Cash Flow Estimates | [4],[7] | 0.0 |  | 0.0 |
Ending Balance | [4] | 2.1 |  | 5.0 | 1.9
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 17.1 |  | 13.9 | 10.8
Allowance for Borrowed Funds Used During Construction |  | 14.0 |  | 6.7 | 4.7
Public Service Co Of Oklahoma [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | 2,695.5 |  | 2,394.8 |
Property, Plant and Equipment, Transmission |  | 1,228.3 |  | 1,164.4 |
Property, Plant and Equipment, Distribution |  | 3,450.8 |  | 3,216.4 |
Property, Plant and Equipment, Other |  | 505.9 |  | 469.3 |
Property, Plant and Equipment, Construction Work in Progress |  | 313.7 |  | 219.3 |
Accumulated Depreciation |  | 2,081.9 |  | 1,837.7 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 6,112.3 |  | 5,626.5 |
Asset Retirement Obligations (ARO) |  |  |  |  |
Beginning Balance | [1],[3],[4] | 75.7 |  | 57.6 |
Accretion Expense | [1],[3],[4] | 4.7 |  | 4.1 |
Liabilities Incurred | [1],[3],[4] | 5.8 |  | 12.8 |
Liabilities Settled | [1],[3],[4] | (1.2) |  | (0.7) |
Revisions in Cash Flow Estimates | [1],[3],[4],[7] | (0.8) |  | 1.9 |
Ending Balance | [1],[3],[4] | 84.2 |  | 75.7 | 57.6
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 8.4 |  | 1.5 | 2.4
Allowance for Borrowed Funds Used During Construction |  | 5.2 |  | 2.7 | 0.7
Southwestern Electric Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | 4,790.7 |  | 5,476.2 |
Property, Plant and Equipment, Transmission |  | 2,660.6 |  | 2,479.8 |
Property, Plant and Equipment, Distribution |  | 2,824.1 |  | 2,659.6 |
Property, Plant and Equipment, Other |  | 814.4 |  | 804.4 |
Property, Plant and Equipment, Construction Work in Progress |  | 555.8 |  | 369.5 |
Accumulated Depreciation |  | 3,087.2 |  | 3,527.3 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 8,558.4 |  | 8,262.2 |
Asset Retirement Obligations (ARO) |  |  |  |  |
Beginning Balance | [1],[2],[3],[4] | 280.9 |  | 222.7 |
Accretion Expense | [1],[2],[3],[4] | 13.7 |  | 11.9 |
Liabilities Incurred | [1],[2],[3],[4] | 7.5 |  | 15.4 |
Liabilities Settled | [1],[2],[3],[4] | (55.0) |  | (25.8) |
Revisions in Cash Flow Estimates | [1],[2],[3],[4],[7] | 34.5 |  | 56.7 |
Ending Balance | [1],[2],[3],[4] | 281.6 |  | 280.9 | 222.7
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 11.5 |  | 4.9 | 7.0
Allowance for Borrowed Funds Used During Construction |  | 9.8 |  | 4.3 | 3.0
Jointly-owned Electric Facilities |  |  |  |  |
Utility Plant in Service |  | 2,993.1 |  | 3,692.8 |
Construction Work in Progress |  | 14.6 |  | 31.6 |
Accumulated Depreciation |  | 558.7 |  | 1,131.3 |
Asset Impairments and Other Related Charges |  | $ 85.6 |  | $ 0.0 | $ 11.6
Flint Creek Generating Station (Unit No. 1) [Member] | Coal [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership | [8] | 50.00% |  | 50.00% |
Utility Plant in Service | [8] | $ 402.8 |  | $ 382.9 |
Construction Work in Progress | [8] | 1.6 |  | 16.4 |
Accumulated Depreciation | [8] | $ 167.5 |  | $ 149.4 |
Flint Creek Generating Station (Unit No. 1) [Member] | Southwestern Electric Power Co [Member] | Coal [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership | [8] | 50.00% |  | 50.00% |
Utility Plant in Service | [8] | $ 402.8 |  | $ 382.9 |
Construction Work in Progress | [8] | 1.6 |  | 16.4 |
Accumulated Depreciation | [8] | $ 167.5 |  | $ 149.4 |
Pirkey Generating Station (Unit No. 1) [Member] | Public Utilities, Inventory, Lignite [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership | [8] | 85.90% | [9] | 85.90% |
Utility Plant in Service | [8] | $ 0.0 | [9] | $ 632.0 |
Construction Work in Progress | [8] | 0.0 | [9] | 0.0 |
Accumulated Depreciation | [8] | $ 0.0 | [9] | $ 632.0 |
Pirkey Generating Station (Unit No. 1) [Member] | Southwestern Electric Power Co [Member] | Public Utilities, Inventory, Lignite [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership | [8] | 85.90% | [9] | 85.90% |
Utility Plant in Service | [8] | $ 0.0 | [9] | $ 632.0 |
Construction Work in Progress | [8] | 0.0 | [9] | 0.0 |
Accumulated Depreciation | [8] | $ 0.0 | [9] | $ 632.0 |
Turk Generating Plant [Member] | Coal [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership | [8] | 73.30% | [10] | 73.30% |
Utility Plant in Service | [8] | $ 1,504.0 | [10] | $ 1,611.1 |
Construction Work in Progress | [8] | 10.1 | [10] | 5.1 |
Accumulated Depreciation | [8] | $ 323.3 | [10] | $ 314.7 |
Turk Generating Plant [Member] | Southwestern Electric Power Co [Member] | Coal [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership | [8] | 73.30% | [10] | 73.30% |
Utility Plant in Service | [8] | $ 1,504.0 | [10] | $ 1,611.1 |
Construction Work in Progress | [8] | 10.1 | [10] | 5.1 |
Accumulated Depreciation | [8] | $ 323.3 | [10] | $ 314.7 |
NCWF [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership |  | 45.50% |  |  |
NCWF [Member] | Public Service Co Of Oklahoma [Member] | Wind [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership | [11],[12] | 45.50% |  | 45.50% |
Utility Plant in Service | [11],[12] | $ 906.3 |  | $ 889.3 |
Construction Work in Progress | [11],[12] | 2.4 |  | 9.1 |
Accumulated Depreciation | [11],[12] | $ 54.1 |  | $ 28.1 |
NCWF [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership |  | 54.50% |  |  |
NCWF [Member] | Southwestern Electric Power Co [Member] | Wind [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership | [11],[12] | 54.50% |  | 54.50% |
Utility Plant in Service | [11],[12] | $ 1,086.3 |  | $ 1,066.8 |
Construction Work in Progress | [11],[12] | 2.9 |  | 10.1 |
Accumulated Depreciation | [11],[12] | $ 67.9 |  | $ 35.2 |
Rockport Generating Plant | Indiana Michigan Power Co [Member] | Coal [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership | [13],[14] | 50.00% |  | 50.00% |
Utility Plant in Service | [13],[14] | $ 1,341.4 |  | $ 1,357.4 |
Construction Work in Progress | [13],[14] | 7.9 |  | 9.2 |
Accumulated Depreciation | [13],[14] | $ 1,018.9 |  | 905.1 |
Rockport Generating Plant | AEP Generating Co [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Percent of Ownership |  | 50.00% |  |  |
Regulated Operation [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation | [15] | $ 23,862.7 |  | 23,759.7 |
Property, Plant and Equipment, Transmission |  | 35,903.6 |  | 33,221.7 |
Property, Plant and Equipment, Distribution |  | 28,989.9 |  | 27,138.8 |
Property, Plant and Equipment, Other |  | 5,986.1 |  | 5,528.9 |
Property, Plant and Equipment, Construction Work in Progress | [15] | 5,480.6 |  | 4,776.4 |
Accumulated Depreciation |  | 24,093.8 |  | 23,118.0 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 76,129.1 |  | $ 71,307.5 |
Regulated Operation [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 162 years |  | 132 years | 132 years
Depreciable Life Ranges - Transmission |  | 78 years |  | 75 years | 75 years
Depreciable Life Ranges - Distribution |  | 85 years |  | 78 years | 80 years
Depreciable Life Ranges - Other |  | 75 years |  | 75 years | 75 years
Regulated Operation [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 20 years |  | 20 years | 20 years
Depreciable Life Ranges - Transmission |  | 15 years |  | 24 years | 15 years
Depreciable Life Ranges - Distribution |  | 7 years |  | 7 years | 7 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years | 5 years
Regulated Operation [Member] | Generation [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 4.70% |  | 7.60% | 7.80%
Regulated Operation [Member] | Generation [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.70% |  | 2.70% | 2.70%
Regulated Operation [Member] | Transmission [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.70% |  | 2.70% | 2.60%
Regulated Operation [Member] | Transmission [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.00% |  | 2.00% | 2.00%
Regulated Operation [Member] | Distribution [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.60% |  | 3.60% | 3.60%
Regulated Operation [Member] | Distribution [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.90% |  | 2.70% | 2.80%
Regulated Operation [Member] | Other Property Class [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 9.10% |  | 14.40% | 12.50%
Regulated Operation [Member] | Other Property Class [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.80% |  | 3.10% | 3.00%
Regulated Operation [Member] | AEP Texas Inc. [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 0.0 |  | $ 0.0 |
Property, Plant and Equipment, Transmission |  | 6,812.6 |  | 6,301.5 |
Property, Plant and Equipment, Distribution |  | 5,798.8 |  | 5,312.8 |
Property, Plant and Equipment, Other |  | 1,142.9 |  | 1,020.4 |
Property, Plant and Equipment, Construction Work in Progress |  | 904.6 |  | 805.2 |
Accumulated Depreciation |  | 1,886.7 |  | 1,759.5 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 12,772.2 |  | $ 11,680.4 |
Regulated Operation [Member] | AEP Texas Inc. [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 75 years |  | 75 years | 75 years
Depreciable Life Ranges - Distribution |  | 70 years |  | 70 years | 70 years
Depreciable Life Ranges - Other |  | 50 years |  | 50 years | 50 years
Regulated Operation [Member] | AEP Texas Inc. [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 50 years |  | 50 years | 50 years
Depreciable Life Ranges - Distribution |  | 7 years |  | 7 years | 7 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years | 5 years
Regulated Operation [Member] | AEP Texas Inc. [Member] | Transmission [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.20% |  | 2.20% | 2.20%
Regulated Operation [Member] | AEP Texas Inc. [Member] | Distribution [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.90% |  | 2.90% | 2.90%
Regulated Operation [Member] | AEP Texas Inc. [Member] | Other Property Class [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 6.00% |  | 6.20% | 5.80%
Regulated Operation [Member] | AEP Transmission Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 0.0 |  | $ 0.0 |
Property, Plant and Equipment, Transmission |  | 13,723.9 |  | 12,335.4 |
Property, Plant and Equipment, Distribution |  | 0.0 |  | 0.0 |
Property, Plant and Equipment, Other |  | 501.2 |  | 476.6 |
Property, Plant and Equipment, Construction Work in Progress |  | 1,563.7 |  | 1,554.7 |
Accumulated Depreciation |  | 1,291.4 |  | 1,027.1 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 14,497.4 |  | $ 13,339.6 |
Regulated Operation [Member] | AEP Transmission Co [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 78 years |  | 75 years | 75 years
Depreciable Life Ranges - Other |  | 58 years |  | 56 years | 56 years
Regulated Operation [Member] | AEP Transmission Co [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 24 years |  | 24 years | 24 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years | 5 years
Regulated Operation [Member] | AEP Transmission Co [Member] | Transmission [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.60% |  | 2.60% | 2.50%
Regulated Operation [Member] | AEP Transmission Co [Member] | Other Property Class [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 7.00% |  | 6.60% | 6.70%
Regulated Operation [Member] | Appalachian Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 7,041.3 |  | $ 6,776.8 |
Property, Plant and Equipment, Transmission |  | 4,711.8 |  | 4,482.8 |
Property, Plant and Equipment, Distribution |  | 5,176.6 |  | 4,933.0 |
Property, Plant and Equipment, Other |  | 943.7 |  | 849.2 |
Property, Plant and Equipment, Construction Work in Progress |  | 709.2 |  | 705.3 |
Accumulated Depreciation |  | 5,684.0 |  | 5,397.3 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 12,898.6 |  | $ 12,349.8 |
Regulated Operation [Member] | Appalachian Power Co [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 162 years |  | 118 years | 118 years
Depreciable Life Ranges - Transmission |  | 78 years |  | 75 years | 75 years
Depreciable Life Ranges - Distribution |  | 60 years |  | 57 years | 57 years
Depreciable Life Ranges - Other |  | 55 years |  | 55 years | 55 years
Regulated Operation [Member] | Appalachian Power Co [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 35 years |  | 35 years | 35 years
Depreciable Life Ranges - Transmission |  | 15 years |  | 24 years | 15 years
Depreciable Life Ranges - Distribution |  | 12 years |  | 12 years | 12 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years | 5 years
Regulated Operation [Member] | Appalachian Power Co [Member] | Generation [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.30% |  | 3.60% | 3.60%
Regulated Operation [Member] | Appalachian Power Co [Member] | Transmission [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.30% |  | 2.20% | 2.10%
Regulated Operation [Member] | Appalachian Power Co [Member] | Distribution [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.60% |  | 3.60% | 3.50%
Regulated Operation [Member] | Appalachian Power Co [Member] | Other Property Class [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 7.40% |  | 7.30% | 8.50%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 5,588.7 |  | $ 5,534.6 |
Property, Plant and Equipment, Transmission |  | 1,906.4 |  | 1,842.2 |
Property, Plant and Equipment, Distribution |  | 3,254.0 |  | 3,024.7 |
Property, Plant and Equipment, Other |  | 856.8 |  | 796.1 |
Property, Plant and Equipment, Construction Work in Progress |  | 294.1 |  | 253.0 |
Accumulated Depreciation |  | 4,353.7 |  | 4,117.8 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 7,546.3 |  | $ 7,332.8 |
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 132 years |  | 132 years | 132 years
Depreciable Life Ranges - Transmission |  | 67 years |  | 67 years | 70 years
Depreciable Life Ranges - Distribution |  | 71 years |  | 71 years | 71 years
Depreciable Life Ranges - Other |  | 45 years |  | 45 years | 51 years
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 20 years |  | 20 years | 20 years
Depreciable Life Ranges - Transmission |  | 44 years |  | 44 years | 45 years
Depreciable Life Ranges - Distribution |  | 14 years |  | 14 years | 14 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years | 5 years
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Generation [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 4.70% |  | 4.90% | 4.70%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Transmission [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.50% |  | 2.50% | 2.40%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Distribution [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.90% |  | 3.10% | 3.40%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Other Property Class [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 9.10% |  | 10.10% | 9.00%
Regulated Operation [Member] | Ohio Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 0.0 |  | $ 0.0 |
Property, Plant and Equipment, Transmission |  | 3,395.1 |  | 3,198.6 |
Property, Plant and Equipment, Distribution |  | 6,839.4 |  | 6,450.3 |
Property, Plant and Equipment, Other |  | 1,114.4 |  | 1,040.6 |
Property, Plant and Equipment, Construction Work in Progress |  | 654.0 |  | 474.3 |
Accumulated Depreciation |  | 2,712.7 |  | 2,564.3 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 9,290.2 |  | $ 8,599.5 |
Regulated Operation [Member] | Ohio Power Co [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 60 years |  | 60 years | 60 years
Depreciable Life Ranges - Distribution |  | 70 years |  | 70 years | 70 years
Depreciable Life Ranges - Other |  | 50 years |  | 50 years | 50 years
Regulated Operation [Member] | Ohio Power Co [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 39 years |  | 39 years | 39 years
Depreciable Life Ranges - Distribution |  | 11 years |  | 11 years | 11 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years | 5 years
Regulated Operation [Member] | Ohio Power Co [Member] | Transmission [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.30% |  | 2.30% | 2.30%
Regulated Operation [Member] | Ohio Power Co [Member] | Distribution [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.10% |  | 2.70% | 2.90%
Regulated Operation [Member] | Ohio Power Co [Member] | Other Property Class [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 6.40% |  | 6.10% | 6.10%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 2,695.5 |  | $ 2,394.8 |
Property, Plant and Equipment, Transmission |  | 1,228.3 |  | 1,164.4 |
Property, Plant and Equipment, Distribution |  | 3,450.8 |  | 3,216.4 |
Property, Plant and Equipment, Other |  | 502.7 |  | 466.0 |
Property, Plant and Equipment, Construction Work in Progress |  | 313.7 |  | 219.3 |
Accumulated Depreciation |  | 2,083.6 |  | 1,839.4 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 6,107.4 |  | $ 5,621.5 |
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 75 years |  | 75 years | 75 years
Depreciable Life Ranges - Transmission |  | 75 years |  | 75 years | 75 years
Depreciable Life Ranges - Distribution |  | 85 years |  | 78 years | 78 years
Depreciable Life Ranges - Other |  | 58 years |  | 56 years | 56 years
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 25 years |  | 30 years | 30 years
Depreciable Life Ranges - Transmission |  | 41 years |  | 42 years | 42 years
Depreciable Life Ranges - Distribution |  | 15 years |  | 15 years | 15 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years | 5 years
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Generation [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.00% |  | 3.10% | 2.80%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Transmission [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.60% |  | 2.50% | 2.40%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Distribution [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.90% |  | 2.90% | 2.90%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Other Property Class [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 6.80% |  | 6.80% | 6.10%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Property, Plant and Equipment, Generation | [15] | $ 4,790.7 |  | $ 5,476.2 |
Property, Plant and Equipment, Transmission |  | 2,660.6 |  | 2,479.8 |
Property, Plant and Equipment, Distribution |  | 2,824.1 |  | 2,659.6 |
Property, Plant and Equipment, Other |  | 544.1 |  | 582.6 |
Property, Plant and Equipment, Construction Work in Progress | [15] | 555.8 |  | 369.5 |
Accumulated Depreciation |  | 2,840.8 |  | 3,314.8 |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 8,534.5 |  | $ 8,252.9 |
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 65 years |  | 65 years | 65 years
Depreciable Life Ranges - Transmission |  | 70 years |  | 70 years | 74 years
Depreciable Life Ranges - Distribution |  | 75 years |  | 75 years | 80 years
Depreciable Life Ranges - Other |  | 58 years |  | 57 years | 58 years
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 30 years |  | 30 years | 30 years
Depreciable Life Ranges - Transmission |  | 46 years |  | 44 years | 49 years
Depreciable Life Ranges - Distribution |  | 7 years |  | 15 years | 15 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years | 5 years
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Generation [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.90% |  | 2.70% | 2.70%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Transmission [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.20% |  | 2.30% | 2.40%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Distribution [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.90% |  | 2.90% | 2.80%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Other Property Class [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 8.50% |  | 9.00% | 8.60%
Unregulated Operation [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 564.3 |  | $ 2,031.6 |
Unregulated Operation [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 61 years |  | 61 years | 59 years
Depreciable Life Ranges - Transmission |  |  |  | 62 years | 40 years
Depreciable Life Ranges - Other | [16] | 35 years |  | 35 years | 35 years
Unregulated Operation [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Depreciable Life Ranges - Generation |  | 10 years |  | 3 years | 10 years
Depreciable Life Ranges - Transmission |  | 62 years |  | 10 years | 30 years
Depreciable Life Ranges - Other | [16] | 5 years |  | 5 years | 5 years
Unregulated Operation [Member] | Generation [Member] | Maximum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 6.70% |  | 8.70% | 10.40%
Unregulated Operation [Member] | Generation [Member] | Minimum [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 4.80% |  | 3.80% | 3.80%
Unregulated Operation [Member] | Transmission [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.50% |  | 2.80% | 2.60%
Unregulated Operation [Member] | Other Property Class [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
Annual Composite Depreciation Rate |  | 10.60% |  | 25.20% | 16.50%
Unregulated Operation [Member] | AEP Texas Inc. [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 1.8 |  | $ 1.2 |
Unregulated Operation [Member] | AEP Transmission Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 0.3 |  | 0.3 |
Unregulated Operation [Member] | Appalachian Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 32.9 |  | 29.4 |
Unregulated Operation [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 82.7 |  | 78.7 |
Unregulated Operation [Member] | Ohio Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 9.7 |  | 9.8 |
Unregulated Operation [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 4.9 |  | 5.0 |
Unregulated Operation [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 23.9 |  | 9.3 |
Cook Nuclear Plant [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant |  | 2,110.0 |  | 2,000.0 |
Amos Plant | Appalachian Power Co [Member] |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |
Revisions in Cash Flow Estimates |  |  |  | 14.0 |
Traverse [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |
Liabilities Incurred |  |  |  | 13.0 |
Traverse [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |
Liabilities Incurred |  |  |  | 15.0 |
Pirkey Power Plant | Southwestern Electric Power Co [Member] |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |
Revisions in Cash Flow Estimates |  |  |  | 13.0 |
Sabine Mining Co [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |
Property, Plant and Equipment (Textuals) |  |  |  |  |
Asset Retirement Obligation, Revision of Estimate, Estimated Reclamation Costs - 1 |  | 32.0 |  | 16.0 |
Asset Retirement Obligation, Revision of Estimate, Estimated Reclamation Costs - 2 |  |  |  | 7.0 |
Pirkey Power Plant | Southwestern Electric Power Co [Member] |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |
Revisions in Cash Flow Estimates |  |  |  | 14.0 |
Pirkey Power Plant and Dolet Hills Power Station | Southwestern Electric Power Co [Member] |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |
Liabilities Settled |  | (50.0) |  |  |
Various Plants | Appalachian Power Co [Member] |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |
Revisions in Cash Flow Estimates |  | 27.0 |  |  |
Generation and Marketing [Member] |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |
Asset Impairments and Other Related Charges |  | $ 0.0 |  | $ 0.0 | $ 0.0
[1] | Includes ARO related to wind farms.
[2] | Includes ARO related to Sabine and DHLC.
[3] | Includes ARO related to ash disposal facilities.
[4] | Includes ARO related to asbestos removal.
[5] | Includes ARO related to nuclear decommissioning costs for the Cook Plant of $2.11 billion and $2 billion as of December 31, 2023 and 2022, respectively.
[6] | Includes ARO related to solar farms.
[7] | Unless discussed above, primarily related to ash ponds, landfills and mine reclamation, generally due to changes in estimated closure area, volumes and/or unit costs.
[8] | Operated by SWEPCo.
[9] | Pirkey Plant was retired in March 2023. See "Coal-Fired Generation Plants" of Note 5 for additional information.
[10] | Includes impact of regulatory disallowance of AFUDC. See “2012 Texas Base Rate Case” section of Note 4 for additional information.
[11] | Operated by PSO.
[12] | PSO and SWEPCo own undivided interests of 45.5% and 54.5% of the NCWF, respectively.
[13] | Operated by I&M.
[14] | AEGCo owns 50%.
[15] | AEP and SWEPCo’s regulated generation and regulated CWIP include amounts related to SWEPCo’s Arkansas jurisdictional share of the Turk Plant.
[16] | In 2020, management announced plans to retire the Pirkey Plant in 2023 and the related depreciable lives have been adjusted accordingly. Pirkey Plant was retired in March 2023. See "Coal-Fired Generation Plants" of Note 5 for additional information.

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