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Derivatives and Hedging (Details) gal in Millions, MWh in Millions, MMBTU in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) MWh MMBTU gal | Dec. 31, 2022 USD ($) MMBTU MWh gal | Dec. 31, 2021 USD ($)
Cash Collateral Netting |  |  |  |  |  |
Cash Collateral Received Netted Against Risk Management Assets |  | $ 46,000,000 |  | $ 481,000,000 |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 217,500,000 |  | 348,800,000 |  |
Derivative Asset, Noncurrent |  | 321,200,000 |  | 284,100,000 |  |
Total Assets |  | 538,700,000 |  | 632,900,000 |  |
Current Risk Management Liabilities |  | 229,600,000 |  | 145,200,000 |  |
Derivative Liability, Noncurrent |  | 241,800,000 |  | 345,200,000 |  |
Total Liabilities |  | 471,400,000 |  | 490,400,000 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (322,800,000) |  | 693,700,000 |  | $ 324,000,000.0
Impact of Fair Value Hedges on the Balance Sheet |  |  |  |  |  |
Carrying Amount of Hedged Asset (Liability) | [1],[2] | (878,200,000) |  | (855,500,000) |  |
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability) | [1],[2] | 68,400,000 |  | 89,700,000 |  |
Gain (Loss) on Hedging Instruments |  |  |  |  |  |
Gain (Loss) on Fair Value Instruments | [3] | 29,000,000.0 |  | (90,400,000) |  | (35,500,000)
Gain (Loss) on Fair Value Portion of Long Term Debt | [3] | (29,000,000.0) |  | 90,400,000 |  | 35,500,000
Collateral Triggering Events |  |  |  |  |  |
Fair Value Of Derivative Liabilities Subject To Cross Acceleration Provisions |  | 107,000,000 |  | 127,000,000 |  |
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements |  | 242,000,000 |  | 217,000,000 |  |
Derivatives and Hedging (Textuals) |  |  |  |  |  |
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) |  | (30,000,000) |  | (38,000,000) |  |
Credit Downgrade Trigger Exposure |  | 0 |  | 2,000,000 |  |
AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Liabilities |  | 2,700,000 |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (600,000) |  | 2,800,000 |  | 2,000,000.0
Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 22,400,000 |  | 69,100,000 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (18,600,000) |  | 88,600,000 |  | 55,300,000
Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 27,800,000 |  | 15,200,000 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 29,200,000 |  | 19,600,000 |  | (18,200,000)
Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Liabilities |  | 6,800,000 |  | 1,800,000 |  |
Derivative Liability, Noncurrent |  | 43,900,000 |  | 37,900,000 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (14,100,000) |  | 57,800,000 |  | 11,100,000
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 19,000,000.0 |  | 25,300,000 |  |
Current Risk Management Liabilities |  | 28,900,000 |  | 1,600,000 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 58,800,000 |  | 103,700,000 |  | 46,000,000.0
Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 11,600,000 |  | 16,400,000 |  |
Current Risk Management Liabilities |  | 14,400,000 |  | 1,400,000 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 55,000,000.0 |  | 77,700,000 |  | 41,500,000
Risk Management Contracts [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets | [5] | 403,900,000 | [4] | 315,400,000 | [6] |
Total Liabilities | [5] | 362,300,000 | [4] | 339,800,000 | [6] |
Risk Management Contracts [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Liabilities | [5] | 0 |  |  |  |
Risk Management Contracts [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets | [5] | 22,400,000 |  | 69,100,000 |  |
Total Liabilities | [5] | 22,500,000 |  | 3,500,000 |  |
Risk Management Contracts [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets | [5] | 39,600,000 |  | 15,400,000 |  |
Total Liabilities | [5] | 2,000,000.0 |  | 0 |  |
Risk Management Contracts [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Liabilities | [5] | 50,700,000 |  | 39,700,000 |  |
Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets | [5] | 19,000,000.0 |  | 25,300,000 |  |
Total Liabilities | [5] | 29,900,000 |  | 1,600,000 |  |
Risk Management Contracts [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets | [5] | 11,600,000 |  | 16,400,000 |  |
Total Liabilities | [5] | 15,600,000 |  | 1,400,000 |  |
Commodity [Member] |  |  |  |  |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 104,900,000 |  | 223,500,000 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | $ 38,300,000 |  | 119,900,000 |  |
Derivatives and Hedging (Textuals) |  |  |  |  |  |
Maximum Length of Time Hedged in Price Risk Cash Flow Hedge |  | 87 months |  |  |  |
Cross Default Provisions Maximum Third Party Obligation Amount |  | $ 50,000,000 |  |  |  |
Cross Acceleration Provisions Maximum Third Party Obligation Amount |  | 50,000,000 |  |  |  |
Commodity [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 0 |  | 0 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 0 |  | 0 |  |
Commodity [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 0 |  | 0 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 0 |  | 0 |  |
Commodity [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 0 |  | 0 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 0 |  | 0 |  |
Commodity [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 0 |  | 0 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 0 |  | 0 |  |
Commodity [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 0 |  | 0 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 0 |  | 0 |  |
Commodity [Member] | Risk Management Contracts [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 555,100,000 |  | 965,400,000 |  |
Derivative Asset, Noncurrent |  | 468,800,000 |  | 565,600,000 |  |
Current Risk Management Liabilities |  | 588,000,000.0 |  | 663,800,000 |  |
Derivative Liability, Noncurrent |  | 377,600,000 |  | 412,000,000.0 |  |
Commodity [Member] | Risk Management Contracts [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 200,000 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Commodity [Member] | Risk Management Contracts [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 24,600,000 |  | 69,300,000 |  |
Derivative Asset, Noncurrent |  | 300,000 |  | 700,000 |  |
Current Risk Management Liabilities |  | 18,500,000 |  | 4,100,000 |  |
Derivative Liability, Noncurrent |  | 6,900,000 |  | 700,000 |  |
Commodity [Member] | Risk Management Contracts [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 30,100,000 |  | 16,000,000.0 |  |
Derivative Asset, Noncurrent |  | 12,000,000.0 |  | 500,000 |  |
Current Risk Management Liabilities |  | 5,400,000 |  | 900,000 |  |
Derivative Liability, Noncurrent |  | 200,000 |  | 300,000 |  |
Commodity [Member] | Risk Management Contracts [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 6,900,000 |  | 2,100,000 |  |
Derivative Liability, Noncurrent |  | 43,900,000 |  | 37,900,000 |  |
Commodity [Member] | Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 19,700,000 |  | 24,100,000 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 29,700,000 |  | 2,100,000 |  |
Derivative Liability, Noncurrent |  | 1,000,000.0 |  | 0 |  |
Commodity [Member] | Risk Management Contracts [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 12,000,000.0 |  | 16,800,000 |  |
Derivative Asset, Noncurrent |  | 500,000 |  | 0 |  |
Current Risk Management Liabilities |  | 14,900,000 |  | 2,000,000.0 |  |
Derivative Liability, Noncurrent |  | 1,700,000 |  | 0 |  |
Commodity [Member] | Hedging Contracts [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 56,700,000 |  | 212,200,000 |  |
Derivative Asset, Noncurrent |  | 86,800,000 |  | 148,900,000 |  |
Current Risk Management Liabilities |  | 8,200,000 |  | 60,400,000 |  |
Derivative Liability, Noncurrent |  | 2,200,000 |  | 17,400,000 |  |
Commodity [Member] | Hedging Contracts [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Commodity [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Commodity [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Commodity [Member] | Hedging Contracts [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Commodity [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Commodity [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Interest Rate [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 1,300,000,000 |  | 1,650,000,000 |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | (8,100,000) |  | 300,000 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 3,200,000 |  | 300,000 |  |
Interest Rate [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 150,000,000.0 |  | 0 |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 500,000 |  | (300,000) |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 200,000 |  | (200,000) |  |
Interest Rate [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0 |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 5,900,000 |  | 6,700,000 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 800,000 |  | 800,000 |  |
Interest Rate [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0 |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | (5,500,000) |  | (5,100,000) |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | (400,000) |  | (600,000) |  |
Interest Rate [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0 |  |
Interest Rate [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 200,000,000.0 |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | (200,000) |  | 1,300,000 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 0 |  | 100,000 |  |
Interest Rate [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0 |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 1,300,000 |  | 1,100,000 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 300,000 |  | 200,000 |  |
Interest Rate [Member] | Hedging Contracts [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 1,800,000 |  |
Derivative Asset, Noncurrent |  | 0 |  | 14,300,000 |  |
Current Risk Management Liabilities |  | 50,500,000 |  | 41,400,000 |  |
Derivative Liability, Noncurrent |  | 56,900,000 |  | 91,100,000 |  |
Interest Rate [Member] | Hedging Contracts [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 2,700,000 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Interest Rate [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Interest Rate [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Interest Rate [Member] | Hedging Contracts [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Interest Rate [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 1,600,000 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Interest Rate [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 611,800,000 |  | 1,179,400,000 |  |
Derivative Asset, Noncurrent |  | 555,600,000 |  | 728,800,000 |  |
Total Assets |  | 1,167,400,000 |  | 1,908,200,000 |  |
Current Risk Management Liabilities |  | 646,700,000 |  | 765,600,000 |  |
Derivative Liability, Noncurrent |  | 436,700,000 |  | 520,500,000 |  |
Total Liabilities |  | 1,083,400,000 |  | 1,286,100,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | 84,000,000.0 |  | 622,100,000 |  |
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Total Assets |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 2,900,000 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Total Liabilities |  | 2,900,000 |  | 0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | (2,900,000) |  | 0 |  |
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 24,600,000 |  | 69,300,000 |  |
Derivative Asset, Noncurrent |  | 300,000 |  | 700,000 |  |
Total Assets |  | 24,900,000 |  | 70,000,000.0 |  |
Current Risk Management Liabilities |  | 18,500,000 |  | 4,100,000 |  |
Derivative Liability, Noncurrent |  | 6,900,000 |  | 700,000 |  |
Total Liabilities |  | 25,400,000 |  | 4,800,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | (500,000) |  | 65,200,000 |  |
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 30,100,000 |  | 16,000,000.0 |  |
Derivative Asset, Noncurrent |  | 12,000,000.0 |  | 500,000 |  |
Total Assets |  | 42,100,000 |  | 16,500,000 |  |
Current Risk Management Liabilities |  | 5,400,000 |  | 900,000 |  |
Derivative Liability, Noncurrent |  | 200,000 |  | 300,000 |  |
Total Liabilities |  | 5,600,000 |  | 1,200,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | 36,500,000 |  | 15,300,000 |  |
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Total Assets |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 6,900,000 |  | 2,100,000 |  |
Derivative Liability, Noncurrent |  | 43,900,000 |  | 37,900,000 |  |
Total Liabilities |  | 50,800,000 |  | 40,000,000.0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | (50,800,000) |  | (40,000,000.0) |  |
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 19,700,000 |  | 25,700,000 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Total Assets |  | 19,700,000 |  | 25,700,000 |  |
Current Risk Management Liabilities |  | 29,700,000 |  | 2,100,000 |  |
Derivative Liability, Noncurrent |  | 1,000,000.0 |  | 0 |  |
Total Liabilities |  | 30,700,000 |  | 2,100,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | (11,000,000.0) |  | 23,600,000 |  |
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 12,000,000.0 |  | 16,800,000 |  |
Derivative Asset, Noncurrent |  | 500,000 |  | 0 |  |
Total Assets |  | 12,500,000 |  | 16,800,000 |  |
Current Risk Management Liabilities |  | 14,900,000 |  | 2,000,000.0 |  |
Derivative Liability, Noncurrent |  | 1,700,000 |  | 0 |  |
Total Liabilities |  | 16,600,000 |  | 2,000,000.0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | (4,100,000) |  | 14,800,000 |  |
Gross Amounts Offset in the Statement of Financial Position [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | (394,300,000) |  | (830,600,000) |  |
Derivative Asset, Noncurrent |  | (234,400,000) |  | (444,700,000) |  |
Current Risk Management Liabilities |  | (417,100,000) |  | (620,400,000) |  |
Derivative Liability, Noncurrent |  | (194,900,000) |  | (175,300,000) |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | (200,000) |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | (2,200,000) |  | (200,000) |  |
Derivative Asset, Noncurrent |  | (300,000) |  | (700,000) |  |
Current Risk Management Liabilities |  | (2,600,000) |  | (500,000) |  |
Derivative Liability, Noncurrent |  | (300,000) |  | (600,000) |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | (2,300,000) |  | (800,000) |  |
Derivative Asset, Noncurrent |  | (200,000) |  | (300,000) |  |
Current Risk Management Liabilities |  | (3,400,000) |  | (900,000) |  |
Derivative Liability, Noncurrent |  | (200,000) |  | (300,000) |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | (100,000) |  | (300,000) |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | (700,000) |  | (400,000) |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | (800,000) |  | (500,000) |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | (400,000) |  | (400,000) |  |
Derivative Asset, Noncurrent |  | (500,000) |  | 0 |  |
Current Risk Management Liabilities |  | (500,000) |  | (600,000) |  |
Derivative Liability, Noncurrent |  | (500,000) |  | 0 |  |
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 217,500,000 |  | 348,800,000 |  |
Derivative Asset, Noncurrent |  | 321,200,000 |  | 284,100,000 |  |
Total Assets |  | 538,700,000 |  | 632,900,000 |  |
Current Risk Management Liabilities |  | 229,600,000 |  | 145,200,000 |  |
Derivative Liability, Noncurrent |  | 241,800,000 |  | 345,200,000 |  |
Total Liabilities |  | 471,400,000 |  | 490,400,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | 67,300,000 |  | 142,500,000 |  |
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Total Assets |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 2,700,000 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Total Liabilities |  | 2,700,000 |  | 0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | (2,700,000) |  | 0 |  |
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 22,400,000 |  | 69,100,000 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Total Assets |  | 22,400,000 |  | 69,100,000 |  |
Current Risk Management Liabilities |  | 15,900,000 |  | 3,600,000 |  |
Derivative Liability, Noncurrent |  | 6,600,000 |  | 100,000 |  |
Total Liabilities |  | 22,500,000 |  | 3,700,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | (100,000) |  | 65,400,000 |  |
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 27,800,000 |  | 15,200,000 |  |
Derivative Asset, Noncurrent |  | 11,800,000 |  | 200,000 |  |
Total Assets |  | 39,600,000 |  | 15,400,000 |  |
Current Risk Management Liabilities |  | 2,000,000.0 |  | 0 |  |
Derivative Liability, Noncurrent |  | 0 |  | 0 |  |
Total Liabilities |  | 2,000,000.0 |  | 0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | 37,600,000 |  | 15,400,000 |  |
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 0 |  | 0 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Total Assets |  | 0 |  | 0 |  |
Current Risk Management Liabilities |  | 6,800,000 |  | 1,800,000 |  |
Derivative Liability, Noncurrent |  | 43,900,000 |  | 37,900,000 |  |
Total Liabilities |  | 50,700,000 |  | 39,700,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | (50,700,000) |  | (39,700,000) |  |
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 19,000,000.0 |  | 25,300,000 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Total Assets |  | 19,000,000.0 |  | 25,300,000 |  |
Current Risk Management Liabilities |  | 28,900,000 |  | 1,600,000 |  |
Derivative Liability, Noncurrent |  | 1,000,000.0 |  | 0 |  |
Total Liabilities |  | 29,900,000 |  | 1,600,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | (10,900,000) |  | 23,700,000 |  |
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 11,600,000 |  | 16,400,000 |  |
Derivative Asset, Noncurrent |  | 0 |  | 0 |  |
Total Assets |  | 11,600,000 |  | 16,400,000 |  |
Current Risk Management Liabilities |  | 14,400,000 |  | 1,400,000 |  |
Derivative Liability, Noncurrent |  | 1,200,000 |  | 0 |  |
Total Liabilities |  | 15,600,000 |  | 1,400,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | $ (4,000,000.0) |  | $ 15,000,000.0 |  |
Power [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 246.8 |  | 226.8 |  |
Power [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 0.0 |  | 0.0 |  |
Power [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 16.8 |  | 17.9 |  |
Power [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 5.9 |  | 4.2 |  |
Power [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 2.2 |  | 2.5 |  |
Power [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 4.1 |  | 2.9 |  |
Power [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 2.9 |  | 2.2 |  |
Natural Gas [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MMBTU |  | 151.6 |  | 77.1 |  |
Natural Gas [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MMBTU |  | 0.0 |  | 0.0 |  |
Natural Gas [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MMBTU |  | 37.3 |  | 1.9 |  |
Natural Gas [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MMBTU |  | 0.0 |  | 0.0 |  |
Natural Gas [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MMBTU |  | 0.0 |  | 0.0 |  |
Natural Gas [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MMBTU |  | 34.9 |  | 1.9 |  |
Natural Gas [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MMBTU |  | 17.9 |  | 2.1 |  |
Heating Oil and Gasoline [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 6.5 |  | 6.9 |  |
Heating Oil and Gasoline [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 1.8 |  | 1.9 |  |
Heating Oil and Gasoline [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 1.0 |  | 1.0 |  |
Heating Oil and Gasoline [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 0.6 |  | 0.7 |  |
Heating Oil and Gasoline [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 1.2 |  | 1.4 |  |
Heating Oil and Gasoline [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 0.7 |  | 0.9 |  |
Heating Oil and Gasoline [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 0.9 |  | 1.0 |  |
Interest Rate Contract [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | $ 80,100,000 |  | $ 99,900,000 |  |
Interest Rate Contract [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0 |  |
Interest Rate Contract [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0 |  |
Interest Rate Contract [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0 |  |
Interest Rate Contract [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0 |  |
Interest Rate Contract [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0 |  |
Interest Rate Contract [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0 |  |
Vertically Integrated Utilities Revenues [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 24,600,000 |  | 11,100,000 |  | (600,000)
Vertically Integrated Utilities Revenues [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Vertically Integrated Utilities Revenues [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Vertically Integrated Utilities Revenues [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Vertically Integrated Utilities Revenues [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Vertically Integrated Utilities Revenues [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Vertically Integrated Utilities Revenues [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Generation and Marketing Revenues [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (423,800,000) |  | 313,800,000 |  | 169,100,000
Generation and Marketing Revenues [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Generation and Marketing Revenues [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Generation and Marketing Revenues [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Generation and Marketing Revenues [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Generation and Marketing Revenues [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Generation and Marketing Revenues [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Electric Generation, Transmission and Distribution Revenues [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Electric Generation, Transmission and Distribution Revenues [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Electric Generation, Transmission and Distribution Revenues [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 100,000 |  | 500,000 |  | (500,000)
Electric Generation, Transmission and Distribution Revenues [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 24,500,000 |  | 10,600,000 |  | (100,000)
Electric Generation, Transmission and Distribution Revenues [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Electric Generation, Transmission and Distribution Revenues [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Electric Generation, Transmission and Distribution Revenues [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 2,500,000 |  | 5,000,000.0 |  | 2,000,000.0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | AEP Texas Inc. [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | Appalachian Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 2,300,000 |  | 4,500,000 |  | 1,800,000
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 100,000 |  | 100,000 |  | 0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | Ohio Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 200,000 |  | 0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 0 |  | 0
Other Operation Expense [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (200,000) |  | 4,800,000 |  | 2,800,000
Other Operation Expense [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (100,000) |  | 1,500,000 |  | 800,000
Other Operation Expense [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 400,000 |  | 300,000
Other Operation Expense [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 500,000 |  | 300,000
Other Operation Expense [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 800,000 |  | 500,000
Other Operation Expense [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 600,000 |  | 300,000
Other Operation Expense [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 0 |  | 800,000 |  | 400,000
Maintenance Expense [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (800,000) |  | 6,700,000 |  | 3,400,000
Maintenance Expense [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (300,000) |  | 1,800,000 |  | 1,000,000.0
Maintenance Expense [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (100,000) |  | 900,000 |  | 500,000
Maintenance Expense [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (100,000) |  | 600,000 |  | 300,000
Maintenance Expense [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (100,000) |  | 1,200,000 |  | 600,000
Maintenance Expense [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (100,000) |  | 800,000 |  | 400,000
Maintenance Expense [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | (200,000) |  | 1,100,000 |  | 500,000
Regulatory Assets [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | (94,800,000) |  | 52,600,000 |  | (9,100,000)
Regulatory Assets [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | (200,000) |  | 100,000 |  | 0
Regulatory Assets [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | (21,900,000) |  | (100,000) |  | (2,700,000)
Regulatory Assets [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | (3,100,000) |  | (800,000) |  | (14,800,000)
Regulatory Assets [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | (14,000,000.0) |  | 52,100,000 |  | 10,000,000.0
Regulatory Assets [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | (29,800,000) |  | 3,600,000 |  | (3,600,000)
Regulatory Assets [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | (15,500,000) |  | (2,100,000) |  | 3,600,000
Regulatory Liabilities [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | 169,700,000 |  | 299,700,000 |  | 156,400,000
Regulatory Liabilities [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | 0 |  | (600,000) |  | 200,000
Regulatory Liabilities [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | 1,000,000.0 |  | 82,400,000 |  | 55,900,000
Regulatory Liabilities [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | 7,800,000 |  | 8,600,000 |  | (3,900,000)
Regulatory Liabilities [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | 0 |  | 3,700,000 |  | 0
Regulatory Liabilities [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | 88,700,000 |  | 98,500,000 |  | 48,900,000
Regulatory Liabilities [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [7] | $ 70,700,000 |  | $ 77,900,000 |  | $ 37,000,000.0
[1] | Amounts include $(30) million and $(38) million as of December 31, 2023 and 2022, respectively, for the fair value hedge adjustment of hedged debt obligations for which hedge accounting has been discontinued.
[2] | Amounts included within Noncurrent Liabilities line item Long-term Debt on the Balance Sheet.
[3] | Gain (Loss) is included in Interest Expense on the statements of income.
[4] | The December 31, 2023 maturities of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), were as follows: Level 1 matures $(11) million in 2024 and $(4) million in 2025-2027; Level 2 matures $(99) million in 2024, $(44) million in periods 2025-2027, $7 million in periods 2028-2029 and $2 million in periods 2030-2033; Level 3 matures $74 million in 2024, $43 million in periods 2025-2027, $18 million in periods 2028-2029 and $(16) million in periods 2030-2033. Risk management commodity contracts are substantially comprised of power contracts.
[5] | Amounts in “Other” column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.”
[6] | The December 31, 2022 maturities of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), were as follows: Level 1 matures $(7) million in 2023; Level 2 matures $182 million in 2023, $134 million in periods 2024-2026; $10 million in periods 2027-2028 and $1 million in periods 2029-2033; Level 3 matures $128 million in 2023, $6 million in periods 2024-2026, $6 million in periods 2027-2028 and $(5) million in periods 2029-2033. Risk management commodity contracts are substantially comprised of power contracts.
[7] | Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.

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