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v3.23.1

Derivatives and Hedging (Details) gal in Millions, MWh in Millions, MMBTU in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) MWh MMBTU gal | Dec. 31, 2021 USD ($) MWh MMBTU gal | Dec. 31, 2020 USD ($)
Cash Collateral Netting |  |  |  |  |  |
Cash Collateral Received Netted Against Risk Management Assets |  | $ 481,000,000 |  | $ 263,000,000 |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 348,800,000 |  | 200,400,000 |  |
Derivative Asset, Noncurrent |  | 284,100,000 |  | 267,000,000.0 |  |
Total Assets |  | 632,900,000 |  | 467,400,000 |  |
Current Risk Management Liabilities |  | 145,200,000 |  | 75,500,000 |  |
Derivative Liability, Noncurrent |  | 345,200,000 |  | 230,300,000 |  |
Total Liabilities |  | 490,400,000 |  | 305,800,000 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 693,700,000 | [1] | 324,000,000.0 |  | $ 116,900,000
Impact of Fair Value Hedges on the Balance Sheet |  |  |  |  |  |
Carrying Amount of Hedged Asset (Liability) | [2],[3] | (855,500,000) |  | (952,300,000) |  |
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability) | [2],[3] | 89,700,000 |  | (8,500,000) |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
Gain (Loss) on Fair Value Hedging Instruments | [4] | (90,400,000) |  | (35,500,000) |  | 41,100,000
Gain (Loss) on Fair Value Portion of Long Term Debt | [4] | 90,400,000 |  | 35,500,000 |  | (41,100,000)
Collateral Triggering Events |  |  |  |  |  |
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements |  | 217,000,000 |  | 76,000,000 |  |
Derivatives and Hedging (Textuals) |  |  |  |  |  |
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) |  | (38,000,000) |  | (46,000,000) |  |
Notional Amount of a Discontinued Hedge |  | 500,000,000 |  |  |  |
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge |  | 57,000,000 |  |  |  |
Credit Downgrade Trigger Exposure |  | 2,000,000 |  | 9,000,000 |  |
Fair Value Of Derivative Liabilities Subject To Cross Acceleration Provisions |  | 127,000,000 |  | 40,000,000 |  |
AEP Texas Inc. [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 2,800,000 | [1] | 2,000,000.0 |  | (1,000,000.0)
Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 69,100,000 |  | 42,000,000.0 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 88,600,000 | [1] | 55,300,000 |  | 21,300,000
Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 15,200,000 |  | 3,300,000 |  |
Current Risk Management Liabilities |  | 0 |  | 5,000,000.0 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 19,600,000 | [1] | (18,200,000) |  | 12,000,000.0
Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Liabilities |  | 1,800,000 |  | 6,700,000 |  |
Derivative Liability, Noncurrent |  | 37,900,000 |  | 85,800,000 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 57,800,000 | [1] | 11,100,000 |  | 5,000,000.0
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 25,300,000 |  | 12,100,000 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 103,700,000 | [1] | 46,000,000.0 |  | 38,600,000
Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 16,400,000 |  | 9,800,000 |  |
Current Risk Management Liabilities |  | 1,400,000 |  | 2,100,000 |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 77,700,000 | [1] | 41,500,000 |  | 21,000,000.0
Risk Management Contracts [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets | [5] | 315,400,000 | [6] | 245,800,000 | [7] |
Total Liabilities | [5] | 339,800,000 | [6] | 254,800,000 | [7] |
Risk Management Contracts [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets |  |  |  | 0 |  |
Risk Management Contracts [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets | [5],[8] | 69,100,000 |  | 42,000,000.0 |  |
Total Liabilities | [5],[8] | 3,500,000 |  | 800,000 |  |
Risk Management Contracts [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets | [5],[8] | 15,400,000 |  | 3,300,000 |  |
Total Liabilities | [5],[8] | 0 |  | 5,000,000.0 |  |
Risk Management Contracts [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets | [5],[8] | 0 |  | 0 |  |
Total Liabilities | [5],[8] | 39,700,000 |  | 92,500,000 |  |
Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets |  | 25,300,000 |  | 12,100,000 | [5],[8] |
Total Liabilities | [5],[8] | 1,600,000 |  | 3,700,000 |  |
Risk Management Contracts [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Total Assets | [5],[8] | 16,400,000 |  | 10,900,000 |  |
Total Liabilities | [5],[8] | 1,400,000 |  | 2,100,000 |  |
Commodity [Member] |  |  |  |  |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 223,500,000 |  | 163,700,000 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | $ 119,900,000 |  | 106,700,000 |  |
Derivatives and Hedging (Textuals) |  |  |  |  |  |
Maximum Length of Time Hedged in Price Risk Cash Flow Hedge |  | 99 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] | Risk Management Contracts [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [9] | 965,400,000 |  | 520,900,000 |  |
Derivative Asset, Noncurrent | [9] | 565,600,000 |  | 370,500,000 |  |
Total Assets | [9] | 1,531,000,000 |  | 891,400,000 |  |
Current Risk Management Liabilities | [9] | 663,800,000 |  | 397,200,000 |  |
Derivative Liability, Noncurrent | [9] | 412,000,000.0 |  | 243,900,000 |  |
Total Liabilities | [9] | 1,075,800,000 |  | 641,100,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [9] | 455,200,000 | [10] | 250,300,000 |  |
Commodity [Member] | Risk Management Contracts [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [9] | 0 |  | 600,000 |  |
Derivative Asset, Noncurrent | [9] | 0 |  | 0 |  |
Total Assets | [9] | 0 |  | 600,000 |  |
Current Risk Management Liabilities | [9] | 0 |  | 0 |  |
Derivative Liability, Noncurrent | [9] | 0 |  | 0 |  |
Total Liabilities | [9] | 0 |  | 0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [9] | 0 |  | 600,000 |  |
Commodity [Member] | Risk Management Contracts [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [9] | 69,300,000 |  | 47,500,000 |  |
Derivative Asset, Noncurrent | [9] | 700,000 |  | 200,000 |  |
Total Assets | [9] | 70,000,000.0 |  | 47,700,000 |  |
Current Risk Management Liabilities | [9] | 4,100,000 |  | 7,200,000 |  |
Derivative Liability, Noncurrent | [9] | 700,000 |  | 200,000 |  |
Total Liabilities | [9] | 4,800,000 |  | 7,400,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [9] | 65,200,000 | [10] | 40,300,000 |  |
Commodity [Member] | Risk Management Contracts [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [9] | 16,000,000.0 |  | 11,100,000 |  |
Derivative Asset, Noncurrent | [9] | 500,000 |  | 200,000 |  |
Total Assets | [9] | 16,500,000 |  | 11,300,000 |  |
Current Risk Management Liabilities | [9] | 900,000 |  | 14,800,000 |  |
Derivative Liability, Noncurrent | [9] | 300,000 |  | 200,000 |  |
Total Liabilities | [9] | 1,200,000 |  | 15,000,000.0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [9] | 15,300,000 | [10] | (3,700,000) |  |
Commodity [Member] | Risk Management Contracts [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [9] | 0 |  | 500,000 |  |
Derivative Asset, Noncurrent | [9] | 0 |  | 0 |  |
Total Assets | [9] | 0 |  | 500,000 |  |
Current Risk Management Liabilities | [9] | 2,100,000 |  | 6,700,000 |  |
Derivative Liability, Noncurrent | [9] | 37,900,000 |  | 85,800,000 |  |
Total Liabilities | [9] | 40,000,000.0 |  | 92,500,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [9] | (40,000,000.0) | [10] | (92,000,000.0) |  |
Commodity [Member] | Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [9] | 24,100,000 |  | 12,400,000 |  |
Derivative Asset, Noncurrent | [9] | 0 |  | 0 |  |
Total Assets | [9] | 24,100,000 |  | 12,400,000 |  |
Current Risk Management Liabilities | [9] | 2,100,000 |  | 3,700,000 |  |
Derivative Liability, Noncurrent | [9] | 0 |  | 0 |  |
Total Liabilities | [9] | 2,100,000 |  | 3,700,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [9] | 22,000,000.0 | [10] | 8,700,000 |  |
Commodity [Member] | Risk Management Contracts [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [9] | 16,800,000 |  | 10,100,000 |  |
Derivative Asset, Noncurrent | [9] | 0 |  | 1,100,000 |  |
Total Assets | [9] | 16,800,000 |  | 11,200,000 |  |
Current Risk Management Liabilities | [9] | 2,000,000.0 |  | 2,100,000 |  |
Derivative Liability, Noncurrent | [9] | 0 |  | 0 |  |
Total Liabilities | [9] | 2,000,000.0 |  | 2,100,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [9] | 14,800,000 | [10] | 9,100,000 |  |
Commodity [Member] | Hedging Contracts [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [9] | 212,200,000 |  | 176,000,000.0 |  |
Derivative Asset, Noncurrent | [9] | 148,900,000 |  | 89,100,000 |  |
Total Assets | [9] | 361,100,000 |  | 265,100,000 |  |
Current Risk Management Liabilities | [9] | 60,400,000 |  | 40,900,000 |  |
Derivative Liability, Noncurrent | [9] | 17,400,000 |  | 16,700,000 |  |
Total Liabilities | [9] | 77,800,000 |  | 57,600,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [9] | 283,300,000 | [10] | 207,500,000 |  |
Interest Rate [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | 1,650,000,000 |  | 950,000,000.0 |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 300,000 |  | (21,300,000) |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | $ 300,000 |  | (3,300,000) |  |
Derivatives and Hedging (Textuals) |  |  |  |  |  |
Maximum Length of Time Hedged in Price Risk Cash Flow Hedge |  | 96 months |  |  |  |
Interest Rate [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | $ 0 |  | 0 |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | (300,000) |  | (1,300,000) |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | (200,000) |  | (1,100,000) |  |
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 |  | 6,700,000 |  | 7,500,000 |  |
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 |  | (5,100,000) |  | (6,700,000) |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | (600,000) |  | (1,600,000) |  |
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 |  | 200,000,000.0 |  | 0 |  |
Impact of Cash Flow Hedges on the Balance Sheet |  |  |  |  |  |
AOCI Gain (Loss) Net of Tax |  | 1,300,000 |  | 0 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 100,000 |  | 0 |  |
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 |  | 1,100,000 |  | 1,200,000 |  |
Portion Expected to be Reclassified to Net Income During the Next Twelve Months |  | 200,000 |  | 100,000 |  |
Interest Rate [Member] | Hedging Contracts [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [9] | 1,800,000 |  | 1,200,000 |  |
Derivative Asset, Noncurrent | [9] | 14,300,000 |  | 0 |  |
Total Assets | [9] | 16,100,000 |  | 1,200,000 |  |
Current Risk Management Liabilities | [9] | 41,400,000 |  | 0 |  |
Derivative Liability, Noncurrent | [9] | 91,100,000 |  | 38,100,000 |  |
Total Liabilities | [9] | 132,500,000 |  | 38,100,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [9] | (116,400,000) |  | (36,900,000) |  |
Interest Rate [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [9] | 1,600,000 |  |  |  |
Derivative Asset, Noncurrent | [9] | 0 |  |  |  |
Total Assets | [9] | 1,600,000 |  |  |  |
Current Risk Management Liabilities | [9] | 0 |  |  |  |
Derivative Liability, Noncurrent | [9] | 0 |  |  |  |
Total Liabilities | [9] | 0 |  |  |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [9] | 1,600,000 |  |  |  |
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 1,179,400,000 |  | 698,100,000 |  |
Derivative Asset, Noncurrent |  | 728,800,000 |  | 459,600,000 |  |
Total Assets |  | 1,908,200,000 |  | 1,157,700,000 |  |
Current Risk Management Liabilities |  | 765,600,000 |  | 438,100,000 |  |
Derivative Liability, Noncurrent |  | 520,500,000 |  | 298,700,000 |  |
Total Liabilities |  | 1,286,100,000 |  | 736,800,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | 622,100,000 | [10] | 420,900,000 |  |
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets |  | 25,700,000 |  |  |  |
Derivative Asset, Noncurrent |  | 0 |  |  |  |
Total Assets |  | 25,700,000 |  |  |  |
Current Risk Management Liabilities |  | 2,100,000 |  |  |  |
Derivative Liability, Noncurrent |  | 0 |  |  |  |
Total Liabilities |  | 2,100,000 |  |  |  |
Total MTM Derivative Contract Net Assets (Liabilities) |  | 23,600,000 |  |  |  |
Gross Amounts Offset in the Statement of Financial Position [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [11] | (830,600,000) |  | (497,700,000) |  |
Derivative Asset, Noncurrent | [11] | (444,700,000) |  | (192,600,000) |  |
Total Assets | [11] | (1,275,300,000) |  | (690,300,000) |  |
Current Risk Management Liabilities | [11] | (620,400,000) |  | (362,600,000) |  |
Derivative Liability, Noncurrent | [11] | (175,300,000) |  | (68,400,000) |  |
Total Liabilities | [11] | (795,700,000) |  | (431,000,000.0) |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [11] | (479,600,000) | [10] | (259,300,000) |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [11] | 0 |  | (600,000) |  |
Derivative Asset, Noncurrent | [11] | 0 |  | 0 |  |
Total Assets | [11] | 0 |  | (600,000) |  |
Current Risk Management Liabilities | [11] | 0 |  | 0 |  |
Derivative Liability, Noncurrent | [11] | 0 |  | 0 |  |
Total Liabilities | [11] | 0 |  | 0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [11] | 0 |  | (600,000) |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [11] | (200,000) |  | (5,500,000) |  |
Derivative Asset, Noncurrent | [11] | (700,000) |  | (200,000) |  |
Total Assets | [11] | (900,000) |  | (5,700,000) |  |
Current Risk Management Liabilities | [11] | (500,000) |  | (6,400,000) |  |
Derivative Liability, Noncurrent | [11] | (600,000) |  | (200,000) |  |
Total Liabilities | [11] | (1,100,000) |  | (6,600,000) |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [11] | 200,000 |  | 900,000 |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [11] | (800,000) |  | (7,800,000) |  |
Derivative Asset, Noncurrent | [11] | (300,000) |  | (200,000) |  |
Total Assets | [11] | (1,100,000) |  | (8,000,000.0) |  |
Current Risk Management Liabilities | [11] | (900,000) |  | (9,800,000) |  |
Derivative Liability, Noncurrent | [11] | (300,000) |  | (200,000) |  |
Total Liabilities | [11] | (1,200,000) |  | (10,000,000.0) |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [11] | 100,000 |  | 2,000,000.0 |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [11] | 0 |  | (500,000) |  |
Derivative Asset, Noncurrent | [11] | 0 |  | 0 |  |
Total Assets | [11] | 0 |  | (500,000) |  |
Current Risk Management Liabilities | [11] | (300,000) |  | 0 |  |
Derivative Liability, Noncurrent | [11] | 0 |  | 0 |  |
Total Liabilities | [11] | (300,000) |  | 0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [11] | 300,000 | [10] | (500,000) |  |
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 | [11] | (400,000) |  | (300,000) |  |
Derivative Asset, Noncurrent | [11] | 0 |  | 0 |  |
Total Assets | [11] | (400,000) |  | (300,000) |  |
Current Risk Management Liabilities | [11] | (500,000) |  | 0 |  |
Derivative Liability, Noncurrent | [11] | 0 |  | 0 |  |
Total Liabilities | [11] | (500,000) |  | 0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [11] | 100,000 |  | (300,000) |  |
Gross Amounts Offset in the Statement of Financial Position [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [11] | (400,000) |  | (300,000) |  |
Derivative Asset, Noncurrent | [11] | 0 |  | 0 |  |
Total Assets | [11] | (400,000) |  | (300,000) |  |
Current Risk Management Liabilities | [11] | (600,000) |  | 0 |  |
Derivative Liability, Noncurrent | [11] | 0 |  | 0 |  |
Total Liabilities | [11] | (600,000) |  | 0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [11] | 200,000 | [10] | (300,000) |  |
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] |  |  |  |  |  |
Fair Value of Derivative Instruments |  |  |  |  |  |
Current Risk Management Assets | [12] | 348,800,000 |  | 200,400,000 |  |
Derivative Asset, Noncurrent | [12] | 284,100,000 |  | 267,000,000.0 |  |
Total Assets | [12] | 632,900,000 |  | 467,400,000 |  |
Current Risk Management Liabilities | [12] | 145,200,000 |  | 75,500,000 |  |
Derivative Liability, Noncurrent | [12] | 345,200,000 |  | 230,300,000 |  |
Total Liabilities | [12] | 490,400,000 |  | 305,800,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [12] | 142,500,000 |  | 161,600,000 |  |
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 | [12] | 0 |  | 0 |  |
Derivative Asset, Noncurrent | [12] | 0 |  | 0 |  |
Total Assets | [12] | 0 |  | 0 |  |
Current Risk Management Liabilities | [12] | 0 |  | 0 |  |
Derivative Liability, Noncurrent | [12] | 0 |  | 0 |  |
Total Liabilities | [12] | 0 |  | 0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [12] | 0 |  | 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 | [12] | 69,100,000 |  | 42,000,000.0 |  |
Derivative Asset, Noncurrent | [12] | 0 |  | 0 |  |
Total Assets | [12] | 69,100,000 |  | 42,000,000.0 |  |
Current Risk Management Liabilities | [12] | 3,600,000 |  | 800,000 |  |
Derivative Liability, Noncurrent | [12] | 100,000 |  | 0 |  |
Total Liabilities | [12] | 3,700,000 |  | 800,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [12] | 65,400,000 | [10] | 41,200,000 |  |
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 | [12] | 15,200,000 |  | 3,300,000 |  |
Derivative Asset, Noncurrent | [12] | 200,000 |  | 0 |  |
Total Assets | [12] | 15,400,000 |  | 3,300,000 |  |
Current Risk Management Liabilities | [12] | 0 |  | 5,000,000.0 |  |
Derivative Liability, Noncurrent | [12] | 0 |  | 0 |  |
Total Liabilities | [12] | 0 |  | 5,000,000.0 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [12] | 15,400,000 | [10] | (1,700,000) |  |
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 | [12] | 0 |  | 0 |  |
Derivative Asset, Noncurrent | [12] | 0 |  | 0 |  |
Total Assets | [12] | 0 |  | 0 |  |
Current Risk Management Liabilities | [12] | 1,800,000 |  | 6,700,000 |  |
Derivative Liability, Noncurrent | [12] | 37,900,000 |  | 85,800,000 |  |
Total Liabilities | [12] | 39,700,000 |  | 92,500,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [12] | (39,700,000) | [10] | (92,500,000) |  |
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 | [12] | 25,300,000 |  | 12,100,000 |  |
Derivative Asset, Noncurrent | [12] | 0 |  | 0 |  |
Total Assets | [12] | 25,300,000 |  | 12,100,000 |  |
Current Risk Management Liabilities | [12] | 1,600,000 |  | 3,700,000 |  |
Derivative Liability, Noncurrent | [12] | 0 |  | 0 |  |
Total Liabilities | [12] | 1,600,000 |  | 3,700,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [12] | 23,700,000 | [10] | 8,400,000 |  |
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 | [12] | 16,400,000 |  | 9,800,000 |  |
Derivative Asset, Noncurrent | [12] | 0 |  | 1,100,000 |  |
Total Assets | [12] | 16,400,000 |  | 10,900,000 |  |
Current Risk Management Liabilities | [12] | 1,400,000 |  | 2,100,000 |  |
Derivative Liability, Noncurrent | [12] | 0 |  | 0 |  |
Total Liabilities | [12] | 1,400,000 |  | 2,100,000 |  |
Total MTM Derivative Contract Net Assets (Liabilities) | [12] | $ 15,000,000.0 | [10] | $ 8,800,000 |  |
Power [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 226.8 |  | 287.9 |  |
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 |  | 17.9 |  | 33.1 |  |
Power [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 4.2 |  | 13.6 |  |
Power [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 2.5 |  | 2.7 |  |
Power [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 2.9 |  | 11.9 |  |
Power [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MWh |  | 2.2 |  | 3.4 |  |
Natural Gas [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MMBTU |  | 77.1 |  | 34.1 |  |
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 |  | 1.9 |  | 0.0 |  |
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 |  | 1.9 |  | 1.3 |  |
Natural Gas [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Energy Notional Amount | MMBTU |  | 2.1 |  | 5.1 |  |
Heating Oil and Gasoline [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 6.9 |  | 7.4 |  |
Heating Oil and Gasoline [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 1.9 |  | 1.9 |  |
Heating Oil and Gasoline [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 1.0 |  | 1.1 |  |
Heating Oil and Gasoline [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 0.7 |  | 0.7 |  |
Heating Oil and Gasoline [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 1.4 |  | 1.5 |  |
Heating Oil and Gasoline [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 0.9 |  | 0.8 |  |
Heating Oil and Gasoline [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Volume Notional Amount | gal |  | 1.0 |  | 1.0 |  |
Interest Rate Contract [Member] |  |  |  |  |  |
Commodity |  |  |  |  |  |
Derivative, Notional Amount |  | $ 99,900,000 |  | $ 116,500,000 |  |
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 |  | 11,100,000 |  | (600,000) |  | 800,000
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 |  | 313,800,000 |  | 169,100,000 |  | 9,500,000
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 |  | 500,000 |  | (500,000) |  | 400,000
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 |  | 10,600,000 |  | (100,000) |  | 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 |  | 100,000
Purchased Electricity for Resale [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 5,000,000.0 |  | 2,000,000.0 |  | 1,400,000
Purchased Electricity for Resale [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 for Resale [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 4,500,000 |  | 1,800,000 |  | 1,200,000
Purchased Electricity for Resale [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 |  | 0 |  | 100,000
Purchased Electricity for Resale [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 for Resale [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 |  | 200,000 |  | 0 |  | 0
Purchased Electricity for Resale [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 |  | 4,800,000 |  | 2,800,000 |  | (2,000,000.0)
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 |  | 1,500,000 |  | 800,000 |  | (600,000)
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 |  | 400,000 |  | 300,000 |  | (200,000)
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 |  | 500,000 |  | 300,000 |  | (200,000)
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 |  | 800,000 |  | 500,000 |  | (300,000)
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 |  | 600,000 |  | 300,000 |  | (200,000)
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 |  | 800,000 |  | 400,000 |  | (300,000)
Maintenance Expense [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  | 6,700,000 |  | 3,400,000 |  | (2,900,000)
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 |  | 1,800,000 |  | 1,000,000.0 |  | (800,000)
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 |  | 900,000 |  | 500,000 |  | (400,000)
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 |  | 600,000 |  | 300,000 |  | (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 |  | 1,200,000 |  | 600,000 |  | (500,000)
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 |  | 800,000 |  | 400,000 |  | (300,000)
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 |  | 1,100,000 |  | 500,000 |  | (400,000)
Regulatory Assets [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [13] | 52,600,000 |  | (9,100,000) |  | (4,800,000)
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 | [13] | 100,000 |  | 0 |  | 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 | [13] | (100,000) |  | (2,700,000) |  | 0
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 | [13] | (800,000) |  | (14,800,000) |  | (100,000)
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 | [13] | 52,100,000 |  | 10,000,000.0 |  | (6,600,000)
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 | [13] | 3,600,000 |  | (3,600,000) |  | 0
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 | [13] | (2,100,000) |  | 3,600,000 |  | 1,400,000
Regulatory Liabilities [Member] |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts |  |  |  |  |  |
Amount of Gain (Loss) Recognized on Risk Management Contracts | [13] | 299,700,000 |  | 156,400,000 |  | 114,900,000
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 | [13] | (600,000) |  | 200,000 |  | 400,000
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 | [13] | 82,400,000 |  | 55,900,000 |  | 20,300,000
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 | [13] | 8,600,000 |  | (3,900,000) |  | 12,400,000
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 | [13] | 3,700,000 |  | 0 |  | 12,400,000
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 | [13] | 98,500,000 |  | 48,900,000 |  | 39,100,000
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 | [13] | $ 77,900,000 |  | $ 37,000,000.0 |  | $ 20,200,000
[1] | Increase in amounts for the year ended December 31, 2022 are primarily due to increases in commodity prices for power and natural gas and an increase in value of FTRs.
[2] | Amounts include $(38) million and $(46) million as of December 31, 2022 and 2021, respectively, for the fair value hedge adjustment of hedged debt obligations for which hedge accounting has been discontinued.
[3] | Amounts included on the Balance Sheet within Current and Noncurrent Liabilities line items Long-term Debt Due within One Year and Long-term Debt, respectively.
[4] | Gain (Loss) is included in Interest Expense on the statements of income.
[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] | The December 31, 2021 maturities of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), were as follows: Level 1 matures $1 million in 2022 and $1 million in periods 2023-2025; Level 2 matures $42 million in 2022, $109 million in periods 2023-2025; $10 million in periods 2026-2027 and $3 million in periods 2028-2033; Level 3 matures $82 million in 2022, $10 million in periods 2023-2025, $9 million in periods 2026-2027 and $(17) million in periods 2028-2033. Risk management commodity contracts are substantially comprised of power contracts.
[8] | Substantially comprised of power contracts for the Registrant Subsidiaries.
[9] | Derivative instruments within these categories are disclosed as gross. These instruments are subject to master netting agreements and are presented on the balance sheets on a net basis in accordance with the accounting guidance for “Derivatives and Hedging.”
[10] | Increase in amounts as of December 31, 2022 are primarily due to increases in commodity prices for power and natural gas and an increase in value of FTRs.
[11] | Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for “Derivatives and Hedging.”
[12] | All derivative contracts subject to a master netting arrangement or similar agreement are offset in the statement of financial position.
[13] | 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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