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FAIR VALUE MEASUREMENTS - Significant Unobservable Inputs (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | $ 499,500,000 | $ 538,700,000
Fair value, liabilities | 324,400,000 | 471,400,000
APPALACHIAN POWER COMPANY |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 37,100,000 | 22,400,000
Fair value, liabilities | 2,200,000 | 22,500,000
INDIANA MICHIGAN POWER COMPANY |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 18,400,000 | 39,600,000
Fair value, liabilities | 700,000 | 2,000,000.0
OHIO POWER COMPANY |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 0 | 0
Fair value, liabilities | 47,500,000 | 50,700,000
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 22,000,000.0 | 19,000,000.0
Fair value, liabilities | 5,800,000 | 29,900,000
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 18,100,000 | 11,600,000
Fair value, liabilities | 2,300,000 | 15,600,000
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 313,500,000 | 294,100,000
Fair value, liabilities | 147,900,000 | 154,700,000
Energy Contracts | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 221,200,000 | 225,500,000
Fair value, liabilities | 144,600,000 | 144,900,000
Energy Contracts | Level 3 | OHIO POWER COMPANY |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 0 | 0
Fair value, liabilities | $ 47,500,000 | $ 50,600,000
Energy Contracts | Level 3 | Low | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 2.75 | 5.21
Input/Range | 2.75 | 5.21
Energy Contracts | Level 3 | Low | OHIO POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 14.53 | 22.92
Input/Range | 14.53 | 22.92
Energy Contracts | Level 3 | High | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 149.30 | 153.77
Input/Range | 149.30 | 153.77
Energy Contracts | Level 3 | High | OHIO POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 72.40 | 67.53
Input/Range | 72.40 | 67.53
Energy Contracts | Level 3 | Weighted Average | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 49.34 | 45.05
Input/Range | 49.34 | 45.05
Energy Contracts | Level 3 | Weighted Average | OHIO POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 42.44 | 42.85
Input/Range | 42.44 | 42.85
FTRs | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | $ 92,300,000 | $ 68,600,000
Fair value, liabilities | 3,300,000 | 9,300,000
FTRs | Level 3 | APPALACHIAN POWER COMPANY |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 35,200,000 | 23,500,000
Fair value, liabilities | 0 | 1,100,000
FTRs | Level 3 | INDIANA MICHIGAN POWER COMPANY |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 6,900,000 | 4,500,000
Fair value, liabilities | 500,000 | 1,700,000
FTRs | Level 3 | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 20,800,000 | 19,700,000
Fair value, liabilities | 800,000 | 1,100,000
FTRs | Level 3 | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets | 18,100,000 | 12,000,000.0
Fair value, liabilities | $ 600,000 | $ 400,000
FTRs | Level 3 | Low | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | (29.48) | (25.45)
Input/Range | (29.48) | (25.45)
FTRs | Level 3 | Low | APPALACHIAN POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | (0.25) | (1.04)
Input/Range | (0.25) | (1.04)
FTRs | Level 3 | Low | INDIANA MICHIGAN POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | (4.07) | (1.48)
Input/Range | (4.07) | (1.48)
FTRs | Level 3 | Low | PUBLIC SERVICE COMPANY OF OKLAHOMA | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | (29.48) | (25.45)
Input/Range | (29.48) | (25.45)
FTRs | Level 3 | Low | SOUTHWESTERN ELECTRIC POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | (29.48) | (25.45)
Input/Range | (29.48) | (25.45)
FTRs | Level 3 | High | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 19.70 | 17.07
Input/Range | 19.70 | 17.07
FTRs | Level 3 | High | APPALACHIAN POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 9.32 | 6.45
Input/Range | 9.32 | 6.45
FTRs | Level 3 | High | INDIANA MICHIGAN POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 9.32 | 8.40
Input/Range | 9.32 | 8.40
FTRs | Level 3 | High | PUBLIC SERVICE COMPANY OF OKLAHOMA | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 10.54 | 4.80
Input/Range | 10.54 | 4.80
FTRs | Level 3 | High | SOUTHWESTERN ELECTRIC POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 10.54 | 4.80
Input/Range | 10.54 | 4.80
FTRs | Level 3 | Weighted Average | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 0.24 | 0
Input/Range | 0.24 | 0
FTRs | Level 3 | Weighted Average | APPALACHIAN POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 1.56 | 1.36
Input/Range | 1.56 | 1.36
FTRs | Level 3 | Weighted Average | INDIANA MICHIGAN POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | 1.34 | 0.85
Input/Range | 1.34 | 0.85
FTRs | Level 3 | Weighted Average | PUBLIC SERVICE COMPANY OF OKLAHOMA | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | (3.88) | (4.33)
Input/Range | (3.88) | (4.33)
FTRs | Level 3 | Weighted Average | SOUTHWESTERN ELECTRIC POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range | (3.88) | (4.33)
Input/Range | (3.88) | (4.33)
Natural Gas (MMBtus) | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets |  | $ 0
Fair value, liabilities |  | 500,000
Natural Gas (MMBtus) | Level 3 | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, assets |  | 0
Fair value, liabilities |  | $ 500,000
Natural Gas (MMBtus) | Level 3 | Low | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range |  | 3.11
Input/Range |  | 3.11
Natural Gas (MMBtus) | Level 3 | Low | SOUTHWESTERN ELECTRIC POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range |  | 3.11
Input/Range |  | 3.11
Natural Gas (MMBtus) | Level 3 | High | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range |  | 3.11
Input/Range |  | 3.11
Natural Gas (MMBtus) | Level 3 | High | SOUTHWESTERN ELECTRIC POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range |  | 3.11
Input/Range |  | 3.11
Natural Gas (MMBtus) | Level 3 | Weighted Average | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range |  | 3.11
Input/Range |  | 3.11
Natural Gas (MMBtus) | Level 3 | Weighted Average | SOUTHWESTERN ELECTRIC POWER COMPANY | Forward Market Price |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Input/Range |  | 3.11
Input/Range |  | 3.11

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