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PROPERTY, PLANT, AND EQUIPMENT - Depreciation Rates and Useful Lives (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Unregulated Operation | INDIANA MICHIGAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 39 years |  |
Minimum | Regulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 20 years | 20 years | 20 years
Transmission | 15 years | 15 years | 24 years
Distribution | 7 years | 7 years | 7 years
Other | 5 years | 5 years | 5 years
Minimum | Regulated Operation | AEP TEXAS INC. |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Transmission | 50 years | 50 years | 50 years
Distribution | 15 years | 7 years | 7 years
Other | 5 years | 5 years | 5 years
Minimum | Regulated Operation | AEP TRANSMISSION COMPANY, LLC |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Transmission | 24 years | 24 years | 24 years
Other | 5 years | 5 years | 5 years
Minimum | Regulated Operation | APPALACHIAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 35 years | 35 years | 35 years
Transmission | 15 years | 15 years | 24 years
Distribution | 12 years | 12 years | 12 years
Other | 5 years | 5 years | 5 years
Minimum | Regulated Operation | INDIANA MICHIGAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 20 years | 20 years | 20 years
Transmission | 44 years | 44 years | 44 years
Distribution | 15 years | 14 years | 14 years
Other | 5 years | 5 years | 5 years
Minimum | Regulated Operation | OHIO POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Transmission | 39 years | 39 years | 39 years
Distribution | 11 years | 11 years | 11 years
Other | 5 years | 5 years | 5 years
Minimum | Regulated Operation | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 30 years | 25 years | 30 years
Transmission | 41 years | 41 years | 42 years
Distribution | 15 years | 15 years | 15 years
Other | 5 years | 5 years | 5 years
Minimum | Regulated Operation | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 30 years | 30 years | 30 years
Transmission | 46 years | 46 years | 44 years
Distribution | 7 years | 7 years | 15 years
Other | 5 years | 5 years | 5 years
Minimum | Unregulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 39 years | 10 years | 3 years
Transmission |  | 62 years | 10 years
Other | 5 years | 5 years | 5 years
Maximum | Regulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 162 years | 162 years | 132 years
Transmission | 79 years | 78 years | 75 years
Distribution | 85 years | 85 years | 78 years
Other | 75 years | 75 years | 75 years
Maximum | Regulated Operation | AEP TEXAS INC. |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Transmission | 79 years | 75 years | 75 years
Distribution | 74 years | 70 years | 70 years
Other | 54 years | 50 years | 50 years
Maximum | Regulated Operation | AEP TRANSMISSION COMPANY, LLC |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Transmission | 78 years | 78 years | 75 years
Other | 58 years | 58 years | 56 years
Maximum | Regulated Operation | APPALACHIAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 162 years | 162 years | 118 years
Transmission | 78 years | 78 years | 75 years
Distribution | 60 years | 60 years | 57 years
Other | 55 years | 55 years | 55 years
Maximum | Regulated Operation | INDIANA MICHIGAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 132 years | 132 years | 132 years
Transmission | 67 years | 67 years | 67 years
Distribution | 76 years | 71 years | 71 years
Other | 45 years | 45 years | 45 years
Maximum | Regulated Operation | OHIO POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Transmission | 60 years | 60 years | 60 years
Distribution | 70 years | 70 years | 70 years
Other | 50 years | 50 years | 50 years
Maximum | Regulated Operation | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 78 years | 75 years | 75 years
Transmission | 75 years | 75 years | 75 years
Distribution | 85 years | 85 years | 78 years
Other | 58 years | 58 years | 56 years
Maximum | Regulated Operation | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 65 years | 65 years | 65 years
Transmission | 70 years | 70 years | 70 years
Distribution | 75 years | 75 years | 75 years
Other | 58 years | 58 years | 57 years
Maximum | Unregulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Generation | 61 years | 61 years | 61 years
Transmission |  |  | 62 years
Other | 35 years | 35 years | 35 years
Generation | Regulated Operation | APPALACHIAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 3.20% | 3.30% | 3.60%
Generation | Regulated Operation | INDIANA MICHIGAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 4.90% | 4.70% | 4.90%
Generation | Regulated Operation | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 3.30% | 3.00% | 3.10%
Generation | Regulated Operation | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 3.70% | 2.90% | 2.70%
Generation | Unregulated Operation | INDIANA MICHIGAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 1.80% |  |
Generation | Minimum | Regulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.70% | 2.70% | 2.70%
Generation | Minimum | Unregulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 1.80% | 4.80% | 3.80%
Generation | Maximum | Regulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 4.90% | 4.70% | 7.60%
Generation | Maximum | Unregulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 6.00% | 6.70% | 8.70%
Transmission | Regulated Operation | AEP TEXAS INC. |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.20% | 2.20% | 2.20%
Transmission | Regulated Operation | AEP TRANSMISSION COMPANY, LLC |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.70% | 2.60% | 2.60%
Transmission | Regulated Operation | APPALACHIAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.30% | 2.30% | 2.20%
Transmission | Regulated Operation | INDIANA MICHIGAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.60% | 2.50% | 2.50%
Transmission | Regulated Operation | OHIO POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.30% | 2.30% | 2.30%
Transmission | Regulated Operation | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.60% | 2.60% | 2.50%
Transmission | Regulated Operation | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.20% | 2.20% | 2.30%
Transmission | Unregulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges |  | 2.50% | 2.80%
Transmission | Minimum | Regulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.10% | 2.00% | 2.00%
Transmission | Maximum | Regulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.70% | 2.70% | 2.70%
Distribution | Regulated Operation | AEP TEXAS INC. |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.80% | 2.90% | 2.90%
Distribution | Regulated Operation | APPALACHIAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 3.50% | 3.60% | 3.60%
Distribution | Regulated Operation | INDIANA MICHIGAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.80% | 2.90% | 3.10%
Distribution | Regulated Operation | OHIO POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 3.10% | 3.10% | 2.70%
Distribution | Regulated Operation | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.80% | 2.90% | 2.90%
Distribution | Regulated Operation | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.90% | 2.90% | 2.90%
Distribution | Minimum | Regulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 2.80% | 2.90% | 2.70%
Distribution | Maximum | Regulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 3.50% | 3.60% | 3.60%
Other | Regulated Operation | AEP TEXAS INC. |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 5.90% | 6.00% | 6.20%
Other | Regulated Operation | AEP TRANSMISSION COMPANY, LLC |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 7.10% | 7.00% | 6.60%
Other | Regulated Operation | APPALACHIAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 6.80% | 7.40% | 7.30%
Other | Regulated Operation | INDIANA MICHIGAN POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 8.90% | 9.10% | 10.10%
Other | Regulated Operation | OHIO POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 5.90% | 6.40% | 6.10%
Other | Regulated Operation | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 6.60% | 6.80% | 6.80%
Other | Regulated Operation | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 6.70% | 8.50% | 9.00%
Other | Unregulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 9.70% | 10.60% | 25.20%
Other | Minimum | Regulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 3.00% | 3.80% | 3.10%
Other | Maximum | Regulated Operation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual Composite Depreciation Rate Ranges | 8.90% | 9.10% | 14.40%

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