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LEASES - Balance Sheet Information (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Lessee, Lease, Description [Line Items] |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities, Other Liabilities, Noncurrent | Other Current Liabilities, Other Liabilities, Noncurrent
Net Property, Plant and Equipment Under Finance Leases | $ 163.6 | $ 204.5
Obligations Under Finance Leases: |  |
Noncurrent Liability | 117.1 | 139.9
Liability Due Within One Year | 46.5 | 65.7
Total Obligations Under Finance Leases | 163.6 | 205.6
Operating Lease Assets | 580.1 | 620.2
Obligations Under Operating Leases: |  |
Obligations Under Operating Leases | 504.3 | 519.4
Obligations Under Operating Leases | 91.9 | 115.7
Total Obligations Under Operating Leases | $ 596.2 | $ 635.1
AEP TEXAS INC. |  |
Lessee, Lease, Description [Line Items] |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities, Other Liabilities, Noncurrent | Other Current Liabilities, Other Liabilities, Noncurrent
Net Property, Plant and Equipment Under Finance Leases | $ 24.7 | $ 27.6
Obligations Under Finance Leases: |  |
Noncurrent Liability | 18.2 | 20.6
Liability Due Within One Year | 6.5 | 7.0
Total Obligations Under Finance Leases | 24.7 | 27.6
Operating Lease Assets | 54.4 | 77.6
Obligations Under Operating Leases: |  |
Obligations Under Operating Leases | 43.4 | 50.9
Obligations Under Operating Leases | 13.1 | 28.7
Total Obligations Under Operating Leases | $ 56.5 | $ 79.6
AEP TRANSMISSION COMPANY, LLC |  |
Lessee, Lease, Description [Line Items] |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities, Other Liabilities, Noncurrent | Other Current Liabilities, Other Liabilities, Noncurrent
Net Property, Plant and Equipment Under Finance Leases | $ 0.0 | $ 0.0
Obligations Under Finance Leases: |  |
Noncurrent Liability | 0.0 | 0.0
Liability Due Within One Year | 0.0 | 0.0
Total Obligations Under Finance Leases | 0.0 | 0.0
Operating Lease Assets | 2.3 | 2.6
Obligations Under Operating Leases: |  |
Obligations Under Operating Leases | 1.2 | 1.4
Obligations Under Operating Leases | 1.3 | 1.3
Total Obligations Under Operating Leases | $ 2.5 | $ 2.7
APPALACHIAN POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities, Other Liabilities, Noncurrent | Other Current Liabilities, Other Liabilities, Noncurrent
Net Property, Plant and Equipment Under Finance Leases | $ 19.0 | $ 26.0
Obligations Under Finance Leases: |  |
Noncurrent Liability | 11.2 | 17.8
Liability Due Within One Year | 7.8 | 8.2
Total Obligations Under Finance Leases | 19.0 | 26.0
Operating Lease Assets | 67.0 | 73.7
Obligations Under Operating Leases: |  |
Obligations Under Operating Leases | 54.0 | 59.8
Obligations Under Operating Leases | 13.7 | 14.6
Total Obligations Under Operating Leases | $ 67.7 | $ 74.4
INDIANA MICHIGAN POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities, Other Liabilities, Noncurrent | Other Current Liabilities, Other Liabilities, Noncurrent
Net Property, Plant and Equipment Under Finance Leases | $ 22.0 | $ 31.5
Obligations Under Finance Leases: |  |
Noncurrent Liability | 15.9 | 20.8
Liability Due Within One Year | 6.1 | 10.7
Total Obligations Under Finance Leases | 22.0 | 31.5
Operating Lease Assets | 51.5 | 53.8
Obligations Under Operating Leases: |  |
Obligations Under Operating Leases | 40.1 | 37.7
Obligations Under Operating Leases | 12.3 | 16.8
Total Obligations Under Operating Leases | $ 52.4 | $ 54.5
OHIO POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities, Other Liabilities, Noncurrent | Other Current Liabilities, Other Liabilities, Noncurrent
Net Property, Plant and Equipment Under Finance Leases | $ 14.3 | $ 18.2
Obligations Under Finance Leases: |  |
Noncurrent Liability | 10.2 | 13.2
Liability Due Within One Year | 4.1 | 5.0
Total Obligations Under Finance Leases | 14.3 | 18.2
Operating Lease Assets | 60.4 | 69.9
Obligations Under Operating Leases: |  |
Obligations Under Operating Leases | 48.4 | 56.7
Obligations Under Operating Leases | 12.3 | 13.5
Total Obligations Under Operating Leases | $ 60.7 | $ 70.2
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Lessee, Lease, Description [Line Items] |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities, Other Liabilities, Noncurrent | Other Current Liabilities, Other Liabilities, Noncurrent
Net Property, Plant and Equipment Under Finance Leases | $ 12.3 | $ 13.8
Obligations Under Finance Leases: |  |
Noncurrent Liability | 9.5 | 10.7
Liability Due Within One Year | 2.8 | 3.1
Total Obligations Under Finance Leases | 12.3 | 13.8
Operating Lease Assets | 106.2 | 112.8
Obligations Under Operating Leases: |  |
Obligations Under Operating Leases | 101.9 | 106.8
Obligations Under Operating Leases | 10.4 | 10.1
Total Obligations Under Operating Leases | $ 112.3 | $ 116.9
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities, Other Liabilities, Noncurrent | Other Current Liabilities, Other Liabilities, Noncurrent
Net Property, Plant and Equipment Under Finance Leases | $ 18.5 | $ 29.0
Obligations Under Finance Leases: |  |
Noncurrent Liability | 14.8 | 18.8
Liability Due Within One Year | 3.7 | 11.3
Total Obligations Under Finance Leases | 18.5 | 30.1
Operating Lease Assets | 141.0 | 126.3
Obligations Under Operating Leases: |  |
Obligations Under Operating Leases | 137.5 | 122.5
Obligations Under Operating Leases | 8.2 | 9.0
Total Obligations Under Operating Leases | 145.7 | 131.5
Generation |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 73.8 | 120.1
Generation | AEP TEXAS INC. |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 0.0 | 0.0
Generation | AEP TRANSMISSION COMPANY, LLC |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 0.0 | 0.0
Generation | APPALACHIAN POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 41.6 | 41.0
Generation | INDIANA MICHIGAN POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 16.6 | 28.2
Generation | OHIO POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 0.0 | 0.0
Generation | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 0.6 | 0.6
Generation | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 2.0 | 25.3
Other Property, Plant and Equipment |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 283.7 | 305.9
Other Property, Plant and Equipment | AEP TEXAS INC. |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 52.4 | 53.9
Other Property, Plant and Equipment | AEP TRANSMISSION COMPANY, LLC |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 0.0 | 0.0
Other Property, Plant and Equipment | APPALACHIAN POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 19.4 | 22.1
Other Property, Plant and Equipment | INDIANA MICHIGAN POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 38.8 | 42.3
Other Property, Plant and Equipment | OHIO POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 30.4 | 33.7
Other Property, Plant and Equipment | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 23.0 | 25.5
Other Property, Plant and Equipment | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 29.8 | 32.0
Total Property, Plant and Equipment |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 357.5 | 426.0
Total Property, Plant and Equipment | AEP TEXAS INC. |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 52.4 | 53.9
Total Property, Plant and Equipment | AEP TRANSMISSION COMPANY, LLC |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 0.0 | 0.0
Total Property, Plant and Equipment | APPALACHIAN POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 61.0 | 63.1
Total Property, Plant and Equipment | INDIANA MICHIGAN POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 55.4 | 70.5
Total Property, Plant and Equipment | OHIO POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 30.4 | 33.7
Total Property, Plant and Equipment | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 23.6 | 26.1
Total Property, Plant and Equipment | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 31.8 | 57.3
Accumulated Amortization |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 193.9 | 221.5
Accumulated Amortization | AEP TEXAS INC. |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 27.7 | 26.3
Accumulated Amortization | AEP TRANSMISSION COMPANY, LLC |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 0.0 | 0.0
Accumulated Amortization | APPALACHIAN POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 42.0 | 37.1
Accumulated Amortization | INDIANA MICHIGAN POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 33.4 | 39.0
Accumulated Amortization | OHIO POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 16.1 | 15.5
Accumulated Amortization | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | 11.3 | 12.3
Accumulated Amortization | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Lessee, Lease, Description [Line Items] |  |
Net Property, Plant and Equipment Under Finance Leases | $ 13.3 | $ 28.3

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