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Leases (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 26, 2024 | Jan. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Lease Rental Costs |  |  |  |  |  |
Operating Lease, Cost |  |  |  | $ 149.9 | $ 157.5 | $ 275.3
Finance Lease Right-of-Use Asset Amortization |  |  |  | 69.1 | 205.5 | 74.7
Interest Expense on Finance Leases |  |  |  | 11.9 | 13.4 | 14.4
Total Lease Rental Costs | [1] |  |  | $ 230.9 | $ 376.4 | 364.4
Supplemental Information Related to Leases |  |  |  |  |  |
Weighted-Average Remaining Lease Term, Operating Leases |  |  |  | 12 years 6 months 29 days | 12 years 8 months 8 days |
Weighted Average Remaining Lease Term, Finance Leases |  |  |  | 4 years 7 months 17 days | 4 years 7 months 9 days |
Weighted Average Discount Rate, Operating Leases |  |  |  | 3.73% | 3.54% |
Weighted Average Discount Rate, Finance Leases |  |  |  | 6.19% | 5.76% |
Operating Cash Flows Used for Operating Leases |  |  |  | $ 146.8 | $ 155.1 |
Operating Cash Flows Used for Finance Leases |  |  |  | 11.9 | 13.6 |
Financing Cash Flows Used for Finance Leases |  |  |  | 68.3 | 309.5 | 64.0
Non-cash Acquisitions Under Operating Leases |  |  |  | 99.8 | 191.4 |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 24,329.5 | 25,834.2 |
Other Property, Plant and Equipment |  |  |  | 6,484.9 | 5,971.8 |
Total Property, Plant and Equipment |  |  |  | 101,246.4 | 97,021.4 |
Accumulated Amortization |  |  |  | 24,553.0 | 23,682.3 |
Net Property, Plant and Equipment Under Finance Leases |  |  |  | 204.5 | 212.7 |
Other Liabilities, Noncurrent |  |  |  | 545.8 | 607.3 |
Finance Lease Liability Due Within One Year |  |  |  | 1,251.1 | 1,278.2 |
Total Obligations Under Finance Leases |  |  |  | 205.6 | 225.7 |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 620.2 | 645.5 |
Operating Lease Noncurrent Liability |  |  |  | 519.4 | 552.5 |
Operating Lease Liability Due Within One Year |  |  |  | 115.7 | 113.6 |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 635.1 | 666.1 |
Finance Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 76.8 |  |
Year 2 |  |  |  | 48.6 |  |
Year 3 |  |  |  | 33.0 |  |
Year 4 |  |  |  | 26.2 |  |
Year 5 |  |  |  | 19.2 |  |
Finance Leases, Later Years |  |  |  | 35.4 |  |
Finance Leases, Total Future Minimum Lease Payments |  |  |  | 239.2 |  |
Imputed Interest on Finance Leases |  |  |  | 33.6 |  |
Total Obligations Under Finance Leases |  |  |  | 205.6 | 225.7 |
Operating Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 141.6 |  |
Year 2 |  |  |  | 103.3 |  |
Year 3 |  |  |  | 92.0 |  |
Year 4 |  |  |  | 82.6 |  |
Year 5 |  |  |  | 67.4 |  |
Operating Leases, Later Years |  |  |  | 327.6 |  |
Operating Leases, Total Future Minimum Lease Payments |  |  |  | 814.5 |  |
Imputed Interest on Operating Leases |  |  |  | 179.4 |  |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 635.1 | 666.1 |
Maximum Potential Loss |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  |  |  | 45.3 |  |
Leases (Textuals) |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  | 2,196.1 | 2,345.4 | 2,989.3
Finance Lease Assets [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 120.1 | 120.9 |
Other Property, Plant and Equipment |  |  |  | 305.9 | 321.4 |
Total Property, Plant and Equipment |  |  |  | 426.0 | 442.3 |
Accumulated Amortization |  |  |  | 221.5 | 229.6 |
Finance Lease Liabilities [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Liabilities, Noncurrent |  |  |  | 139.9 | 168.4 |
Finance Lease Liability Due Within One Year |  |  |  | 65.7 | 57.3 |
Operating Lease Assets [Member] |  |  |  |  |  |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 620.2 | 645.5 |
AEP Texas Inc. [Member] |  |  |  |  |  |
Lease Rental Costs |  |  |  |  |  |
Operating Lease, Cost |  |  |  | 34.0 | 18.4 | 18.4
Finance Lease Right-of-Use Asset Amortization |  |  |  | 7.4 | 6.8 | 6.7
Interest Expense on Finance Leases |  |  |  | 1.4 | 1.3 | 1.4
Total Lease Rental Costs | [1] |  |  | $ 42.8 | $ 26.5 | 26.5
Supplemental Information Related to Leases |  |  |  |  |  |
Weighted-Average Remaining Lease Term, Operating Leases |  |  |  | 3 years 11 months 26 days | 4 years 3 months 29 days |
Weighted Average Remaining Lease Term, Finance Leases |  |  |  | 5 years 1 month 17 days | 5 years 4 months 20 days |
Weighted Average Discount Rate, Operating Leases |  |  |  | 4.23% | 4.15% |
Weighted Average Discount Rate, Finance Leases |  |  |  | 5.27% | 4.75% |
Operating Cash Flows Used for Operating Leases |  |  |  | $ 33.6 | $ 18.3 |
Operating Cash Flows Used for Finance Leases |  |  |  | 1.4 | 1.3 |
Financing Cash Flows Used for Finance Leases |  |  |  | 7.4 | 6.8 | 6.7
Non-cash Acquisitions Under Operating Leases |  |  |  | 12.4 | 36.7 |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Property, Plant and Equipment |  |  |  | 1,145.9 | 1,022.8 |
Total Property, Plant and Equipment |  |  |  | 14,661.9 | 13,442.3 |
Accumulated Amortization |  |  |  | 1,887.9 | 1,760.7 |
Net Property, Plant and Equipment Under Finance Leases |  |  |  | 27.6 | 30.1 |
Other Liabilities, Noncurrent |  |  |  | 111.3 | 93.2 |
Finance Lease Liability Due Within One Year |  |  |  | 152.7 | 130.7 |
Total Obligations Under Finance Leases |  |  |  | 27.6 | 30.1 |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Noncurrent Liability |  |  |  | 50.9 | 67.8 |
Operating Lease Liability Due Within One Year |  |  |  | 28.7 | 28.6 |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 79.6 | 96.4 |
Finance Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 8.3 |  |
Year 2 |  |  |  | 6.6 |  |
Year 3 |  |  |  | 5.1 |  |
Year 4 |  |  |  | 4.0 |  |
Year 5 |  |  |  | 2.8 |  |
Finance Leases, Later Years |  |  |  | 5.1 |  |
Finance Leases, Total Future Minimum Lease Payments |  |  |  | 31.9 |  |
Imputed Interest on Finance Leases |  |  |  | 4.3 |  |
Total Obligations Under Finance Leases |  |  |  | 27.6 | 30.1 |
Operating Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 32.1 |  |
Year 2 |  |  |  | 15.7 |  |
Year 3 |  |  |  | 13.3 |  |
Year 4 |  |  |  | 10.7 |  |
Year 5 |  |  |  | 7.8 |  |
Operating Leases, Later Years |  |  |  | 8.1 |  |
Operating Leases, Total Future Minimum Lease Payments |  |  |  | 87.7 |  |
Imputed Interest on Operating Leases |  |  |  | 8.1 |  |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 79.6 | 96.4 |
Maximum Potential Loss |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  |  |  | 10.9 |  |
Leases (Textuals) |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  | 278.5 | 716.0 | 88.7
AEP Texas Inc. [Member] | Finance Lease Assets [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 0.0 | 0.0 |
Other Property, Plant and Equipment |  |  |  | 53.9 | 53.7 |
Total Property, Plant and Equipment |  |  |  | 53.9 | 53.7 |
Accumulated Amortization |  |  |  | 26.3 | 23.6 |
AEP Texas Inc. [Member] | Finance Lease Liabilities [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Liabilities, Noncurrent |  |  |  | 20.6 | 23.1 |
Finance Lease Liability Due Within One Year |  |  |  | 7.0 | 7.0 |
AEP Texas Inc. [Member] | Operating Lease Assets [Member] |  |  |  |  |  |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 77.6 | 94.7 |
AEP Transmission Co [Member] |  |  |  |  |  |
Lease Rental Costs |  |  |  |  |  |
Operating Lease, Cost |  |  |  | 1.3 | 1.1 | 1.7
Finance Lease Right-of-Use Asset Amortization |  |  |  | 0.0 | 0.0 | 0.0
Interest Expense on Finance Leases |  |  |  | 0.0 | 0.0 | 0.0
Total Lease Rental Costs | [1] |  |  | $ 1.3 | $ 1.1 | 1.7
Supplemental Information Related to Leases |  |  |  |  |  |
Weighted-Average Remaining Lease Term, Operating Leases |  |  |  | 2 years 9 months 3 days | 2 years 18 days |
Weighted Average Remaining Lease Term, Finance Leases |  |  |  | 0 years | 0 years |
Weighted Average Discount Rate, Operating Leases |  |  |  | 3.61% | 1.96% |
Weighted Average Discount Rate, Finance Leases |  |  |  | 0.00% | 0.00% |
Operating Cash Flows Used for Operating Leases |  |  |  | $ 1.3 | $ 1.0 |
Operating Cash Flows Used for Finance Leases |  |  |  | 0.0 | 0.0 |
Financing Cash Flows Used for Finance Leases |  |  |  | 0.0 | 0.0 |
Non-cash Acquisitions Under Operating Leases |  |  |  | 1.2 | 1.7 |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Property, Plant and Equipment |  |  |  | 501.4 | 476.8 |
Total Property, Plant and Equipment |  |  |  | 15,789.0 | 14,366.9 |
Accumulated Amortization |  |  |  | 1,291.3 | 1,027.0 |
Net Property, Plant and Equipment Under Finance Leases |  |  |  | 0.0 | 0.0 |
Other Liabilities, Noncurrent |  |  |  | 200.9 | 69.1 |
Finance Lease Liability Due Within One Year |  |  |  | 24.7 | 8.3 |
Total Obligations Under Finance Leases |  |  |  | 0.0 | 0.0 |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Noncurrent Liability |  |  |  | 1.4 | 1.5 |
Operating Lease Liability Due Within One Year |  |  |  | 1.3 | 1.3 |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 2.7 | 2.8 |
Finance Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 0.0 |  |
Year 2 |  |  |  | 0.0 |  |
Year 3 |  |  |  | 0.0 |  |
Year 4 |  |  |  | 0.0 |  |
Year 5 |  |  |  | 0.0 |  |
Finance Leases, Later Years |  |  |  | 0.0 |  |
Finance Leases, Total Future Minimum Lease Payments |  |  |  | 0.0 |  |
Imputed Interest on Finance Leases |  |  |  | 0.0 |  |
Total Obligations Under Finance Leases |  |  |  | 0.0 | 0.0 |
Operating Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 1.4 |  |
Year 2 |  |  |  | 0.7 |  |
Year 3 |  |  |  | 0.4 |  |
Year 4 |  |  |  | 0.2 |  |
Year 5 |  |  |  | 0.1 |  |
Operating Leases, Later Years |  |  |  | 0.0 |  |
Operating Leases, Total Future Minimum Lease Payments |  |  |  | 2.8 |  |
Imputed Interest on Operating Leases |  |  |  | 0.1 |  |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 2.7 | 2.8 |
Leases (Textuals) |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  | 60.0 | 104.0 | 50.0
AEP Transmission Co [Member] | Finance Lease Assets [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 0.0 | 0.0 |
Other Property, Plant and Equipment |  |  |  | 0.0 | 0.0 |
Total Property, Plant and Equipment |  |  |  | 0.0 | 0.0 |
Accumulated Amortization |  |  |  | 0.0 | 0.0 |
AEP Transmission Co [Member] | Finance Lease Liabilities [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Liabilities, Noncurrent |  |  |  | 0.0 | 0.0 |
Finance Lease Liability Due Within One Year |  |  |  | 0.0 | 0.0 |
AEP Transmission Co [Member] | Operating Lease Assets [Member] |  |  |  |  |  |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 2.6 | 2.7 |
Appalachian Power Co [Member] |  |  |  |  |  |
Lease Rental Costs |  |  |  |  |  |
Operating Lease, Cost |  |  |  | 18.5 | 17.9 | 19.3
Finance Lease Right-of-Use Asset Amortization |  |  |  | 8.3 | 7.9 | 7.7
Interest Expense on Finance Leases |  |  |  | 1.8 | 2.0 | 2.4
Total Lease Rental Costs | [1] |  |  | $ 28.6 | $ 27.8 | 29.4
Supplemental Information Related to Leases |  |  |  |  |  |
Weighted-Average Remaining Lease Term, Operating Leases |  |  |  | 6 years 3 days | 5 years 3 months 14 days |
Weighted Average Remaining Lease Term, Finance Leases |  |  |  | 4 years 1 month 28 days | 4 years 3 months |
Weighted Average Discount Rate, Operating Leases |  |  |  | 3.50% | 3.61% |
Weighted Average Discount Rate, Finance Leases |  |  |  | 7.04% | 7.09% |
Operating Cash Flows Used for Operating Leases |  |  |  | $ 18.3 | $ 17.9 |
Operating Cash Flows Used for Finance Leases |  |  |  | 1.8 | 2.0 |
Financing Cash Flows Used for Finance Leases |  |  |  | 8.3 | 7.9 | 7.7
Non-cash Acquisitions Under Operating Leases |  |  |  | 15.7 | 23.1 |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 7,041.3 | 6,776.8 |
Other Property, Plant and Equipment |  |  |  | 981.3 | 883.3 |
Total Property, Plant and Equipment |  |  |  | 18,620.2 | 17,781.2 |
Accumulated Amortization |  |  |  | 5,688.7 | 5,402.0 |
Net Property, Plant and Equipment Under Finance Leases |  |  |  | 26.0 | 29.3 |
Other Liabilities, Noncurrent |  |  |  | 70.9 | 49.6 |
Finance Lease Liability Due Within One Year |  |  |  | 193.6 | 171.2 |
Total Obligations Under Finance Leases |  |  |  | 26.0 | 29.3 |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 73.7 | 73.6 |
Operating Lease Noncurrent Liability |  |  |  | 59.8 | 59.1 |
Operating Lease Liability Due Within One Year |  |  |  | 14.6 | 15.0 |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 74.4 | 74.1 |
Finance Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 9.9 |  |
Year 2 |  |  |  | 8.5 |  |
Year 3 |  |  |  | 3.5 |  |
Year 4 |  |  |  | 2.3 |  |
Year 5 |  |  |  | 1.9 |  |
Finance Leases, Later Years |  |  |  | 3.4 |  |
Finance Leases, Total Future Minimum Lease Payments |  |  |  | 29.5 |  |
Imputed Interest on Finance Leases |  |  |  | 3.5 |  |
Total Obligations Under Finance Leases |  |  |  | 26.0 | 29.3 |
Operating Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 17.8 |  |
Year 2 |  |  |  | 14.8 |  |
Year 3 |  |  |  | 13.3 |  |
Year 4 |  |  |  | 12.1 |  |
Year 5 |  |  |  | 10.0 |  |
Operating Leases, Later Years |  |  |  | 16.8 |  |
Operating Leases, Total Future Minimum Lease Payments |  |  |  | 84.8 |  |
Imputed Interest on Operating Leases |  |  |  | 10.4 |  |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 74.4 | 74.1 |
Maximum Potential Loss |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  |  |  | 5.8 |  |
Leases (Textuals) |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  | 26.6 | 230.4 | 393.0
Appalachian Power Co [Member] | Finance Lease Assets [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 41.0 | 41.1 |
Other Property, Plant and Equipment |  |  |  | 22.1 | 20.1 |
Total Property, Plant and Equipment |  |  |  | 63.1 | 61.2 |
Accumulated Amortization |  |  |  | 37.1 | 31.9 |
Appalachian Power Co [Member] | Finance Lease Liabilities [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Liabilities, Noncurrent |  |  |  | 17.8 | 21.6 |
Finance Lease Liability Due Within One Year |  |  |  | 8.2 | 7.7 |
Appalachian Power Co [Member] | Operating Lease Assets [Member] |  |  |  |  |  |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 73.7 | 73.6 |
Indiana Michigan Power Co [Member] |  |  |  |  |  |
Lease Rental Costs |  |  |  |  |  |
Operating Lease, Cost |  |  |  | 19.6 | 29.5 | 90.2
Finance Lease Right-of-Use Asset Amortization |  |  |  | 7.3 | 78.7 | 12.9
Interest Expense on Finance Leases |  |  |  | 2.5 | 3.1 | 3.0
Total Lease Rental Costs | [1] |  |  | $ 29.4 | $ 111.3 | 106.1
Supplemental Information Related to Leases |  |  |  |  |  |
Weighted-Average Remaining Lease Term, Operating Leases |  |  |  | 4 years 6 months 10 days | 5 years 9 months 14 days |
Weighted Average Remaining Lease Term, Finance Leases |  |  |  | 4 years 11 months 12 days | 4 years 9 months 3 days |
Weighted Average Discount Rate, Operating Leases |  |  |  | 3.89% | 3.62% |
Weighted Average Discount Rate, Finance Leases |  |  |  | 8.62% | 8.99% |
Operating Cash Flows Used for Operating Leases |  |  |  | $ 19.5 | $ 29.7 |
Operating Cash Flows Used for Finance Leases |  |  |  | 2.5 | 3.2 |
Financing Cash Flows Used for Finance Leases |  |  |  | 7.4 | 130.7 | 6.8
Non-cash Acquisitions Under Operating Leases |  |  |  | 7.9 | 19.1 |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 5,646.8 | 5,585.1 |
Other Property, Plant and Equipment |  |  |  | 898.5 | 839.3 |
Total Property, Plant and Equipment |  |  |  | 12,007.4 | 11,544.3 |
Accumulated Amortization |  |  |  | 4,378.4 | 4,132.8 |
Net Property, Plant and Equipment Under Finance Leases |  |  |  | 31.5 | 33.8 |
Other Liabilities, Noncurrent |  |  |  | 57.7 | 58.8 |
Finance Lease Liability Due Within One Year |  |  |  | 91.9 | 105.8 |
Total Obligations Under Finance Leases |  |  |  | 31.5 | 34.0 |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 53.8 | 64.3 |
Operating Lease Noncurrent Liability |  |  |  | 37.7 | 48.9 |
Operating Lease Liability Due Within One Year |  |  |  | 16.8 | 16.0 |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 54.5 | 64.9 |
Finance Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 12.8 |  |
Year 2 |  |  |  | 7.2 |  |
Year 3 |  |  |  | 4.5 |  |
Year 4 |  |  |  | 4.0 |  |
Year 5 |  |  |  | 3.3 |  |
Finance Leases, Later Years |  |  |  | 7.3 |  |
Finance Leases, Total Future Minimum Lease Payments |  |  |  | 39.1 |  |
Imputed Interest on Finance Leases |  |  |  | 7.6 |  |
Total Obligations Under Finance Leases |  |  |  | 31.5 | 34.0 |
Operating Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 18.9 |  |
Year 2 |  |  |  | 10.6 |  |
Year 3 |  |  |  | 9.7 |  |
Year 4 |  |  |  | 8.9 |  |
Year 5 |  |  |  | 7.0 |  |
Operating Leases, Later Years |  |  |  | 4.8 |  |
Operating Leases, Total Future Minimum Lease Payments |  |  |  | 59.9 |  |
Imputed Interest on Operating Leases |  |  |  | 5.4 |  |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 54.5 | 64.9 |
Maximum Potential Loss |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  |  |  | 4.1 |  |
Leases (Textuals) |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  | 343.3 | 83.4 | 383.5
Indiana Michigan Power Co [Member] | Notes Payable, Other Payables [Member] | Subsequent Event [Member] |  |  |  |  |  |
Leases (Textuals) |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 8.0 | $ 8.0 |  |  |
Indiana Michigan Power Co [Member] | Finance Lease Assets [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 28.2 | 28.0 |
Other Property, Plant and Equipment |  |  |  | 42.3 | 40.6 |
Total Property, Plant and Equipment |  |  |  | 70.5 | 68.6 |
Accumulated Amortization |  |  |  | 39.0 | 34.8 |
Indiana Michigan Power Co [Member] | Finance Lease Liabilities [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Liabilities, Noncurrent |  |  |  | 20.8 | 27.1 |
Finance Lease Liability Due Within One Year |  |  |  | 10.7 | 6.9 |
Indiana Michigan Power Co [Member] | Operating Lease Assets [Member] |  |  |  |  |  |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 53.8 | 64.3 |
Ohio Power Co [Member] |  |  |  |  |  |
Lease Rental Costs |  |  |  |  |  |
Operating Lease, Cost |  |  |  | 17.3 | 16.9 | 19.0
Finance Lease Right-of-Use Asset Amortization |  |  |  | 5.0 | 4.9 | 4.9
Interest Expense on Finance Leases |  |  |  | 0.9 | 0.8 | 0.8
Total Lease Rental Costs | [1] |  |  | $ 23.2 | $ 22.6 | 24.7
Supplemental Information Related to Leases |  |  |  |  |  |
Weighted-Average Remaining Lease Term, Operating Leases |  |  |  | 5 years 4 months 9 days | 5 years 11 months 23 days |
Weighted Average Remaining Lease Term, Finance Leases |  |  |  | 4 years 11 months 19 days | 5 years 3 months 7 days |
Weighted Average Discount Rate, Operating Leases |  |  |  | 3.93% | 3.73% |
Weighted Average Discount Rate, Finance Leases |  |  |  | 5.32% | 4.53% |
Operating Cash Flows Used for Operating Leases |  |  |  | $ 17.0 | $ 17.5 |
Operating Cash Flows Used for Finance Leases |  |  |  | 0.9 | 0.8 |
Financing Cash Flows Used for Finance Leases |  |  |  | 5.0 | 4.9 | 4.9
Non-cash Acquisitions Under Operating Leases |  |  |  | 10.2 | 8.4 |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Property, Plant and Equipment |  |  |  | 1,125.0 | 1,051.4 |
Total Property, Plant and Equipment |  |  |  | 12,013.5 | 11,174.6 |
Accumulated Amortization |  |  |  | 2,713.6 | 2,565.3 |
Net Property, Plant and Equipment Under Finance Leases |  |  |  | 18.2 | 18.9 |
Other Liabilities, Noncurrent |  |  |  | 34.4 | 66.0 |
Finance Lease Liability Due Within One Year |  |  |  | 183.3 | 154.2 |
Total Obligations Under Finance Leases |  |  |  | 18.2 | 18.9 |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 69.9 | 73.8 |
Operating Lease Noncurrent Liability |  |  |  | 56.7 | 60.3 |
Operating Lease Liability Due Within One Year |  |  |  | 13.5 | 13.5 |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 70.2 | 73.8 |
Finance Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 5.8 |  |
Year 2 |  |  |  | 4.3 |  |
Year 3 |  |  |  | 3.1 |  |
Year 4 |  |  |  | 2.5 |  |
Year 5 |  |  |  | 2.0 |  |
Finance Leases, Later Years |  |  |  | 3.2 |  |
Finance Leases, Total Future Minimum Lease Payments |  |  |  | 20.9 |  |
Imputed Interest on Finance Leases |  |  |  | 2.7 |  |
Total Obligations Under Finance Leases |  |  |  | 18.2 | 18.9 |
Operating Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 16.9 |  |
Year 2 |  |  |  | 15.3 |  |
Year 3 |  |  |  | 14.1 |  |
Year 4 |  |  |  | 12.8 |  |
Year 5 |  |  |  | 10.6 |  |
Operating Leases, Later Years |  |  |  | 9.1 |  |
Operating Leases, Total Future Minimum Lease Payments |  |  |  | 78.8 |  |
Imputed Interest on Operating Leases |  |  |  | 8.6 |  |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 70.2 | 73.8 |
Maximum Potential Loss |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  |  |  | 7.2 |  |
Leases (Textuals) |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  | 0.6 | 0.1 | 500.1
Ohio Power Co [Member] | Finance Lease Assets [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 0.0 | 0.0 |
Other Property, Plant and Equipment |  |  |  | 33.7 | 32.7 |
Total Property, Plant and Equipment |  |  |  | 33.7 | 32.7 |
Accumulated Amortization |  |  |  | 15.5 | 13.8 |
Ohio Power Co [Member] | Finance Lease Liabilities [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Liabilities, Noncurrent |  |  |  | 13.2 | 14.2 |
Finance Lease Liability Due Within One Year |  |  |  | 5.0 | 4.7 |
Ohio Power Co [Member] | Operating Lease Assets [Member] |  |  |  |  |  |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 69.9 | 73.8 |
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Lease Rental Costs |  |  |  |  |  |
Operating Lease, Cost |  |  |  | 13.5 | 11.8 | 8.7
Finance Lease Right-of-Use Asset Amortization |  |  |  | 3.3 | 3.2 | 3.2
Interest Expense on Finance Leases |  |  |  | 0.7 | 0.6 | 0.6
Total Lease Rental Costs | [1] |  |  | $ 17.5 | $ 15.6 | 12.5
Supplemental Information Related to Leases |  |  |  |  |  |
Weighted-Average Remaining Lease Term, Operating Leases |  |  |  | 23 years 10 months 6 days | 23 years 10 months 24 days |
Weighted Average Remaining Lease Term, Finance Leases |  |  |  | 5 years 9 months 3 days | 6 years 7 days |
Weighted Average Discount Rate, Operating Leases |  |  |  | 3.72% | 3.43% |
Weighted Average Discount Rate, Finance Leases |  |  |  | 5.14% | 4.63% |
Operating Cash Flows Used for Operating Leases |  |  |  | $ 12.5 | $ 10.5 |
Operating Cash Flows Used for Finance Leases |  |  |  | 0.7 | 0.6 |
Financing Cash Flows Used for Finance Leases |  |  |  | 3.3 | 3.2 | 3.2
Non-cash Acquisitions Under Operating Leases |  |  |  | 15.5 | 46.0 |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 2,695.5 | 2,394.8 |
Other Property, Plant and Equipment |  |  |  | 505.9 | 469.3 |
Total Property, Plant and Equipment |  |  |  | 8,194.2 | 7,464.2 |
Accumulated Amortization |  |  |  | 2,081.9 | 1,837.7 |
Net Property, Plant and Equipment Under Finance Leases |  |  |  | 13.8 | 15.0 |
Other Liabilities, Noncurrent |  |  |  | 33.8 | 21.3 |
Finance Lease Liability Due Within One Year |  |  |  | 106.2 | 82.0 |
Total Obligations Under Finance Leases |  |  |  | 13.8 | 15.0 |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 112.8 | 106.1 |
Operating Lease Noncurrent Liability |  |  |  | 106.8 | 99.3 |
Operating Lease Liability Due Within One Year |  |  |  | 10.1 | 8.9 |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 116.9 | 108.2 |
Finance Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 3.7 |  |
Year 2 |  |  |  | 2.9 |  |
Year 3 |  |  |  | 2.5 |  |
Year 4 |  |  |  | 2.0 |  |
Year 5 |  |  |  | 1.7 |  |
Finance Leases, Later Years |  |  |  | 3.3 |  |
Finance Leases, Total Future Minimum Lease Payments |  |  |  | 16.1 |  |
Imputed Interest on Finance Leases |  |  |  | 2.3 |  |
Total Obligations Under Finance Leases |  |  |  | 13.8 | 15.0 |
Operating Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 12.2 |  |
Year 2 |  |  |  | 11.1 |  |
Year 3 |  |  |  | 10.3 |  |
Year 4 |  |  |  | 9.3 |  |
Year 5 |  |  |  | 7.9 |  |
Operating Leases, Later Years |  |  |  | 129.1 |  |
Operating Leases, Total Future Minimum Lease Payments |  |  |  | 179.9 |  |
Imputed Interest on Operating Leases |  |  |  | 63.0 |  |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 116.9 | 108.2 |
Maximum Potential Loss |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  |  |  | 4.7 |  |
Leases (Textuals) |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  | 0.5 | 500.5 | 750.5
Public Service Co Of Oklahoma [Member] | Finance Lease Assets [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 0.6 | 0.6 |
Other Property, Plant and Equipment |  |  |  | 25.5 | 25.2 |
Total Property, Plant and Equipment |  |  |  | 26.1 | 25.8 |
Accumulated Amortization |  |  |  | 12.3 | 10.8 |
Public Service Co Of Oklahoma [Member] | Finance Lease Liabilities [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Liabilities, Noncurrent |  |  |  | 10.7 | 11.7 |
Finance Lease Liability Due Within One Year |  |  |  | 3.1 | 3.3 |
Public Service Co Of Oklahoma [Member] | Operating Lease Assets [Member] |  |  |  |  |  |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | 112.8 | 106.1 |
Southwestern Electric Power Co [Member] |  |  |  |  |  |
Lease Rental Costs |  |  |  |  |  |
Operating Lease, Cost |  |  |  | 17.5 | 15.3 | 12.1
Finance Lease Right-of-Use Asset Amortization |  |  |  | 19.9 | 10.8 | 11.0
Interest Expense on Finance Leases |  |  |  | 1.4 | 2.1 | 2.5
Total Lease Rental Costs | [1] |  |  | $ 38.8 | $ 28.2 | 25.6
Supplemental Information Related to Leases |  |  |  |  |  |
Weighted-Average Remaining Lease Term, Operating Leases |  |  |  | 22 years 6 months | 23 years 6 months 18 days |
Weighted Average Remaining Lease Term, Finance Leases |  |  |  | 4 years 9 months 10 days | 4 years 1 month 17 days |
Weighted Average Discount Rate, Operating Leases |  |  |  | 3.53% | 3.41% |
Weighted Average Discount Rate, Finance Leases |  |  |  | 5.22% | 4.80% |
Operating Cash Flows Used for Operating Leases |  |  |  | $ 16.5 | $ 13.7 |
Operating Cash Flows Used for Finance Leases |  |  |  | 1.4 | 2.1 |
Financing Cash Flows Used for Finance Leases |  |  |  | 19.1 | 10.8 | 10.9
Non-cash Acquisitions Under Operating Leases |  |  |  | 14.3 | 53.6 |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 4,790.7 | 5,476.2 |
Other Property, Plant and Equipment |  |  |  | 814.4 | 804.4 |
Total Property, Plant and Equipment |  |  |  | 11,645.6 | 11,789.5 |
Accumulated Amortization |  |  |  | 3,087.2 | 3,527.3 |
Net Property, Plant and Equipment Under Finance Leases |  |  |  | 29.0 | 29.6 |
Other Liabilities, Noncurrent |  |  |  | 93.8 | 68.4 |
Finance Lease Liability Due Within One Year |  |  |  | 154.6 | 172.0 |
Total Obligations Under Finance Leases |  |  |  | 30.1 | 42.2 |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Noncurrent Liability |  |  |  | 122.5 | 120.2 |
Operating Lease Liability Due Within One Year |  |  |  | 9.0 | 8.4 |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 131.5 | 128.6 |
Finance Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 12.6 |  |
Year 2 |  |  |  | 4.6 |  |
Year 3 |  |  |  | 3.9 |  |
Year 4 |  |  |  | 3.5 |  |
Year 5 |  |  |  | 3.0 |  |
Finance Leases, Later Years |  |  |  | 7.2 |  |
Finance Leases, Total Future Minimum Lease Payments |  |  |  | 34.8 |  |
Imputed Interest on Finance Leases |  |  |  | 4.7 |  |
Total Obligations Under Finance Leases |  |  |  | 30.1 | 42.2 |
Operating Lease Liabilities Rolling Future Minimum Lease Payments |  |  |  |  |  |
Year 1 |  |  |  | 16.2 |  |
Year 2 |  |  |  | 15.0 |  |
Year 3 |  |  |  | 12.9 |  |
Year 4 |  |  |  | 11.5 |  |
Year 5 |  |  |  | 9.5 |  |
Operating Leases, Later Years |  |  |  | 135.6 |  |
Operating Leases, Total Future Minimum Lease Payments |  |  |  | 200.7 |  |
Imputed Interest on Operating Leases |  |  |  | 69.2 |  |
Estimated Present Value of Future Minimum Lease Payments on Operating Leases |  |  |  | 131.5 | 128.6 |
Maximum Potential Loss |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  |  |  | 5.4 |  |
Leases (Textuals) |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  | 94.1 | 6.2 | $ 381.2
Southwestern Electric Power Co [Member] | Finance Lease Assets [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Generation |  |  |  | 25.3 | 25.9 |
Other Property, Plant and Equipment |  |  |  | 32.0 | 58.3 |
Total Property, Plant and Equipment |  |  |  | 57.3 | 84.2 |
Accumulated Amortization |  |  |  | 28.3 | 54.6 |
Southwestern Electric Power Co [Member] | Finance Lease Liabilities [Member] |  |  |  |  |  |
Property, Plant and Equipment and Other Related Obligations Under Finance Leases |  |  |  |  |  |
Other Liabilities, Noncurrent |  |  |  | 18.8 | 31.3 |
Finance Lease Liability Due Within One Year |  |  |  | 11.3 | 10.9 |
Southwestern Electric Power Co [Member] | Operating Lease Assets [Member] |  |  |  |  |  |
Operating Lease Asset and Related Obligations |  |  |  |  |  |
Operating Lease Assets |  |  |  | $ 126.3 | $ 123.4 |
[1] | Excludes variable and short-term lease costs, which were immaterial.

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