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Leases (Tables) | 12 Months Ended
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Dec. 31, 2023
Lease Rental Costs |
Year Ended December 31, 2023 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Operating Lease Cost |  | $ | 149.9 |  |  | $ | 34.0 |  |  | $ | 1.3 |  |  | $ | 18.5 |  |  | $ | 19.6 |  |  | $ | 17.3 |  |  | $ | 13.5 |  |  | $ | 17.5 |
Finance Lease Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Right-of-Use Assets |  | 69.1 |  |  | 7.4 |  |  | — |  |  | 8.3 |  |  | 7.3 |  |  | 5.0 |  |  | 3.3 |  |  | 19.9 |
Interest on Lease Liabilities |  | 11.9 |  |  | 1.4 |  |  | — |  |  | 1.8 |  |  | 2.5 |  |  | 0.9 |  |  | 0.7 |  |  | 1.4 |
Total Lease Rental Costs (a) |  | $ | 230.9 |  |  | $ | 42.8 |  |  | $ | 1.3 |  |  | $ | 28.6 |  |  | $ | 29.4 |  |  | $ | 23.2 |  |  | $ | 17.5 |  |  | $ | 38.8 |
Year Ended December 31, 2022 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Operating Lease Cost |  | $ | 157.5 |  |  | $ | 18.4 |  |  | $ | 1.1 |  |  | $ | 17.9 |  |  | $ | 29.5 |  |  | $ | 16.9 |  |  | $ | 11.8 |  |  | $ | 15.3 |
Finance Lease Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Right-of-Use Assets |  | 205.5 |  |  | 6.8 |  |  | — |  |  | 7.9 |  |  | 78.7 |  |  | 4.9 |  |  | 3.2 |  |  | 10.8 |
Interest on Lease Liabilities |  | 13.4 |  |  | 1.3 |  |  | — |  |  | 2.0 |  |  | 3.1 |  |  | 0.8 |  |  | 0.6 |  |  | 2.1 |
Total Lease Rental Costs (a) |  | $ | 376.4 |  |  | $ | 26.5 |  |  | $ | 1.1 |  |  | $ | 27.8 |  |  | $ | 111.3 |  |  | $ | 22.6 |  |  | $ | 15.6 |  |  | $ | 28.2 |
Year Ended December 31, 2021 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Operating Lease Cost |  | $ | 275.3 |  |  | $ | 18.4 |  |  | $ | 1.7 |  |  | $ | 19.3 |  |  | $ | 90.2 |  |  | $ | 19.0 |  |  | $ | 8.7 |  |  | $ | 12.1 |
Finance Lease Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Right-of-Use Assets |  | 74.7 |  |  | 6.7 |  |  | — |  |  | 7.7 |  |  | 12.9 |  |  | 4.9 |  |  | 3.2 |  |  | 11.0 |
Interest on Lease Liabilities |  | 14.4 |  |  | 1.4 |  |  | — |  |  | 2.4 |  |  | 3.0 |  |  | 0.8 |  |  | 0.6 |  |  | 2.5 |
Total Lease Rental Costs (a) |  | $ | 364.4 |  |  | $ | 26.5 |  |  | $ | 1.7 |  |  | $ | 29.4 |  |  | $ | 106.1 |  |  | $ | 24.7 |  |  | $ | 12.5 |  |  | $ | 25.6 |
(a)Excludes variable and short-term lease costs, which were immaterial.
Supplemental Balance Sheet Information Related to Leases |
December 31, 2023 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Weighted-Average Remaining Lease Term (years): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases |  | 12.58 |  | 3.99 |  | 2.76 |  | 6.01 |  | 4.53 |  | 5.36 |  | 23.85 |  | 22.50
Finance Leases |  | 4.63 |  | 5.13 |  | 0.00 |  | 4.16 |  | 4.95 |  | 4.97 |  | 5.76 |  | 4.78
Weighted-Average Discount Rate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases |  | 3.73 | % |  | 4.23 | % |  | 3.61 | % |  | 3.50 | % |  | 3.89 | % |  | 3.93 | % |  | 3.72 | % |  | 3.53 | %
Finance Leases |  | 6.19 | % |  | 5.27 | % |  | — | % |  | 7.04 | % |  | 8.62 | % |  | 5.32 | % |  | 5.14 | % |  | 5.22 | %
December 31, 2022 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
Weighted-Average Remaining Lease Term (years): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases |  | 12.69 |  | 4.33 |  | 2.05 |  | 5.29 |  | 5.79 |  | 5.98 |  | 23.90 |  | 23.55
Finance Leases |  | 4.61 |  | 5.39 |  | 0.00 |  | 4.25 |  | 4.76 |  | 5.27 |  | 6.02 |  | 4.13
Weighted-Average Discount Rate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases |  | 3.54 | % |  | 4.15 | % |  | 1.96 | % |  | 3.61 | % |  | 3.62 | % |  | 3.73 | % |  | 3.43 | % |  | 3.41 | %
Finance Leases |  | 5.76 | % |  | 4.75 | % |  | — | % |  | 7.09 | % |  | 8.99 | % |  | 4.53 | % |  | 4.63 | % |  | 4.80 | %
Year Ended December 31, 2023 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Cash Flows Used for Operating Leases |  | $ | 146.8 |  |  | $ | 33.6 |  |  | $ | 1.3 |  |  | $ | 18.3 |  |  | $ | 19.5 |  |  | $ | 17.0 |  |  | $ | 12.5 |  |  | $ | 16.5 |
Operating Cash Flows Used for Finance Leases |  | 11.9 |  |  | 1.4 |  |  | — |  |  | 1.8 |  |  | 2.5 |  |  | 0.9 |  |  | 0.7 |  |  | 1.4 |
Financing Cash Flows Used for Finance Leases |  | 68.3 |  |  | 7.4 |  |  | — |  |  | 8.3 |  |  | 7.4 |  |  | 5.0 |  |  | 3.3 |  |  | 19.1 |
Non-cash Acquisitions Under Operating Leases |  | $ | 99.8 |  |  | $ | 12.4 |  |  | $ | 1.2 |  |  | $ | 15.7 |  |  | $ | 7.9 |  |  | $ | 10.2 |  |  | $ | 15.5 |  |  | $ | 14.3 |
Year Ended December 31, 2022 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Cash Flows Used for Operating Leases |  | $ | 155.1 |  |  | $ | 18.3 |  |  | $ | 1.0 |  |  | $ | 17.9 |  |  | $ | 29.7 |  |  | $ | 17.5 |  |  | $ | 10.5 |  |  | $ | 13.7 |
Operating Cash Flows Used for Finance Leases |  | 13.6 |  |  | 1.3 |  |  | — |  |  | 2.0 |  |  | 3.2 |  |  | 0.8 |  |  | 0.6 |  |  | 2.1 |
Financing Cash Flows Used for Finance Leases |  | 309.5 |  |  | 6.8 |  |  | — |  |  | 7.9 |  |  | 130.7 |  |  | 4.9 |  |  | 3.2 |  |  | 10.8 |
Non-cash Acquisitions Under Operating Leases |  | $ | 191.4 |  |  | $ | 36.7 |  |  | $ | 1.7 |  |  | $ | 23.1 |  |  | $ | 19.1 |  |  | $ | 8.4 |  |  | $ | 46.0 |  |  | $ | 53.6 |
Property, Plant and Equipment and Related Obligations Under Finance Leases |
December 31, 2023 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Property, Plant and Equipment Under Finance Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation |  | $ | 120.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 41.0 |  |  | $ | 28.2 |  |  | $ | — |  |  | $ | 0.6 |  |  | $ | 25.3 |
Other Property, Plant and Equipment |  | 305.9 |  |  | 53.9 |  |  | — |  |  | 22.1 |  |  | 42.3 |  |  | 33.7 |  |  | 25.5 |  |  | 32.0 |
Total Property, Plant and Equipment |  | 426.0 |  |  | 53.9 |  |  | — |  |  | 63.1 |  |  | 70.5 |  |  | 33.7 |  |  | 26.1 |  |  | 57.3 |
Accumulated Amortization |  | 221.5 |  |  | 26.3 |  |  | — |  |  | 37.1 |  |  | 39.0 |  |  | 15.5 |  |  | 12.3 |  |  | 28.3 |
Net Property, Plant and Equipment Under Finance Leases |  | $ | 204.5 |  |  | $ | 27.6 |  |  | $ | — |  |  | $ | 26.0 |  |  | $ | 31.5 |  |  | $ | 18.2 |  |  | $ | 13.8 |  |  | $ | 29.0 |
Obligations Under Finance Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent Liability |  | $ | 139.9 |  |  | $ | 20.6 |  |  | $ | — |  |  | $ | 17.8 |  |  | $ | 20.8 |  |  | $ | 13.2 |  |  | $ | 10.7 |  |  | $ | 18.8 |
Liability Due Within One Year |  | 65.7 |  |  | 7.0 |  |  | — |  |  | 8.2 |  |  | 10.7 |  |  | 5.0 |  |  | 3.1 |  |  | 11.3 |
Total Obligations Under Finance Leases |  | $ | 205.6 |  |  | $ | 27.6 |  |  | $ | — |  |  | $ | 26.0 |  |  | $ | 31.5 |  |  | $ | 18.2 |  |  | $ | 13.8 |  |  | $ | 30.1 |
December 31, 2022 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Property, Plant and Equipment Under Finance Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation |  | $ | 120.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 41.1 |  |  | $ | 28.0 |  |  | $ | — |  |  | $ | 0.6 |  |  | $ | 25.9 |
Other Property, Plant and Equipment |  | 321.4 |  |  | 53.7 |  |  | — |  |  | 20.1 |  |  | 40.6 |  |  | 32.7 |  |  | 25.2 |  |  | 58.3 |
Total Property, Plant and Equipment |  | 442.3 |  |  | 53.7 |  |  | — |  |  | 61.2 |  |  | 68.6 |  |  | 32.7 |  |  | 25.8 |  |  | 84.2 |
Accumulated Amortization |  | 229.6 |  |  | 23.6 |  |  | — |  |  | 31.9 |  |  | 34.8 |  |  | 13.8 |  |  | 10.8 |  |  | 54.6 |
Net Property, Plant and Equipment Under Finance Leases |  | $ | 212.7 |  |  | $ | 30.1 |  |  | $ | — |  |  | $ | 29.3 |  |  | $ | 33.8 |  |  | $ | 18.9 |  |  | $ | 15.0 |  |  | $ | 29.6 |
Obligations Under Finance Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent Liability |  | $ | 168.4 |  |  | $ | 23.1 |  |  | $ | — |  |  | $ | 21.6 |  |  | $ | 27.1 |  |  | $ | 14.2 |  |  | $ | 11.7 |  |  | $ | 31.3 |
Liability Due Within One Year |  | 57.3 |  |  | 7.0 |  |  | — |  |  | 7.7 |  |  | 6.9 |  |  | 4.7 |  |  | 3.3 |  |  | 10.9 |
Total Obligations Under Finance Leases |  | $ | 225.7 |  |  | $ | 30.1 |  |  | $ | — |  |  | $ | 29.3 |  |  | $ | 34.0 |  |  | $ | 18.9 |  |  | $ | 15.0 |  |  | $ | 42.2 |
Operating Lease Assets and Related Obligations |
December 31, 2023 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Operating Lease Assets |  | $ | 620.2 |  |  | $ | 77.6 |  |  | $ | 2.6 |  |  | $ | 73.7 |  |  | $ | 53.8 |  |  | $ | 69.9 |  |  | $ | 112.8 |  |  | $ | 126.3 |
Obligations Under Operating Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent Liability |  | $ | 519.4 |  |  | $ | 50.9 |  |  | $ | 1.4 |  |  | $ | 59.8 |  |  | $ | 37.7 |  |  | $ | 56.7 |  |  | $ | 106.8 |  |  | $ | 122.5 |
Liability Due Within One Year |  | 115.7 |  |  | 28.7 |  |  | 1.3 |  |  | 14.6 |  |  | 16.8 |  |  | 13.5 |  |  | 10.1 |  |  | 9.0 |
Total Obligations Under Operating Leases |  | $ | 635.1 |  |  | $ | 79.6 |  |  | $ | 2.7 |  |  | $ | 74.4 |  |  | $ | 54.5 |  |  | $ | 70.2 |  |  | $ | 116.9 |  |  | $ | 131.5 |
December 31, 2022 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Operating Lease Assets |  | $ | 645.5 |  |  | $ | 94.7 |  |  | $ | 2.7 |  |  | $ | 73.6 |  |  | $ | 64.3 |  |  | $ | 73.8 |  |  | $ | 106.1 |  |  | $ | 123.4 |
Obligations Under Operating Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent Liability |  | $ | 552.5 |  |  | $ | 67.8 |  |  | $ | 1.5 |  |  | $ | 59.1 |  |  | $ | 48.9 |  |  | $ | 60.3 |  |  | $ | 99.3 |  |  | $ | 120.2 |
Liability Due Within One Year |  | 113.6 |  |  | 28.6 |  |  | 1.3 |  |  | 15.0 |  |  | 16.0 |  |  | 13.5 |  |  | 8.9 |  |  | 8.4 |
Total Obligations Under Operating Leases |  | $ | 666.1 |  |  | $ | 96.4 |  |  | $ | 2.8 |  |  | $ | 74.1 |  |  | $ | 64.9 |  |  | $ | 73.8 |  |  | $ | 108.2 |  |  | $ | 128.6 |
Finance Lease Liabilities Rolling Future Minimum Lease Payments |
Finance Leases |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
2024 |  | $ | 76.8 |  |  | $ | 8.3 |  |  | $ | — |  |  | $ | 9.9 |  |  | $ | 12.8 |  |  | $ | 5.8 |  |  | $ | 3.7 |  |  | $ | 12.6 |
2025 |  | 48.6 |  |  | 6.6 |  |  | — |  |  | 8.5 |  |  | 7.2 |  |  | 4.3 |  |  | 2.9 |  |  | 4.6 |
2026 |  | 33.0 |  |  | 5.1 |  |  | — |  |  | 3.5 |  |  | 4.5 |  |  | 3.1 |  |  | 2.5 |  |  | 3.9 |
2027 |  | 26.2 |  |  | 4.0 |  |  | — |  |  | 2.3 |  |  | 4.0 |  |  | 2.5 |  |  | 2.0 |  |  | 3.5 |
2028 |  | 19.2 |  |  | 2.8 |  |  | — |  |  | 1.9 |  |  | 3.3 |  |  | 2.0 |  |  | 1.7 |  |  | 3.0 |
After 2028 |  | 35.4 |  |  | 5.1 |  |  | — |  |  | 3.4 |  |  | 7.3 |  |  | 3.2 |  |  | 3.3 |  |  | 7.2 |
Total Future Minimum Lease Payments |  | 239.2 |  |  | 31.9 |  |  | — |  |  | 29.5 |  |  | 39.1 |  |  | 20.9 |  |  | 16.1 |  |  | 34.8 |
Less: Imputed Interest |  | 33.6 |  |  | 4.3 |  |  | — |  |  | 3.5 |  |  | 7.6 |  |  | 2.7 |  |  | 2.3 |  |  | 4.7 |
Estimated Present Value of Future Minimum Lease Payments |  | $ | 205.6 |  |  | $ | 27.6 |  |  | $ | — |  |  | $ | 26.0 |  |  | $ | 31.5 |  |  | $ | 18.2 |  |  | $ | 13.8 |  |  | $ | 30.1 |
Operating Lease Liabilities Rolling Future Minimum Lease Payments |
Operating Leases |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
2024 |  | $ | 141.6 |  |  | $ | 32.1 |  |  | $ | 1.4 |  |  | $ | 17.8 |  |  | $ | 18.9 |  |  | $ | 16.9 |  |  | $ | 12.2 |  |  | $ | 16.2 |
2025 |  | 103.3 |  |  | 15.7 |  |  | 0.7 |  |  | 14.8 |  |  | 10.6 |  |  | 15.3 |  |  | 11.1 |  |  | 15.0 |
2026 |  | 92.0 |  |  | 13.3 |  |  | 0.4 |  |  | 13.3 |  |  | 9.7 |  |  | 14.1 |  |  | 10.3 |  |  | 12.9 |
2027 |  | 82.6 |  |  | 10.7 |  |  | 0.2 |  |  | 12.1 |  |  | 8.9 |  |  | 12.8 |  |  | 9.3 |  |  | 11.5 |
2028 |  | 67.4 |  |  | 7.8 |  |  | 0.1 |  |  | 10.0 |  |  | 7.0 |  |  | 10.6 |  |  | 7.9 |  |  | 9.5 |
After 2028 |  | 327.6 |  |  | 8.1 |  |  | — |  |  | 16.8 |  |  | 4.8 |  |  | 9.1 |  |  | 129.1 |  |  | 135.6 |
Total Future Minimum Lease Payments |  | 814.5 |  |  | 87.7 |  |  | 2.8 |  |  | 84.8 |  |  | 59.9 |  |  | 78.8 |  |  | 179.9 |  |  | 200.7 |
Less: Imputed Interest |  | 179.4 |  |  | 8.1 |  |  | 0.1 |  |  | 10.4 |  |  | 5.4 |  |  | 8.6 |  |  | 63.0 |  |  | 69.2 |
Estimated Present Value of Future Minimum Lease Payments |  | $ | 635.1 |  |  | $ | 79.6 |  |  | $ | 2.7 |  |  | $ | 74.4 |  |  | $ | 54.5 |  |  | $ | 70.2 |  |  | $ | 116.9 |  |  | $ | 131.5 |
Maximum Potential Loss |
Company |  | Maximum Potential Loss
|  | (in millions)
AEP |  | $ | 45.3 |
AEP Texas |  | 10.9 |
APCo |  | 5.8 |
I&M |  | 4.1 |
OPCo |  | 7.2 |
PSO |  | 4.7 |
SWEPCo |  | 5.4 |

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