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Acquisitions, Assets and Liabilities Held for Sale, Dispositions and Impairments (Tables) | 12 Months Ended
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Dec. 31, 2022
Lease Rental Costs |
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 |
Year Ended December 31, 2020 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Operating Lease Cost |  | $ | 279.6 |  |  | $ | 17.4 |  |  | $ | 2.6 |  |  | $ | 19.1 |  |  | $ | 101.5 |  |  | $ | 17.1 |  |  | $ | 7.8 |  |  | $ | 9.4 |
Finance Lease Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Right-of-Use Assets |  | 61.9 |  |  | 6.3 |  |  | — |  |  | 7.4 |  |  | 6.5 |  |  | 4.7 |  |  | 3.5 |  |  | 10.9 |
Interest on Lease Liabilities |  | 15.4 |  |  | 1.5 |  |  | — |  |  | 2.7 |  |  | 3.1 |  |  | 0.9 |  |  | 0.7 |  |  | 2.2 |
Total Lease Rental Costs (a) |  | $ | 356.9 |  |  | $ | 25.2 |  |  | $ | 2.6 |  |  | $ | 29.2 |  |  | $ | 111.1 |  |  | $ | 22.7 |  |  | $ | 12.0 |  |  | $ | 22.5 |
(a)Excludes variable and short-term lease costs, which were immaterial.
Lease cost NCWFs |
|  | PSO |  | SWEPCo
|  | December 31, 2022 |  | December 31, 2021 |  | December 31, 2022 |  | December 31, 2021
|  | (in millions)
Project |  |  |  |  |  |  |  |
Sundance |  | $ | 12.6 |  |  | $ | 12.6 |  |  | $ | 15.1 |  |  | $ | 15.1 |
Maverick |  | 18.0 |  |  | 18.0 |  |  | 21.6 |  |  | 21.6 |
Traverse |  | 39.8 |  |  | — |  |  | 47.7 |  |  | — |
Total |  | $ | 70.4 |  |  | $ | 30.6 |  |  | $ | 84.4 |  |  | $ | 36.7 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 + Details
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