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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Depreciation and Amortization (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Depreciation and Amortization of Property, Plant and Equipment | $ 3,148.6 | $ 2,927.5 | $ 3,072.8
Amortization of Certain Securitized Assets | 91.3 | 91.9 | 93.3
Amortization of Regulatory Assets and Liabilities | 50.0 | 71.0 | 36.7
Depreciation and Amortization | 3,289.9 | 3,090.4 | 3,202.8
AEP Texas |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 405.9 | 380.0 | 363.5
Amortization of Certain Securitized Assets | 91.3 | 91.9 | 93.3
Amortization of Regulatory Assets and Liabilities | (3.7) | (3.4) | (4.4)
Depreciation and Amortization | 493.5 | 468.5 | 452.4
AEPTCo |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 430.9 | 393.8 | 346.2
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0
Amortization of Regulatory Assets and Liabilities | 0.0 | 0.0 | 0.0
Depreciation and Amortization | 430.9 | 393.8 | 346.2
APCo |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 600.4 | 571.1 | 576.1
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0
Amortization of Regulatory Assets and Liabilities | 2.0 | 0.8 | (0.2)
Depreciation and Amortization | 602.4 | 571.9 | 575.9
I&M |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 456.2 | 439.8 | 511.9
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0
Amortization of Regulatory Assets and Liabilities | 24.9 | 30.2 | 15.3
Depreciation and Amortization | 481.1 | 470.0 | 527.2
OPCo |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 386.0 | 315.8 | 293.1
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0
Amortization of Regulatory Assets and Liabilities | 0.0 | 0.4 | 1.2
Depreciation and Amortization | 386.0 | 316.2 | 294.3
PSO |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 263.1 | 240.3 | 226.2
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0
Amortization of Regulatory Assets and Liabilities | 9.1 | 15.2 | 3.9
Depreciation and Amortization | 272.2 | 255.5 | 230.1
SWEPCo |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 375.4 | 323.4 | 319.3
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0
Amortization of Regulatory Assets and Liabilities | 13.9 | 19.4 | 5.5
Depreciation and Amortization | $ 389.3 | $ 342.8 | $ 324.8

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