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BUSINESS SEGMENTS - Schedule of AEPTCo's Reportable Segment Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Total Revenues | $ 19,721.3 | $ 18,982.3 | $ 19,639.5
Other Operation and Maintenance | 4,452.7 | 4,086.8 | 4,127.5
Depreciation and Amortization | 3,289.9 | 3,090.4 | 3,202.8
Taxes Other Than Income Taxes | 1,596.3 | 1,492.3 | 1,469.8
Allowance for equity funds used during construction | 211.0 | 174.9 | 133.7
Interest Expense | 1,862.8 | 1,806.9 | 1,396.1
Income Tax Expense (Benefit) | (39.2) | 54.6 | 5.4
Gross Property Additions | 8,030.2 | 7,533.5 | 7,879.0
Total Assets | 103,078.0 | 96,684.0 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 21,500.5 | 20,523.5 | 21,133.4
Other Operation and Maintenance | 5,986.8 | 5,433.4 | 5,435.8
Depreciation and Amortization | 3,310.7 | 3,106.4 | 3,201.9
Taxes Other Than Income Taxes | 1,576.4 | 1,477.2 | 1,453.5
Allowance for equity funds used during construction | 211.0 | 174.9 | 133.7
Interest Expense | 1,368.7 | 1,406.7 | 1,200.0
Income Tax Expense (Benefit) | 112.9 | 138.1 | 133.6
Gross Property Additions | 7,594.7 | 7,495.5 | 7,881.9
Total Assets | 101,506.6 | 95,814.6 |
Operating Segments | Nonrelated Party |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 19,663.3 | 18,921.6 | 19,588.8
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 183.1 | 168.0 | 109.9
Other Operation and Maintenance | 136.3 | 103.1 | 130.0
Depreciation and Amortization | (20.8) | (16.0) | 0.9
Taxes Other Than Income Taxes | 0.4 | 0.2 | 0.2
Allowance for equity funds used during construction | 0.0 | 0.0 | 0.0
Interest Expense | 612.5 | 594.7 | 308.9
Income Tax Expense (Benefit) | (152.1) | (83.5) | (128.2)
Gross Property Additions | 466.6 | 36.6 | 25.9
Total Assets | 5,550.8 | 5,194.0 |
Corporate and Other | Nonrelated Party |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 58.0 | 60.7 | 50.7
Reconciling Adjustments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | (1,962.3) | (1,709.2) | (1,603.8)
Other Operation and Maintenance | (1,670.4) | (1,449.7) | (1,438.3)
Depreciation and Amortization | 0.0 | 0.0 | 0.0
Taxes Other Than Income Taxes | 19.5 | 14.9 | 16.1
Allowance for equity funds used during construction | 0.0 | 0.0 | 0.0
Interest Expense | (118.4) | (194.5) | (112.8)
Income Tax Expense (Benefit) | 0.0 | 0.0 | 0.0
Gross Property Additions | (31.1) | 1.4 | (28.8)
Total Assets | (3,979.4) | (4,324.6) |
Reconciling Adjustments | Nonrelated Party |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0.0 | 0.0 | 0.0
AEP TRANSMISSION COMPANY, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 1,890.9 | 1,672.0 | 1,624.5
Other Revenues |  |  | (0.2)
Other Operation and Maintenance | 158.3 | 129.4 | 153.5
Depreciation and Amortization | 430.9 | 393.8 | 346.2
Taxes Other Than Income Taxes | 308.7 | 283.2 | 271.1
Interest Income | 10.5 | 7.0 | 1.6
Allowance for equity funds used during construction | 89.4 | 83.2 | 70.7
Interest Expense | 214.2 | 194.5 | 162.7
Income Tax Expense (Benefit) | 190.3 | 147.1 | 169.1
NET INCOME | 688.4 | 614.2 | 594.2
Gross Property Additions | 1,481.8 | 1,503.1 | 1,468.3
Total Assets | 16,370.3 | 15,072.5 |
AEP TRANSMISSION COMPANY, LLC | Nonrelated Party |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 378.6 | 354.2 | 340.9
AEP TRANSMISSION COMPANY, LLC | Affiliated Entity |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 1,512.3 | 1,317.8 | 1,283.8
AEP TRANSMISSION COMPANY, LLC | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 1,890.9 | 1,672.0 | 1,624.5
Other Operation and Maintenance | 156.6 | 129.2 | 152.8
Taxes Other Than Income Taxes | 308.7 | 283.2 | 271.1
AEP TRANSMISSION COMPANY, LLC | Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0.0 | 0.0 | 0.0
Other Revenues |  |  | 0.0
Other Operation and Maintenance | 1.7 | 0.2 | 0.7
Depreciation and Amortization | 0.0 | 0.0 | 0.0
Taxes Other Than Income Taxes | 0.0 | 0.0 | 0.0
Interest Income | 241.1 | 218.0 | 177.8
Allowance for equity funds used during construction | 0.0 | 0.0 | 0.0
Interest Expense | 238.7 | 215.1 | 177.1
Income Tax Expense (Benefit) | 0.1 | 1.4 | 0.0
NET INCOME | 0.6 | 1.3 | 0.0
Gross Property Additions | 0.0 | 0.0 | 0.0
Total Assets | 8,670.4 | 5,486.6 |
AEP TRANSMISSION COMPANY, LLC | Corporate and Other | Nonrelated Party |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0.0 | 0.0 | 0.0
AEP TRANSMISSION COMPANY, LLC | Corporate and Other | Affiliated Entity |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0.0 | 0.0 | 0.0
AEP TRANSMISSION COMPANY, LLC | Reconciling Adjustments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0.0 | 0.0 | 0.0
Other Revenues |  |  | 0.0
Other Operation and Maintenance | 0.0 | 0.0 | 0.0
Depreciation and Amortization | 0.0 | 0.0 | 0.0
Taxes Other Than Income Taxes | 0.0 | 0.0 | 0.0
Interest Income | (238.5) | (214.8) | (176.9)
Allowance for equity funds used during construction | 0.0 | 0.0 | 0.0
Interest Expense | (238.5) | (214.8) | (176.9)
Income Tax Expense (Benefit) | 0.0 | 0.0 | 0.0
NET INCOME | 0.0 | 0.0 | 0.0
Gross Property Additions | 0.0 | 0.0 | 0.0
Total Assets | (9,187.8) | (5,534.7) |
AEP TRANSMISSION COMPANY, LLC | Reconciling Adjustments | Nonrelated Party |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0.0 | 0.0 | 0.0
AEP TRANSMISSION COMPANY, LLC | Reconciling Adjustments | Affiliated Entity |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0.0 | 0.0 | 0.0
State Transcos | AEP TRANSMISSION COMPANY, LLC | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Other Revenues |  |  | (0.2)
Depreciation and Amortization | 430.9 | 393.8 | 346.2
Interest Income | 7.9 | 3.8 | 0.7
Allowance for equity funds used during construction | 89.4 | 83.2 | 70.7
Interest Expense | 214.0 | 194.2 | 162.5
Income Tax Expense (Benefit) | 190.2 | 145.7 | 169.1
NET INCOME | 687.8 | 612.9 | 594.2
Gross Property Additions | 1,481.8 | 1,503.1 | 1,468.3
Total Assets | 16,887.7 | 15,120.6 |
State Transcos | AEP TRANSMISSION COMPANY, LLC | Operating Segments | Nonrelated Party |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 378.6 | 354.2 | 340.9
State Transcos | AEP TRANSMISSION COMPANY, LLC | Operating Segments | Affiliated Entity |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | $ 1,512.3 | $ 1,317.8 | $ 1,283.8

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