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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - AEPTCO PARENT - CONDENSED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities: |  |  |
Change in Other Noncurrent Assets | $ (347.6) | $ (465.1) | $ (187.7)
Change in Other Noncurrent Liabilities | 306.3 | 29.0 | 337.8
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | (156.0) | 236.5 | (681.7)
Accounts Payable | 85.1 | (253.2) | 489.2
Other Current Liabilities | 182.6 | (161.4) | 54.3
Net Cash Flows from Operating Activities | 6,804.3 | 5,012.2 | 5,288.0
INVESTING ACTIVITIES |  |  |
Net Cash Flows Used for Investing Activities | (7,596.5) | (6,266.7) | (7,751.8)
FINANCING ACTIVITIES |  |  |
Issuance of Long-term Debt | 5,117.0 | 5,462.8 | 4,649.7
Retirement of Long-term Debt | (2,685.0) | (2,196.1) | (2,345.4)
Other Financing Activities | (49.8) | (78.6) | (105.4)
Net Cash Flows from Financing Activities | 659.2 | 1,077.0 | 2,568.9
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | (133.0) | (177.5) | 105.1
Cash, Cash Equivalents and Restricted Cash at Beginning of Period | 379.0 | 556.5 | 451.4
Cash, Cash Equivalents and Restricted Cash at End of Period | 246.0 | 379.0 | 556.5
AEP TRANSMISSION COMPANY, LLC |  |  |
OPERATING ACTIVITIES |  |  |
Net Income | 688.4 | 614.2 | 594.2
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities: |  |  |
Change in Other Noncurrent Assets | (0.6) | 8.6 | (7.4)
Change in Other Noncurrent Liabilities | (17.0) | 134.2 | 68.7
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | 13.4 | (41.3) | (46.3)
Accounts Payable | 9.5 | 22.8 | 18.5
Accrued Interest | 5.3 | 10.8 | 0.0
Other Current Liabilities | 13.3 | (0.1) | 3.0
Net Cash Flows from Operating Activities | 1,237.8 | 1,137.6 | 995.3
INVESTING ACTIVITIES |  |  |
Change in Advances to Affiliates, Net | 36.7 | (62.7) | 22.8
Net Cash Flows Used for Investing Activities | (1,428.1) | (1,557.7) | (1,439.2)
FINANCING ACTIVITIES |  |  |
Capital Contribution from Member | 61.7 | 29.7 | 72.7
Return of Capital to Parent | (4.5) | (8.6) | 0.0
Issuance of Long-term Debt | 445.7 | 689.0 | 540.8
Retirement of Long-term Debt | (95.0) | (60.0) | (104.0)
Change in Advances from Affiliates, Net | (89.6) | (55.0) | 104.4
Dividends Paid to Member | (128.0) | (175.0) | (170.0)
Net Cash Flows from Financing Activities | 190.3 | 420.1 | 443.9
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | 0.0 | 0.0 | 0.0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period | 0.0 | 0.0 | 0.0
Cash, Cash Equivalents and Restricted Cash at End of Period | 0.0 | 0.0 | 0.0
Parent Company |  |  |
OPERATING ACTIVITIES |  |  |
Net Income | 2,967.1 | 2,208.1 | 2,307.2
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities: |  |  |
Equity Earnings of Unconsolidated Subsidiaries | (3,280.2) | (2,468.2) | (2,809.6)
Change in Other Noncurrent Assets | 4.9 | (28.4) | (5.0)
Change in Other Noncurrent Liabilities | 70.8 | 92.3 | 83.5
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | 17.9 | 28.7 | (61.0)
Accounts Payable | (16.5) | (15.9) | 1.1
Other Current Liabilities | 55.3 | (14.5) | (76.6)
Net Cash Flows from Operating Activities | 888.6 | 528.5 | 337.9
INVESTING ACTIVITIES |  |  |
Change in Advances to Affiliates, Net | 59.9 | 2,007.6 | (1,411.3)
Repayment of Notes Receivable from Affiliated Companies | (190.0) | 0.0 | 0.0
Issuance of Notes Receivable to Affiliated Companies | 0.0 | 210.0 | 20.0
Net Cash Flows Used for Investing Activities | 748.3 | 1,063.5 | (1,976.0)
FINANCING ACTIVITIES |  |  |
Issuance of Long-term Debt | 1,285.4 | 1,829.8 | 986.6
Retirement of Long-term Debt | (1,104.0) | (1,050.0) | (300.0)
Change in Advances from Affiliates, Net | (221.7) | (191.6) | 336.9
Other Financing Activities | (41.1) | (59.6) | (74.5)
Net Cash Flows from Financing Activities | (1,747.2) | (1,648.4) | 1,645.0
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | (110.3) | (56.4) | 6.9
Cash, Cash Equivalents and Restricted Cash at Beginning of Period | 197.8 | 254.2 | 247.3
Cash, Cash Equivalents and Restricted Cash at End of Period | 87.5 | 197.8 | 254.2
Parent Company | AEP TRANSMISSION COMPANY, LLC |  |  |
OPERATING ACTIVITIES |  |  |
Net Income | 688.4 | 614.2 | 594.2
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities: |  |  |
Equity Earnings of Unconsolidated Subsidiaries | (687.8) | (612.9) | (594.2)
Change in Other Noncurrent Assets | 0.0 | 3.8 | 0.0
Change in Other Noncurrent Liabilities | 4.0 | 11.5 | 9.1
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | 10.4 | (37.5) | (2.2)
Accounts Payable | 12.9 | 36.6 | (0.6)
Accrued Interest | 5.4 | 10.8 | 0.0
Other Current Liabilities | 34.0 | (30.5) | (0.8)
Net Cash Flows from Operating Activities | 67.3 | (4.0) | 5.5
INVESTING ACTIVITIES |  |  |
Change in Advances to Affiliates, Net | (20.4) | 0.0 | 12.7
Repayment of Notes Receivable from Affiliated Companies | 95.0 | 60.0 | 104.0
Issuance of Notes Receivable to Affiliated Companies | 450.0 | 700.0 | 550.0
Return of Capital Contributions from Unconsolidated Subsidiaries | 132.8 | 183.7 | 130.0
Capital Contributions to Subsidiaries | (61.7) | (29.7) | (69.5)
Net Cash Flows Used for Investing Activities | (304.3) | (486.0) | (372.8)
FINANCING ACTIVITIES |  |  |
Capital Contribution from Member | 61.7 | 29.7 | 72.7
Return of Capital to Parent | (4.5) | (8.6) | 0.0
Issuance of Long-term Debt | 445.7 | 689.0 | 540.8
Retirement of Long-term Debt | (95.0) | (60.0) | (104.0)
Change in Advances from Affiliates, Net | (42.7) | 14.9 | 27.8
Dividends Paid to Member | (128.0) | (175.0) | (170.0)
Other Financing Activities | (0.2) | 0.0 | 0.0
Net Cash Flows from Financing Activities | 237.0 | 490.0 | 367.3
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | 0.0 | 0.0 | 0.0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period | 0.0 | 0.0 | 0.0
Cash, Cash Equivalents and Restricted Cash at End of Period | $ 0.0 | $ 0.0 | $ 0.0

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