CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - AEP Transmission Holdco - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	$ 833.4	$ 787.1
Deferred Income Taxes	165.2	(113.3)
Allowance for Equity Funds Used During Construction	(57.3)	(43.6)
Property Taxes	(88.4)	(89.2)
Change in Other Noncurrent Assets	(130.9)	(74.5)
Change in Other Noncurrent Liabilities	141.5	61.8
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(1.5)	34.9
Materials and Supplies	138.6	104.3
Accounts Payable	6.2	(99.5)
Accrued Taxes, Net	(153.4)	(57.7)
Other Current Assets	(23.6)	(91.3)
Other Current Liabilities	(92.7)	(66.8)
Net Cash Flows from Operating Activities	1,450.0	1,442.2
INVESTING ACTIVITIES
Construction Expenditures	(2,100.2)	(1,761.7)
Other Investing Activities	50.2	29.6
Net Cash Flows Used for Investing Activities	(2,102.0)	(1,669.3)
FINANCING ACTIVITIES
Issuance of Long-term Debt	561.6	859.9
Retirement of Long-term Debt	(229.1)	(1,162.2)
Net Cash Flows from Financing Activities	698.0	129.9
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	46.0	(97.2)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	246.0	379.0
Cash, Cash Equivalents and Restricted Cash at End of Period	292.0	281.8
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	350.2	368.3
Net Cash Paid for Income Taxes	7.1	16.1
Construction Expenditures Included in Current Liabilities as of March 31,	1,040.9	837.0
AEPTCo
OPERATING ACTIVITIES
Net Income (Loss)	211.5	181.2
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	114.1	105.9
Deferred Income Taxes	33.3	25.0
Allowance for Equity Funds Used During Construction	(22.4)	(17.9)
Property Taxes	39.3	36.3
Change in Other Noncurrent Assets	(2.9)	(0.4)
Change in Other Noncurrent Liabilities	9.7	(6.1)
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(21.4)	(4.0)
Materials and Supplies	(0.2)	0.0
Accounts Payable	(1.4)	5.4
Accrued Taxes, Net	(75.3)	(63.2)
Other Current Assets	0.7	1.0
Other Current Liabilities	11.5	10.8
Net Cash Flows from Operating Activities	296.5	274.0
INVESTING ACTIVITIES
Construction Expenditures	(421.8)	(336.5)
Change in Advances to Affiliates, Net	(30.2)	(230.9)
Other Investing Activities	14.6	7.8
Net Cash Flows Used for Investing Activities	(437.4)	(559.6)
FINANCING ACTIVITIES
Capital Contribution from Member	32.5	25.0
Issuance of Long-term Debt	0.0	446.1
Change in Advances from Affiliates, Net	200.9	(145.5)
Retirement of Long-term Debt	(50.0)	0.0
Dividends Paid to Member	(42.5)	(40.0)
Net Cash Flows from Financing Activities	140.9	285.6
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	0.0	0.0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	0.0	0.0
Cash, Cash Equivalents and Restricted Cash at End of Period	0.0	0.0
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	32.8	33.3
Net Cash Paid for Income Taxes	0.1	0.0
Construction Expenditures Included in Current Liabilities as of March 31,	$ 229.9	$ 191.0