CONSOLIDATED STATEMENTS OF CASH FLOWS - AEP Transmission Holdco - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	$ 3,289.9	$ 3,090.4	$ 3,202.8
Deferred Income Taxes	58.3	185.1	(137.2)
Allowance for Equity Funds Used During Construction	(211.0)	(174.9)	(133.7)
Property Taxes	(45.4)	(41.1)	(41.2)
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)
Materials and Supplies	171.6	(504.0)	(313.9)
Accounts Payable	85.1	(253.2)	489.2
Accrued Taxes, Net	240.2	22.5	105.4
Other Current Assets	(13.2)	(43.9)	109.0
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
Construction Expenditures	(7,630.7)	(7,378.3)	(6,671.7)
Other Investing Activities	141.9	122.1	50.3
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)
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
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	1,837.8	1,673.5	1,286.3
Net Cash Paid for Income Taxes	133.4	78.4	116.8
Construction Expenditures Included in Current Liabilities as of December 31,	1,312.0	842.4	1,258.9
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:
Depreciation and Amortization	430.9	393.8	346.2
Deferred Income Taxes	109.6	44.1	62.3
Allowance for Equity Funds Used During Construction	(89.4)	(83.2)	(70.7)
Property Taxes	(22.5)	(19.8)	(20.9)
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)
Materials and Supplies	0.0	10.7	(1.4)
Accounts Payable	9.5	22.8	18.5
Accrued Taxes, Net	97.3	42.9	50.2
Accrued Interest	5.3	10.8	0.0
Other Current Assets	(0.4)	(0.1)	(1.1)
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
Construction Expenditures	(1,477.3)	(1,496.2)	(1,458.5)
Change in Advances to Affiliates, Net	36.7	(62.7)	22.8
Acquisitions of Assets	(4.5)	(6.9)	(9.8)
Other Investing Activities	17.0	8.1	6.3
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
Change in Advances from Affiliates, Net	(89.6)	(55.0)	104.4
Retirement of Long-term Debt	(95.0)	(60.0)	(104.0)
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
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	204.0	179.9	158.8
Net Cash Paid for Income Taxes	42.6	87.6	95.5
Construction Expenditures Included in Current Liabilities as of December 31,	$ 262.7	$ 177.6	$ 320.7