CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN MEMBER’S EQUITY - AEP Transmission Holdco - AEPTCo - USD ($) $ in Millions	Total	Paid-in Capital	Retained Earnings
Beginning balance at Dec. 31, 2023	$ 6,333.3	$ 3,043.4	$ 3,289.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contribution from Member	25.0	25.0
Dividends Paid to Member	(40.0)		(40.0)
Net Income	181.2		181.2
Ending balance at Mar. 31, 2024	6,499.5	3,068.4	3,431.1
Beginning balance at Dec. 31, 2024	6,950.9	3,100.6	3,850.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contribution from Member	32.5	32.5
Dividends Paid to Member	(42.5)		(42.5)
Net Income	211.5		211.5
Ending balance at Mar. 31, 2025	$ 7,152.4	$ 3,133.1	$ 4,019.3