CONSOLIDATED STATEMENTS OF CHANGES IN MEMBER’S EQUITY - AEP Transmission Holdco - USD ($) $ in Millions	Total	Paid-in Capital	Noncontrolling Interests	AEP TRANSMISSION COMPANY, LLC	AEP TRANSMISSION COMPANY, LLC Paid-in Capital	AEP TRANSMISSION COMPANY, LLC Retained Earnings	AEP TRANSMISSION COMPANY, LLC Noncontrolling Interests
Beginning balance at Dec. 31, 2022				$ 5,873.0	$ 3,022.0	$ 2,851.0	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contribution from AEP Member				30.0	30.0
Return of Capital to AEP Member				(8.0)	(8.0)
Dividends Paid to AEP Member				(175.0)		(175.0)
Dividends Paid to Noncontrolling Interest	$ (8.0)		$ (8.0)
Net Income				614.0		614.0
Ending balance at Dec. 31, 2023				6,334.0	3,044.0	3,290.0	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contribution from AEP Member				62.0	62.0
Return of Capital to AEP Member				(5.0)	(5.0)
Dividends Paid to AEP Member				(128.0)		(128.0)
Dividends Paid to Noncontrolling Interest	(6.0)		(6.0)
Net Income				688.0		688.0
Ending balance at Dec. 31, 2024				6,951.0	3,101.0	3,850.0	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contribution from AEP Member				70.0	70.0
Capital Contribution from Noncontrolling Interest	38.0		38.0	34.0			34.0
Dividends Paid to AEP Member				(3,274.0)		(3,274.0)
Dividends Paid to Noncontrolling Interest	(108.0)		(108.0)	(105.0)			(105.0)
Midwest Transmission Holdings Noncontrolling Interest Transaction	$ 2,783.0	$ 1,791.0	$ 992.0	2,783.0	1,791.0		992.0
Net Income				1,184.0		1,075.0	109.0
Ending balance at Dec. 31, 2025				$ 7,643.0	$ 4,962.0	$ 1,651.0	$ 1,030.0