CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN COMMON SHAREHOLDER’S EQUITY - APCo - USD ($) $ in Millions	Total	Retained Earnings		Accumulated Other Comprehensive Income (Loss)	APCo	APCo Common Stock	APCo Paid-in Capital	APCo Retained Earnings	APCo Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2023					$ 5,276.7	$ 260.4	$ 1,834.5	$ 3,185.5	$ (3.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contribution from Parent					100.0		100.0
Common Stock Dividends	$ (466.9)	$ (465.5)	[1]
Net Income					136.5			136.5
Other Comprehensive Loss	(6.8)			$ (6.8)	(0.5)				(0.5)
Ending balance at Mar. 31, 2024					5,512.7	260.4	1,934.5	3,322.0	(4.2)
Beginning balance at Dec. 31, 2023					5,276.7	260.4	1,834.5	3,185.5	(3.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income					304.6
Other Comprehensive Loss	(31.4)			(31.4)	(1.4)
Ending balance at Sep. 30, 2024					5,609.9	260.4	1,939.5	3,415.1	(5.1)
Beginning balance at Mar. 31, 2024					5,512.7	260.4	1,934.5	3,322.0	(4.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contribution from Parent					9.5		9.5
Common Stock Dividends	(469.1)	(467.0)	[1]
Net Income					58.3			58.3
Other Comprehensive Loss	22.3			22.3	(0.5)				(0.5)
Ending balance at Jun. 30, 2024					5,580.0	260.4	1,944.0	3,380.3	(4.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Return of Capital to Parent					(4.5)		(4.5)
Common Stock Dividends	(471.4)	(470.2)	[1]		(75.0)			(75.0)
Net Income					109.8			109.8
Other Comprehensive Loss	(46.9)			(46.9)	(0.4)				(0.4)
Ending balance at Sep. 30, 2024					5,609.9	260.4	1,939.5	3,415.1	(5.1)
Beginning balance at Dec. 31, 2024	26,943.8				5,748.0	260.4	1,944.1	3,532.2	11.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock Dividends	(501.0)	(500.0)	[2]		(50.0)			(50.0)
Net Income					164.6			164.6
Other Comprehensive Loss	23.4			23.4	(0.3)				(0.3)
Ending balance at Mar. 31, 2025					5,862.3	260.4	1,944.1	3,646.8	11.0
Beginning balance at Dec. 31, 2024	26,943.8				5,748.0	260.4	1,944.1	3,532.2	11.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income					352.6
Other Comprehensive Loss	(24.7)			(24.7)	(0.9)
Ending balance at Sep. 30, 2025	30,389.3				6,058.2	260.4	1,952.6	3,834.8	10.4
Beginning balance at Mar. 31, 2025					5,862.3	260.4	1,944.1	3,646.8	11.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contribution from Parent					7.2		7.2
Common Stock Dividends	(499.5)	(498.5)	[2]
Net Income					106.9			106.9
Other Comprehensive Loss	(32.9)			(32.9)	(0.3)				(0.3)
Ending balance at Jun. 30, 2025					5,976.1	260.4	1,951.3	3,753.7	10.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contribution from Parent					1.3		1.3
Common Stock Dividends	(499.4)	$ (499.4)	[2]
Net Income					81.1			81.1
Other Comprehensive Loss	(15.2)			$ (15.2)	(0.3)				(0.3)
Ending balance at Sep. 30, 2025	$ 30,389.3				$ 6,058.2	$ 260.4	$ 1,952.6	$ 3,834.8	$ 10.4

[1] Cash dividends declared per AEP common share were $0.88.

[2] Cash dividends declared per AEP common share were $0.93.