CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - SWEPCo - USD ($) $ in Millions	Total	Common Stock	Paid-in Capital	Retained Earnings		Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	SWEPCo	SWEPCo Common Stock	SWEPCo Paid-in Capital	SWEPCo Retained Earnings	SWEPCo Accumulated Other Comprehensive Income (Loss)	SWEPCo Noncontrolling Interests
Beginning balance at Dec. 31, 2023	$ 25,285.9	$ 3,427.9	$ 9,073.9	$ 12,800.4		$ (55.5)	$ 39.2	$ 3,770.4	$ 0.1	$ 1,492.2	$ 2,281.3	$ (3.4)	$ 0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock Dividends	(466.9)			(465.5)	[1]		(1.4)	(50.0)			(50.0)
Common Stock Dividends – Nonaffiliated								(1.4)					(1.4)
Net Income (Loss)	1,005.7			1,003.1			2.6	209.6			208.1		1.5
Other Comprehensive Loss	(6.8)					(6.8)		(0.2)				(0.2)
Ending balance at Mar. 31, 2024	25,843.7	3,433.3	9,094.3	13,338.0		(62.3)	40.4	3,928.4	0.1	1,492.2	2,439.4	(3.6)	0.3
Beginning balance at Dec. 31, 2023	25,285.9	3,427.9	9,073.9	12,800.4		(55.5)	39.2	3,770.4	0.1	1,492.2	2,281.3	(3.4)	0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	2,309.9							280.6
Other Comprehensive Loss	(31.4)					(31.4)		(0.4)
Ending balance at Sep. 30, 2024	26,658.8	3,468.7	9,534.9	13,700.7		(86.9)	41.4	3,796.1	0.1	1,491.1	2,308.4	(3.8)	0.3
Beginning balance at Mar. 31, 2024	25,843.7	3,433.3	9,094.3	13,338.0		(62.3)	40.4	3,928.4	0.1	1,492.2	2,439.4	(3.6)	0.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock Dividends	(469.1)			(467.0)	[1]		(2.1)	(100.0)			(100.0)
Common Stock Dividends – Nonaffiliated								(1.0)					(1.0)
Net Income (Loss)	342.5			340.3			2.2	(69.1)			(70.1)		1.0
Other Comprehensive Loss	22.3					22.3
Ending balance at Jun. 30, 2024	26,175.7	3,465.4	9,498.5	13,211.3		(40.0)	40.5	3,758.3	0.1	1,492.2	2,269.3	(3.6)	0.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Return of Capital to Parent								(1.1)		(1.1)
Common Stock Dividends	(471.4)			(470.2)	[1]		(1.2)	(100.0)			(100.0)
Common Stock Dividends – Nonaffiliated								(1.0)					(1.0)
Net Income (Loss)	961.7			959.6			2.1	140.1			139.1		1.0
Other Comprehensive Loss	(46.9)					(46.9)		(0.2)				(0.2)
Ending balance at Sep. 30, 2024	26,658.8	3,468.7	9,534.9	13,700.7		(86.9)	41.4	3,796.1	0.1	1,491.1	2,308.4	(3.8)	0.3
Beginning balance at Dec. 31, 2024	26,986.1	3,471.6	9,606.1	13,869.2		(3.1)	42.3	3,905.0	0.1	1,549.7	2,352.5	2.3	0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock Dividends	(501.0)			(500.0)	[2]		(1.0)
Common Stock Dividends – Nonaffiliated								(1.0)					(1.0)
Net Income (Loss)	802.2			800.2			2.0	49.5			48.5		1.0
Other Comprehensive Loss	23.4					23.4		(0.1)				(0.1)
Ending balance at Mar. 31, 2025	27,364.0	3,478.7	9,652.3	14,169.4		20.3	43.3	3,953.4	0.1	1,549.7	2,401.0	2.2	0.4
Beginning balance at Dec. 31, 2024	26,986.1	3,471.6	9,606.1	13,869.2		(3.1)	42.3	3,905.0	0.1	1,549.7	2,352.5	2.3	0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	3,090.8							355.8
Other Comprehensive Loss	(24.7)					(24.7)		(0.2)
Ending balance at Sep. 30, 2025	31,479.3	3,486.0	11,561.8	15,369.3		(27.8)	1,090.0	4,708.3	0.1	2,000.3	2,705.8	2.1	0.0
Beginning balance at Mar. 31, 2025	27,364.0	3,478.7	9,652.3	14,169.4		20.3	43.3	3,953.4	0.1	1,549.7	2,401.0	2.2	0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contribution from Parent								450.6		450.6
Common Stock Dividends	(499.5)			(498.5)	[2]		(1.0)
Common Stock Dividends – Nonaffiliated								(1.0)					(1.0)
Net Income (Loss)	1,288.3			1,225.8			62.5	116.4			115.6		0.8
Other Comprehensive Loss	(32.9)					(32.9)
Ending balance at Jun. 30, 2025	30,968.4	3,482.4	11,504.6	14,896.7		(12.6)	1,097.3	4,519.4	0.1	2,000.3	2,516.6	2.2	0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock Dividends	(499.4)			(499.4)	[2]
Common Stock Dividends – Nonaffiliated	(69.5)						(69.5)	(0.9)					(0.9)
Net Income (Loss)	1,000.3			972.0			28.3	189.9			189.2		0.7
Other Comprehensive Loss	(15.2)					(15.2)		(0.1)				(0.1)
Ending balance at Sep. 30, 2025	$ 31,479.3	$ 3,486.0	$ 11,561.8	$ 15,369.3		$ (27.8)	$ 1,090.0	$ 4,708.3	$ 0.1	$ 2,000.3	$ 2,705.8	$ 2.1	$ 0.0

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

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