Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Vertically Integrated Utilities [Member]	Transmission and Distribution Utilities [Member]	Generation and Marketing Revenues [Member]	Other Revenues [Member]		Reconciling Adjustments [Member]	Reconciling Adjustments [Member] Other Revenues [Member]		Generation And Marketing [Member]	Generation And Marketing [Member] Generation and Marketing Revenues [Member]	Generation And Marketing [Member] Other Revenues [Member]		Other Segments [Member]	[2]	Other Segments [Member] Other Revenues [Member]		Transmission Operations [Member]	Transmission Operations [Member] Transmission [Member]	Transmission And Distribution Utilities [Member]	Transmission And Distribution Utilities [Member] Transmission and Distribution Utilities [Member]	Transmission And Distribution Utilities [Member] Other Revenues [Member]		Vertically Integrated Utilities [Member]	Vertically Integrated Utilities [Member] Vertically Integrated Utilities [Member]	Vertically Integrated Utilities [Member] Other Revenues [Member]		Appalachian Power Co [Member]	Appalachian Power Co [Member] Vertically Integrated Utilities [Member]	Appalachian Power Co [Member] Other Revenues [Member]		AEP Texas Inc. [Member]	AEP Texas Inc. [Member] Transmission and Distribution Utilities [Member]	AEP Texas Inc. [Member] Other Revenues [Member]		AEP Transmission Co [Member]	AEP Transmission Co [Member] Transmission [Member]	AEP Transmission Co [Member] Other Revenues [Member]		AEP Transmission Co [Member] Reconciling Adjustments [Member]	AEP Transmission Co [Member] Reconciling Adjustments [Member] Other Revenues [Member]	AEP Transmission Co [Member] State Transcos [Member]	AEP Transmission Co [Member] State Transcos [Member] Transmission [Member]	AEP Transmission Co [Member] State Transcos [Member] Other Revenues [Member]	AEP Transmission Co [Member] AEPTCo Parent [Member]		AEP Transmission Co [Member] AEPTCo Parent [Member] Other Revenues [Member]	Indiana Michigan Power Co [Member]	Indiana Michigan Power Co [Member] Vertically Integrated Utilities [Member]	Indiana Michigan Power Co [Member] Other Revenues [Member]		Ohio Power Co [Member]	Ohio Power Co [Member] Transmission and Distribution Utilities [Member]	Ohio Power Co [Member] Other Revenues [Member]		Public Service Co Of Oklahoma [Member]	Public Service Co Of Oklahoma [Member] Vertically Integrated Utilities [Member]	Public Service Co Of Oklahoma [Member] Other Revenues [Member]		Southwestern Electric Power Co [Member]	Southwestern Electric Power Co [Member] Vertically Integrated Utilities [Member]	Southwestern Electric Power Co [Member] Other Revenues [Member]		Common Stock [Member]	Common Stock [Member] Appalachian Power Co [Member]	Common Stock [Member] Indiana Michigan Power Co [Member]	Common Stock [Member] Ohio Power Co [Member]	Common Stock [Member] Public Service Co Of Oklahoma [Member]	Common Stock [Member] Southwestern Electric Power Co [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Appalachian Power Co [Member]	Additional Paid-in Capital [Member] AEP Texas Inc. [Member]	Additional Paid-in Capital [Member] AEP Transmission Co [Member]	Additional Paid-in Capital [Member] Indiana Michigan Power Co [Member]	Additional Paid-in Capital [Member] Ohio Power Co [Member]	Additional Paid-in Capital [Member] Public Service Co Of Oklahoma [Member]	Additional Paid-in Capital [Member] Southwestern Electric Power Co [Member]	Retained Earnings [Member]		Retained Earnings [Member] Appalachian Power Co [Member]	Retained Earnings [Member] AEP Texas Inc. [Member]	Retained Earnings [Member] AEP Transmission Co [Member]	Retained Earnings [Member] Indiana Michigan Power Co [Member]	Retained Earnings [Member] Ohio Power Co [Member]	Retained Earnings [Member] Public Service Co Of Oklahoma [Member]	Retained Earnings [Member] Southwestern Electric Power Co [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Appalachian Power Co [Member]	Accumulated Other Comprehensive Income (Loss) [Member] AEP Texas Inc. [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Indiana Michigan Power Co [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Public Service Co Of Oklahoma [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Southwestern Electric Power Co [Member]	Noncontrolling Interests [Member]	Noncontrolling Interests [Member] Southwestern Electric Power Co [Member]
Beginning Balance at Dec. 31, 2022																																				$ 5,873.0																																					$ 3,022.3									$ 2,850.7
Beginning Balance at Dec. 31, 2022	$ 24,122.4																											$ 4,975.4				$ 3,904.3																$ 3,008.3				$ 3,088.1				$ 2,419.1				$ 3,674.8				$ 3,413.1	$ 260.4	$ 56.6	$ 321.2	$ 157.2	$ 0.1	$ 8,051.0	$ 1,828.7	$ 1,558.2		$ 988.8	$ 837.8	$ 1,042.6	$ 1,442.2	$ 12,345.6		$ 2,891.1	$ 2,354.7		$ 1,963.2	$ 1,929.1	$ 1,218.0	$ 2,236.0	$ 83.7	$ (4.8)	$ (8.6)	$ (0.3)	$ 1.3	$ (4.2)	$ 229.0	$ 0.7
Beginning Balance, Shares at Dec. 31, 2022																																																																525,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Value	41.1																																																															$ 5.1						36.0
Issuance of Common Stock, Shares																																																																800,000
Common Stock Dividends	(431.8)																																																																													(428.8)	[1]
Common Stock Dividends																																																(31.2)								(17.5)																											(31.2)		(17.5)
Common Stock Dividends																																																												(1.5)																																	(3.0)	(1.5)
Other Changes in Equity	(12.5)																																																																					(12.7)																							0.2
Capital Contribution from Member																																100.0				25.0																50.0								50.0												100.0	25.0		50.0		50.0
Dividends Paid on Common Stock																																				(55.0)												(31.2)								(17.5)				0.0																						(55.0)
Net Income (Loss)	397.0																																																											40.6																		397.0								40.6
Net Income (Loss) Attributable to Noncontrolling Interests	3.4																																																											1.2																																	3.4	1.2
Net Income (Loss)	400.4						$ 0.0			$ (156.4)				$ (13.5)				$ 182.4		$ 125.7				$ 262.2				112.5				47.6				162.7				$ 0.0		$ 161.6			$ 1.1	[3]		102.8				78.0				(2.3)				41.8																				112.5	47.6	162.7	102.8	78.0	(2.3)
Other Comprehensive Income (Loss)	(151.8)																											(1.0)				(0.6)																(2.6)								(1.5)				0.1																											(151.8)	(1.0)	(0.6)	(2.6)	(1.5)	0.1
Ending Balance at Mar. 31, 2023																																				6,005.7																																					3,047.3									2,958.4
Ending Balance at Mar. 31, 2023	$ 23,967.8																											5,086.9				4,051.3																3,077.3				3,216.1				2,397.8				3,765.2				$ 3,418.2	260.4	56.6	321.2	157.2	0.1	8,074.3	1,828.7	1,658.2		988.8	887.8	1,042.6	1,492.2	12,313.8		3,003.6	2,402.3		2,034.8	2,007.1	1,198.2	2,276.6	(68.1)	(5.8)	(9.2)	(2.9)	(0.2)	(4.1)	229.6	0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contributions from Parent																												0.0				100.0				25.0																50.0								50.0
Ending Balance, Shares at Mar. 31, 2023																																																																525,900,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends Per Share, Declared	$ 0.83
Revenue from Contracts with Customers	$ 4,690.9	$ 2,816.3	$ 1,455.3	$ 326.9	$ 92.4		0.0				$ 326.9					$ 2.3	[2]		$ 90.1		$ 1,455.3				$ 2,816.3				$ 914.5	$ 3.6			$ 427.7	$ 0.6			$ 90.0	$ 0.0		0.0			$ 89.0		0.0				$ 642.8	$ 3.1			$ 1,021.8	$ 5.2			$ 414.8	$ 1.5			$ 503.7	$ 0.5
Revenues	4,690.9				(129.9)	[4],[5]	(443.7)	$ (0.9)	[4],[5]	327.0		$ (141.0)	[4],[5]	30.1		1.0	[4],[5]	455.5		1,464.2		$ 11.1	[4],[5]	2,857.8		$ (0.1)	[4],[5]	987.7		0.0	[6]	429.5		0.0	[6]	441.6		0.0	[6]	0.0		441.6			0.0			663.0		0.0	[6]	1,034.6		11.1	[6]	417.0		0.0	[6]	515.9		0.0	[6]
Revenues from Related Parties, Net of Provisions for Refund																																				352.6
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax																																					89.0
Beginning Balance at Dec. 31, 2023																																				6,333.3																																					3,043.4									3,289.9
Beginning Balance at Dec. 31, 2023	$ 25,285.9																											5,276.7				4,796.1																3,140.2				3,571.3				$ 2,570.6				3,770.4				$ 3,427.9	260.4	56.6	321.2	157.2	0.1	9,073.9	1,834.5	2,079.6		997.6	1,012.8	1,039.3	1,492.2	12,800.4		3,185.5	2,725.1		2,086.6	2,237.3	1,374.3	2,281.3	(55.5)	(3.7)	(8.6)	(0.6)	(0.2)	(3.4)	39.2	0.2
Beginning Balance, Shares at Dec. 31, 2023	527,369,157																																																							10,482,000								527,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Value	$ 40.6																																																															$ 5.4						35.2
Issuance of Common Stock, Shares																																																																800,000
Common Stock Dividends	(466.9)																																																																													(465.5)	[7]
Common Stock Dividends																																																(37.5)								$ (35.0)				(50.0)																							(37.5)		(35.0)	(50.0)
Common Stock Dividends																																																												(1.4)																																	(1.4)	(1.4)
Other Changes in Equity	(14.8)																																																																					(14.8)
Capital Contribution from Member																																				25.0																																					25.0
Dividends Paid on Common Stock																																				(40.0)												(37.5)								(35.0)				(50.0)																						(40.0)
Net Income (Loss)	1,003.1																																																											208.1																		1,003.1								208.1
Net Income (Loss) Attributable to Noncontrolling Interests	2.6																																																											1.5																																	2.6	1.5
Net Income (Loss)	1,005.7						0.0			137.6				(54.3)				209.8		150.3				562.3				136.5				79.7				181.2				0.0		181.7			(0.5)	[3]		145.0				70.6				72.0				209.6																				136.5	79.7	181.2	145.0	70.6	72.0
Other Comprehensive Income (Loss)	(6.8)																											(0.5)				3.9																0.1												(0.2)																											(6.8)	(0.5)	3.9	0.1		(0.2)
Ending Balance at Mar. 31, 2024																																				6,499.5																																					$ 3,068.4									$ 3,431.1
Ending Balance at Mar. 31, 2024	$ 25,843.7																											5,512.7				4,879.7																3,247.8				3,641.9				$ 2,607.6				3,928.4				$ 3,433.3	$ 260.4	$ 56.6	$ 321.2	$ 157.2	$ 0.1	$ 9,094.3	1,934.5	$ 2,079.6		$ 997.6	$ 1,012.8	$ 1,039.3	$ 1,492.2	$ 13,338.0		$ 3,322.0	$ 2,804.8		$ 2,194.1	$ 2,307.9	$ 1,411.3	$ 2,439.4	$ (62.3)	$ (4.2)	$ (4.7)	$ (0.5)	$ (0.2)	$ (3.6)	$ 40.4	$ 0.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contributions from Parent																												100.0				0.0				25.0																0.0								0.0											$ 100.0
Ending Balance, Shares at Mar. 31, 2024	528,199,306																																																							10,482,000								528,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends Per Share, Declared	$ 0.88
Revenue from Contracts with Customers	$ 5,025.7	$ 2,901.2	$ 1,483.2	$ 515.9	125.4		0.0				$ 515.9					14.9	[2]		$ 110.5		$ 1,483.2				$ 2,901.2				$ 1,024.3	5.6			$ 463.0	2.1			98.4	2.4		0.0	$ 0.0		$ 97.0	$ 2.4	0.0		$ 0.0		$ 647.8	2.8			$ 1,015.4	2.7			$ 378.1	6.2			$ 500.2	3.9
Revenues	$ 5,025.7				$ (60.8)	[8],[9]	$ (526.0)	$ 8.0	[8],[9]	$ 563.5		$ (42.9)	[8],[9]	$ 52.8		$ (8.1)	[8],[9]	$ 497.3		$ 1,490.2		$ 7.9	[8],[9]	$ 2,947.9		$ (25.7)	[8],[9]	$ 1,093.0		$ 0.1	[10]	$ 466.4		$ 0.0	[10]	482.8		0.0	[10]	$ 0.0		$ 482.8			$ 0.0			$ 667.4		$ (25.9)	[10]	$ 1,023.8		$ 7.9	[10]	$ 387.8		$ 0.0	[10]	$ 516.2		$ 0.0	[10]
Revenues from Related Parties, Net of Provisions for Refund																																				$ 383.4
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax																																					$ 97.0	$ 2.4

[1] Cash dividends declared per AEP common share were $0.83.

[2] Corporate and Other primarily includes the purchasing of receivables from certain AEP utility subsidiaries. This segment also includes Parent’s guarantee revenue received from affiliates, investment income, interest income, interest expense and other nonallocated costs.

[3] Includes the elimination of AEPTCo Parent’s equity earnings in the State Transcos.

[4] Generation & Marketing includes economic hedge activity.

[5] Amounts include affiliated and nonaffiliated revenues

[6] Amounts include affiliated and nonaffiliated revenues.

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

[8] Amounts include affiliated and nonaffiliated revenues.

[9] Generation & Marketing includes economic hedge activity.

[10] Amounts include affiliated and nonaffiliated revenues.