Condensed Consolidated Statements of Changes in Equity - USD ($)	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] State Transcos [Member]	AEP Transmission Co [Member] State Transcos [Member] Transmission [Member]	AEP Transmission Co [Member] AEPTCo Parent [Member]		Indiana Michigan Power Co [Member]	Indiana Michigan Power Co [Member] Related Party	Indiana Michigan Power Co [Member] Vertically Integrated Utilities [Member]	Indiana Michigan Power Co [Member] Other Revenues [Member]		Indiana Michigan Power Co [Member] Other Revenues [Member] Related Party	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] Related Party	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 [Member]	Accumulated Other Comprehensive Income [Member] Appalachian Power Co [Member]	Accumulated Other Comprehensive Income [Member] AEP Texas Inc. [Member]	Accumulated Other Comprehensive Income [Member] Indiana Michigan Power Co [Member]	Accumulated Other Comprehensive Income [Member] Public Service Co Of Oklahoma [Member]	Accumulated Other Comprehensive Income [Member] Southwestern Electric Power Co [Member]	Noncontrolling Interests [Member]	Noncontrolling Interests [Member] Southwestern Electric Power Co [Member]
Beginning Balance at Dec. 31, 2021																																				$ 5,376,100,000																																					$ 2,949,600,000									$ 2,426,500,000
Beginning Balance at Dec. 31, 2021	$ 22,680,200,000																											$ 4,647,900,000				$ 3,594,200,000													$ 2,784,700,000						$ 2,846,300,000				$ 2,291,600,000				$ 3,149,800,000					$ 3,408,700,000	$ 260,400,000	$ 56,600,000	$ 321,200,000	$ 157,200,000	$ 100,000	$ 7,172,600,000	$ 1,828,700,000	$ 1,553,900,000		$ 980,900,000	$ 838,800,000	$ 1,039,000,000	$ 1,092,200,000	$ 11,667,100,000		$ 2,534,400,000	$ 2,046,800,000		$ 1,748,500,000	$ 1,686,300,000	$ 1,095,400,000	$ 2,050,900,000	$ 184,800,000	$ 24,400,000	$ (6,500,000)	$ (1,300,000)	$ 0	$ 6,700,000	$ 247,000,000.0	$ (100,000)
Beginning Balance, Shares at Dec. 31, 2021																																																																524,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Value	809,500,000																																																															$ 2,400,000						807,100,000
Issuance of Common Stock, Shares																																																																400,000
Common Stock Dividends	(398,800,000)																																																																													(395,200,000)	[1]
Common Stock Dividends																												(18,800,000)																	(25,000,000.0)						(15,000,000.0)																													(18,800,000)			(25,000,000.0)	(15,000,000.0)
Common Stock Dividends																																																											(800,000)																																		(3,600,000)	(800,000)
Other Changes in Equity	(16,700,000)																																																																					(15,200,000)								(1,500,000)
Capital Contribution from Member																																																											350,000,000.0																		350,000,000.0
Dividends Paid on Common Stock																																				(40,000,000.0)																																														(40,000,000.0)
Net Income (Loss)																																																																														714,700,000								44,100,000
Net Income (Loss) Attributable to Noncontrolling Interests																																																																																													3,400,000	1,000,000.0
Net Income (Loss)	718,100,000																											120,200,000				69,600,000				155,400,000									89,500,000						83,200,000				5,800,000				45,100,000																					120,200,000	69,600,000	155,400,000	89,500,000	83,200,000	5,800,000
Other Comprehensive Income (Loss)	245,800,000																											(1,300,000)				300,000													300,000														(300,000)																												245,800,000	(1,300,000)	300,000	300,000		(300,000)
Ending Balance at Mar. 31, 2022																																				5,491,500,000																																					2,949,600,000									2,541,900,000
Ending Balance at Mar. 31, 2022	$ 24,038,100,000																											4,748,000,000				3,664,100,000													2,849,500,000						2,914,500,000				2,297,400,000				3,543,800,000					$ 3,411,100,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	7,964,500,000	1,828,700,000	1,553,900,000		980,900,000	838,800,000	1,039,000,000	1,442,200,000	11,985,100,000		2,635,800,000	2,116,400,000		1,813,000,000	1,754,500,000	1,101,200,000	2,095,000,000	430,600,000	23,100,000	(6,200,000)	(1,000,000.0)	0	6,400,000	246,800,000	100,000
Ending Balance, Shares at Mar. 31, 2022																																																																524,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends Per Share, Declared	$ 0.78
Beginning Balance at Dec. 31, 2021																																				5,376,100,000																																					2,949,600,000									2,426,500,000
Beginning Balance at Dec. 31, 2021	$ 22,680,200,000																											4,647,900,000				3,594,200,000													2,784,700,000						2,846,300,000				2,291,600,000				3,149,800,000					$ 3,408,700,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	7,172,600,000	1,828,700,000	1,553,900,000		980,900,000	838,800,000	1,039,000,000	1,092,200,000	11,667,100,000		2,534,400,000	2,046,800,000		1,748,500,000	1,686,300,000	1,095,400,000	2,050,900,000	184,800,000	24,400,000	(6,500,000)	(1,300,000)	0	6,700,000	247,000,000.0	(100,000)
Beginning Balance, Shares at Dec. 31, 2021																																																																524,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends Paid on Common Stock																												(37,500,000)								(90,000,000.0)									(50,000,000.0)						(30,000,000.0)				0				(12,500,000)
Net Income (Loss)	1,239,200,000																																																										120,800,000
Net Income (Loss) Attributable to Noncontrolling Interests	(300,000)																																																										3,100,000
Net Income (Loss)	1,238,900,000						$ 0			$ 181,900,000				$ (179,500,000)				$ 316,400,000		$ 317,600,000				$ 602,500,000				210,400,000				159,600,000				273,900,000				$ 0	$ 273,800,000		$ 100,000	[3]	156,700,000						158,000,000.0				48,800,000				123,900,000
Other Comprehensive Income (Loss)	366,600,000																											(2,500,000)				500,000													600,000														(800,000)
Ending Balance at Jun. 30, 2022																																				5,562,800,000																																					2,952,400,000									2,610,400,000
Ending Balance at Jun. 30, 2022	24,297,000,000																											4,821,100,000				3,755,600,000													2,893,300,000						2,975,000,000				2,342,600,000				3,611,100,000					$ 3,412,000,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	7,984,000,000	1,831,500,000	1,555,200,000		982,200,000	839,500,000	1,041,200,000	1,444,400,000	12,108,600,000		2,707,300,000	2,206,400,000		1,855,200,000	1,814,300,000	1,144,200,000	2,159,200,000	551,400,000	21,900,000	(6,000,000.0)	(700,000)	0	5,900,000	241,000,000.0	1,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contributions from Parent																												2,800,000				1,300,000				2,800,000									1,300,000						700,000				2,200,000				352,200,000
Ending Balance, Shares at Jun. 30, 2022																																																																524,900,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Revenue from Contracts with Customers	9,232,300,000	$ 5,241,800,000	$ 2,539,000,000	$ 1,263,900,000	$ 187,600,000		0				$ 1,263,900,000					$ 25,100,000	[2]		$ 162,500,000		$ 2,539,000,000				$ 5,241,800,000				$ 1,552,000,000	$ 8,900,000			$ 891,600,000	$ 2,200,000			$ 172,600,000			0		$ 162,300,000	0			$ 9,100,000	$ 1,216,400,000	$ 5,600,000		$ 25,100,000		$ 1,641,400,000	$ 3,900,000			$ 826,400,000	$ 2,700,000			$ 25,500,000	$ 1,004,900,000	$ 1,000,000.0
Revenues	9,232,300,000				301,100,000	[4],[5]	(765,500,000)	$ (4,900,000)	[4],[5]	1,278,900,000		$ 287,700,000	[4],[5]	44,400,000		5,100,000	[4],[5]	790,200,000		2,548,400,000		$ 13,100,000	[4],[5]	5,335,900,000		$ 100,000	[4],[5]	1,680,900,000		100,000	[6]	895,500,000		0	[6]	764,800,000		$ 0	[6]	0	764,800,000		0		1,256,200,000			(100,000)	[6]		1,652,900,000		13,100,000	[6]	830,500,000		0	[6]	1,031,400,000			0	[6]
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax																																					162,300,000
Revenues from Related Parties, Net of Provisions for Refund																																				602,500,000
Beginning Balance at Mar. 31, 2022																																				5,491,500,000																																					2,949,600,000									2,541,900,000
Beginning Balance at Mar. 31, 2022	24,038,100,000																											4,748,000,000				3,664,100,000													2,849,500,000						2,914,500,000				2,297,400,000				3,543,800,000					$ 3,411,100,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	7,964,500,000	1,828,700,000	1,553,900,000		980,900,000	838,800,000	1,039,000,000	1,442,200,000	11,985,100,000		2,635,800,000	2,116,400,000		1,813,000,000	1,754,500,000	1,101,200,000	2,095,000,000	430,600,000	23,100,000	(6,200,000)	(1,000,000.0)	0	6,400,000	246,800,000	100,000
Beginning Balance, Shares at Mar. 31, 2022																																																																524,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Value	3,200,000																																																															$ 900,000						2,300,000
Issuance of Common Stock, Shares																																																																100,000
Common Stock Dividends	(404,700,000)																																																																													(402,600,000)	[1]
Common Stock Dividends																												(18,700,000)																	(25,000,000.0)						(15,000,000.0)								(12,500,000)																					(18,700,000)			(25,000,000.0)	(15,000,000.0)		(12,500,000)
Common Stock Dividends																																																											(700,000)																																		(2,100,000)	(700,000)
Other Changes in Equity	18,800,000																																																																					17,200,000								1,600,000
Capital Contribution from Member																																1,300,000				2,800,000									1,300,000						700,000								2,200,000													1,300,000	2,800,000	1,300,000	700,000		2,200,000
Dividends Paid on Common Stock																																				(50,000,000.0)																																														(50,000,000.0)
Net Income (Loss)	524,500,000																																																										76,700,000																			524,500,000								76,700,000
Net Income (Loss) Attributable to Noncontrolling Interests	(3,700,000)																																																										2,100,000																																		(3,700,000)	2,100,000
Net Income (Loss)	520,800,000						0			65,900,000				(155,900,000)				142,700,000		164,800,000				303,300,000				90,200,000				90,000,000.0				118,500,000				0	118,400,000		100,000	[3]	67,200,000						74,800,000				43,000,000.0				78,800,000																					90,200,000	90,000,000.0	118,500,000	67,200,000	74,800,000	43,000,000.0
Other Comprehensive Income (Loss)	120,800,000																											(1,200,000)				200,000													300,000														(500,000)																												120,800,000	(1,200,000)	200,000	300,000		(500,000)
Ending Balance at Jun. 30, 2022																																				5,562,800,000																																					2,952,400,000									2,610,400,000
Ending Balance at Jun. 30, 2022	$ 24,297,000,000																											4,821,100,000				3,755,600,000													2,893,300,000						2,975,000,000				2,342,600,000				3,611,100,000					$ 3,412,000,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	7,984,000,000	1,831,500,000	1,555,200,000		982,200,000	839,500,000	1,041,200,000	1,444,400,000	12,108,600,000		2,707,300,000	2,206,400,000		1,855,200,000	1,814,300,000	1,144,200,000	2,159,200,000	551,400,000	21,900,000	(6,000,000.0)	(700,000)	0	5,900,000	241,000,000.0	1,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contributions from Parent																												2,800,000																											2,200,000																2,800,000					2,200,000
Ending Balance, Shares at Jun. 30, 2022																																																																524,900,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends Per Share, Declared	$ 0.78
Revenue from Contracts with Customers	$ 4,639,700,000	2,595,000,000	1,296,800,000	654,400,000	93,500,000		0				654,400,000					14,400,000	[2]		79,100,000		1,296,800,000				2,595,000,000				704,900,000	5,600,000			476,900,000	1,100,000			85,600,000			0		77,300,000	0			7,100,000	604,400,000	2,800,000		16,700,000		817,200,000	1,800,000			440,000,000.0	2,100,000			15,500,000	520,700,000	400,000
Revenues	4,639,700,000				135,700,000	[7],[8]	(373,300,000)	(2,000,000.0)	[7],[8]	659,600,000		128,500,000	[7],[8]	24,500,000		2,300,000	[7],[8]	378,800,000		1,301,600,000		6,800,000	[7],[8]	2,648,500,000		100,000	[7],[8]	773,600,000		0	[9]	478,800,000		0	[9]	364,400,000		0	[9]	0	364,400,000		0		631,000,000.0			0	[9]		822,900,000		6,800,000	[9]	442,900,000		0	[9]	536,600,000			0	[9]
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax																																					77,300,000
Revenues from Related Parties, Net of Provisions for Refund																																				287,100,000
Beginning Balance at Dec. 31, 2022																																				5,873,000,000																																					3,022,300,000									2,850,700,000
Beginning Balance at Dec. 31, 2022	$ 24,122,400,000																											4,975,400,000				3,904,300,000													3,008,300,000						3,088,100,000				$ 2,419,100,000				3,674,800,000					$ 3,413,100,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	8,051,000,000	1,828,700,000	1,558,200,000		988,800,000	837,800,000	1,042,600,000	1,442,200,000	12,345,600,000		2,891,100,000	2,354,700,000		1,963,200,000	1,929,100,000	1,218,000,000	2,236,000,000	83,700,000	(4,800,000)	(8,600,000)	(300,000)	1,300,000	(4,200,000)	229,000,000.0	700,000
Beginning Balance, Shares at Dec. 31, 2022	525,099,321																																																						10,482,000									525,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Value	$ 41,100,000																																																															$ 5,100,000						36,000,000.0
Issuance of Common Stock, Shares																																																																800,000
Common Stock Dividends	(431,800,000)																																																																													(428,800,000)	[10]
Common Stock Dividends																																													(31,200,000)										$ (17,500,000)																												(31,200,000)		(17,500,000)
Common Stock Dividends																																																											(1,500,000)																																		(3,000,000.0)	(1,500,000)
Other Changes in Equity	(12,500,000)																																																																					(12,700,000)																							200,000
Capital Contribution from Member																																100,000,000.0				25,000,000.0															50,000,000.0								50,000,000.0													100,000,000.0	25,000,000.0		50,000,000.0		50,000,000.0
Dividends Paid on Common Stock																																				(55,000,000.0)																																														(55,000,000.0)
Net Income (Loss)																																																																														397,000,000.0								40,600,000
Net Income (Loss) Attributable to Noncontrolling Interests																																																																																													3,400,000	1,200,000
Net Income (Loss)	400,400,000																											112,500,000				47,600,000				162,700,000									102,800,000						78,000,000.0				(2,300,000)				41,800,000																					112,500,000	47,600,000	162,700,000	102,800,000	78,000,000.0	(2,300,000)
Other Comprehensive Income (Loss)	(151,800,000)																											(1,000,000.0)				(600,000)													(2,600,000)										(1,500,000)				100,000																												(151,800,000)	(1,000,000.0)	(600,000)	(2,600,000)	(1,500,000)	100,000
Ending Balance at Mar. 31, 2023																																				6,005,700,000																																					3,047,300,000									2,958,400,000
Ending Balance at Mar. 31, 2023	$ 23,967,800,000																											5,086,900,000				4,051,300,000													3,077,300,000						3,216,100,000				2,397,800,000				3,765,200,000					$ 3,418,200,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	8,074,300,000	1,828,700,000	1,658,200,000		988,800,000	887,800,000	1,042,600,000	1,492,200,000	12,313,800,000		3,003,600,000	2,402,300,000		2,034,800,000	2,007,100,000	1,198,200,000	2,276,600,000	(68,100,000)	(5,800,000)	(9,200,000)	(2,900,000)	(200,000)	(4,100,000)	229,600,000	400,000
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
Beginning Balance at Dec. 31, 2022																																				5,873,000,000																																					3,022,300,000									2,850,700,000
Beginning Balance at Dec. 31, 2022	$ 24,122,400,000																											4,975,400,000				3,904,300,000													3,008,300,000						3,088,100,000				$ 2,419,100,000				3,674,800,000					$ 3,413,100,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	8,051,000,000	1,828,700,000	1,558,200,000		988,800,000	837,800,000	1,042,600,000	1,442,200,000	12,345,600,000		2,891,100,000	2,354,700,000		1,963,200,000	1,929,100,000	1,218,000,000	2,236,000,000	83,700,000	(4,800,000)	(8,600,000)	(300,000)	1,300,000	(4,200,000)	229,000,000.0	700,000
Beginning Balance, Shares at Dec. 31, 2022	525,099,321																																																						10,482,000									525,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends Paid on Common Stock																												0								(85,000,000.0)									(62,500,000)						0				$ (17,500,000)				(50,000,000.0)
Net Income (Loss)	$ 918,200,000																																																										121,600,000
Net Income (Loss) Attributable to Noncontrolling Interests	(1,700,000)																																																										1,500,000
Net Income (Loss)	916,500,000						0			(195,000,000.0)				(111,200,000)				379,700,000		302,400,000				540,600,000				155,400,000				156,700,000				338,400,000				0	335,800,000		2,600,000	[3]	177,600,000						145,700,000				48,700,000				123,100,000
Other Comprehensive Income (Loss)	(120,100,000)																											(2,000,000.0)				2,600,000													(2,800,000)														(300,000)
Ending Balance at Jun. 30, 2023																																				6,142,800,000																																					3,038,700,000									3,104,100,000
Ending Balance at Jun. 30, 2023	$ 24,123,600,000																											5,133,100,000				4,334,600,000													3,120,700,000						3,408,800,000				2,446,300,000				3,795,500,000					$ 3,421,500,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	8,110,800,000	1,833,000,000	1,829,200,000		988,900,000	1,012,800,000	1,040,100,000	1,492,200,000	12,405,500,000		3,046,500,000	2,511,400,000		2,078,300,000	2,074,800,000	1,249,200,000	2,307,600,000	(36,400,000)	(6,800,000)	(6,000,000.0)	(3,100,000)	(200,000)	(4,500,000)	222,200,000	100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contributions from Parent																												4,300,000				275,300,000				25,000,000.0									100,000						175,000,000.0				$ 0				50,000,000.0
Ending Balance, Shares at Jun. 30, 2023	526,387,081																																																						10,482,000									526,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Revenue from Contracts with Customers	$ 9,063,400,000	5,445,300,000	2,786,100,000	645,100,000	186,900,000		0				645,100,000					8,500,000	[2]		178,400,000		2,786,100,000				5,445,300,000				1,677,000,000	6,500,000			887,100,000	1,100,000			180,200,000			0		176,400,000	0			3,100,000	1,223,200,000	5,500,000		30,400,000		1,890,600,000	7,300,000			887,200,000	3,700,000			26,200,000	1,026,200,000	1,300,000
Revenues	9,063,400,000				(258,700,000)	[11],[12]	(907,900,000)	(2,900,000)	[11],[12]	658,400,000		(276,200,000)	[11],[12]	62,100,000		3,200,000	[11],[12]	914,100,000		2,804,400,000		17,200,000	[11],[12]	5,532,300,000		0	[11],[12]	1,814,200,000		0	[13]	890,700,000		0	[13]	886,500,000		0	[13]	0	886,500,000		0		1,262,200,000			0	[13]		1,913,700,000		17,100,000	[13]	$ 891,700,000		0	[13]	1,053,700,000			0	[13]
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax																																					176,400,000
Revenues from Related Parties, Net of Provisions for Refund																																				710,100,000
Beginning Balance at Mar. 31, 2023																																				6,005,700,000																																					3,047,300,000									2,958,400,000
Beginning Balance at Mar. 31, 2023	23,967,800,000																											5,086,900,000				4,051,300,000													3,077,300,000						3,216,100,000				2,397,800,000				3,765,200,000					$ 3,418,200,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	8,074,300,000	1,828,700,000	1,658,200,000		988,800,000	887,800,000	1,042,600,000	1,492,200,000	12,313,800,000		3,003,600,000	2,402,300,000		2,034,800,000	2,007,100,000	1,198,200,000	2,276,600,000	(68,100,000)	(5,800,000)	(9,200,000)	(2,900,000)	(200,000)	(4,100,000)	229,600,000	400,000
Beginning Balance, Shares at Mar. 31, 2023																																																																525,900,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Value	36,500,000																																																															$ 3,300,000						33,200,000
Issuance of Common Stock, Shares																																																																500,000
Common Stock Dividends	(431,800,000)																																																																													(429,500,000)	[10]
Common Stock Dividends																																													(31,300,000)														(50,000,000.0)																								(31,300,000)			(50,000,000.0)
Common Stock Dividends																																																											(600,000)																																		(2,300,000)	(600,000)
Other Changes in Equity	3,300,000																																																																					3,300,000
Capital Contribution from Member																																175,300,000													100,000						125,000,000.0																					175,300,000		100,000	125,000,000.0
Dividends Paid on Common Stock																																				(30,000,000.0)																																														(30,000,000.0)
Net Income (Loss)	521,200,000																																																										81,000,000.0																			521,200,000								81,000,000.0
Net Income (Loss) Attributable to Noncontrolling Interests	(5,100,000)																																																										300,000																																		(5,100,000)	300,000
Net Income (Loss)	516,100,000						0			(38,600,000)				(97,700,000)				197,300,000		176,700,000				278,400,000				42,900,000				109,100,000				175,700,000				0	174,200,000		1,500,000	[3]	74,800,000						67,700,000				51,000,000.0				81,300,000																					42,900,000	109,100,000	175,700,000	74,800,000	67,700,000	51,000,000.0
Other Comprehensive Income (Loss)	31,700,000																											(1,000,000.0)				3,200,000													(200,000)														(400,000)																												31,700,000	(1,000,000.0)	3,200,000	(200,000)		(400,000)
Ending Balance at Jun. 30, 2023																																				6,142,800,000																																					3,038,700,000									$ 3,104,100,000
Ending Balance at Jun. 30, 2023	$ 24,123,600,000																											5,133,100,000				4,334,600,000													3,120,700,000						3,408,800,000				2,446,300,000				3,795,500,000					$ 3,421,500,000	$ 260,400,000	$ 56,600,000	$ 321,200,000	$ 157,200,000	$ 100,000	$ 8,110,800,000	1,833,000,000	1,829,200,000		$ 988,900,000	$ 1,012,800,000	1,040,100,000	$ 1,492,200,000	$ 12,405,500,000		$ 3,046,500,000	$ 2,511,400,000		$ 2,078,300,000	$ 2,074,800,000	$ 1,249,200,000	$ 2,307,600,000	$ (36,400,000)	$ (6,800,000)	$ (6,000,000.0)	$ (3,100,000)	$ (200,000)	$ (4,500,000)	$ 222,200,000	$ 100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital Contributions from Parent																												4,300,000																																											$ 4,300,000
Return of Capital to Parent Equity Statement																																(4,300,000)				(8,600,000)																			$ (2,500,000)																	$ (4,300,000)	$ (8,600,000)			$ (2,500,000)
Ending Balance, Shares at Jun. 30, 2023	526,387,081																																																						10,482,000									526,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends Per Share, Declared	$ 0.83
Revenue from Contracts with Customers	$ 4,372,500,000	$ 2,629,000,000	$ 1,330,800,000	$ 318,200,000	94,500,000		0				$ 318,200,000					6,200,000	[2]		$ 88,300,000		$ 1,330,800,000				$ 2,629,000,000				$ 762,500,000	2,900,000			$ 459,400,000	500,000			90,200,000			0		$ 87,400,000	0			$ 1,900,000	$ 580,400,000	2,400,000		$ 14,500,000		$ 868,800,000	2,100,000			$ 472,400,000	2,200,000			$ 14,500,000	$ 522,500,000	800,000
Revenues	$ 4,372,500,000				$ (128,800,000)	[14]	$ (464,200,000)	$ (2,000,000.0)	[14]	$ 331,400,000		$ (135,200,000)	[14],[15]	$ 32,000,000.0		$ 2,200,000	[14]	$ 458,600,000		$ 1,340,200,000		$ 6,100,000	[14]	$ 2,674,500,000		$ 100,000	[14]	$ 826,500,000		$ 0	[16]	$ 461,200,000		$ 0	[16]	444,900,000		$ 0	[16]	$ 0	$ 444,900,000		$ 0		$ 599,200,000			$ 0	[16]		$ 879,100,000		$ 6,000,000.0	[16]	$ 474,700,000		$ 0	[16]	$ 537,800,000			$ 0	[16]
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax																																					$ 87,400,000
Revenues from Related Parties, Net of Provisions for Refund																																				$ 357,500,000

[1] Cash dividends declared per AEP common share were $0.78.

[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] Amounts include affiliated and nonaffiliated revenues.

[5] Generation & Marketing includes economic hedge activity.

[6] Amounts include affiliated and nonaffiliated revenues.

[7] Amounts include affiliated and nonaffiliated revenues

[8] Generation & Marketing includes economic hedge activity.

[9] Amounts include affiliated and nonaffiliated revenues.

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

[11] Amounts include affiliated and nonaffiliated revenues.

[12] Generation & Marketing includes economic hedge activity.

[13] Amounts include affiliated and nonaffiliated revenues.

[14] Amounts include affiliated and nonaffiliated revenues.

[15] Generation & Marketing includes economic hedge activity.

[16] Amounts include affiliated and nonaffiliated revenues.