Condensed Consolidated Statements of Changes in Equity - USD ($)	Total	Generation And Marketing [Member]	Appalachian Power Co [Member]	AEP Texas Inc. [Member]	AEP Transmission Co [Member]	Indiana Michigan Power Co [Member]	Ohio Power Co [Member]	Public Service Co Of Oklahoma [Member]	Southwestern Electric Power Co [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]	Dry Lake Solar Project	Dry Lake Solar Project Noncontrolling Interests [Member]	Dry Lake Solar Project Noncontrolling Interests [Member] Generation And Marketing [Member]
Beginning Balance at Dec. 31, 2020					$ 4,712,900,000														$ 2,765,600,000									$ 1,947,300,000
Beginning Balance at Dec. 31, 2020	$ 20,774,500,000		$ 4,344,300,000	$ 3,206,000,000		$ 2,749,200,000	$ 2,692,700,000	$ 1,545,600,000	$ 2,627,700,000	$ 3,359,300,000	$ 260,400,000	$ 56,600,000	$ 321,200,000	$ 157,200,000	$ 100,000	$ 6,588,900,000	$ 1,828,700,000	$ 1,457,900,000		$ 980,900,000	$ 838,800,000	$ 414,000,000.0	$ 812,200,000	$ 10,687,800,000		$ 2,248,000,000	$ 1,757,000,000		$ 1,718,700,000	$ 1,532,700,000	$ 974,300,000	$ 1,811,900,000	$ (85,100,000)	$ 7,200,000	$ (8,900,000)	$ (7,000,000.0)	$ 100,000	$ 1,900,000	$ 223,600,000	$ 1,600,000
Beginning Balance, Shares at Dec. 31, 2020										516,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Value	184,600,000									$ 17,100,000						167,500,000
Issuance of Common Stock, Shares										2,700,000
Common Stock Dividends	(372,000,000.0)																							(369,500,000)	[1]
Common Stock Dividends			(12,500,000)			(25,000,000.0)	(21,900,000)																			(12,500,000)			(25,000,000.0)	(21,900,000)
Common Stock Dividends									(1,000,000.0)																														(2,500,000)	(1,000,000.0)
Other Changes in Equity	(19,100,000)															(21,900,000)								(600,000)															3,400,000
Capital Contribution from Member					124,000,000.0			425,000,000.0	100,000,000.0										124,000,000.0			425,000,000.0	100,000,000.0
Acquisition																																									$ 18,900,000	$ 18,900,000
Net Income (Loss)																								575,000,000.0								62,400,000
Net Income (Loss) Attributable to Noncontrolling Interests																																							3,800,000	1,000,000.0
Net Income (Loss)	578,800,000		122,500,000	46,100,000	151,700,000	70,800,000	68,200,000	(2,700,000)	63,400,000																	122,500,000	46,100,000	151,700,000	70,800,000	68,200,000	(2,700,000)
Other Comprehensive Income (Loss)	54,300,000		7,900,000	300,000		500,000		(100,000)																									54,300,000	7,900,000	300,000	500,000	(100,000)
Ending Balance at Mar. 31, 2021					4,988,600,000														2,889,600,000									2,099,000,000
Ending Balance at Mar. 31, 2021	$ 21,220,000,000		4,462,200,000	3,252,400,000		2,795,500,000	2,739,000,000	1,967,800,000	2,790,100,000	$ 3,376,400,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	6,734,500,000	1,828,700,000	1,457,900,000		980,900,000	838,800,000	839,000,000.0	912,200,000	10,892,700,000		2,358,000,000	1,803,100,000		1,764,500,000	1,579,000,000	971,600,000	1,874,300,000	(30,800,000)	15,100,000	(8,600,000)	(6,500,000)	0	1,900,000	247,200,000	1,600,000
Ending Balance, Shares at Mar. 31, 2021										519,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends Per Share, Declared	$ 0.74
Beginning Balance at Dec. 31, 2020					4,712,900,000														2,765,600,000									1,947,300,000
Beginning Balance at Dec. 31, 2020	$ 20,774,500,000		4,344,300,000	3,206,000,000		2,749,200,000	2,692,700,000	1,545,600,000	2,627,700,000	$ 3,359,300,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	6,588,900,000	1,828,700,000	1,457,900,000		980,900,000	838,800,000	414,000,000.0	812,200,000	10,687,800,000		2,248,000,000	1,757,000,000		1,718,700,000	1,532,700,000	974,300,000	1,811,900,000	(85,100,000)	7,200,000	(8,900,000)	(7,000,000.0)	100,000	1,900,000	223,600,000	1,600,000
Beginning Balance, Shares at Dec. 31, 2020										516,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends Paid on Common Stock			(25,000,000.0)		0	(100,000,000.0)	(43,800,000)	(10,000,000.0)	0
Net Income (Loss)	1,153,200,000								99,200,000
Net Income (Loss) Attributable to Noncontrolling Interests	(600,000)								1,600,000
Net Income (Loss)	1,152,600,000	$ 84,700,000	188,800,000	125,900,000	300,300,000	128,000,000.0	142,200,000	43,400,000	100,800,000
Other Comprehensive Income (Loss)	182,100,000		6,700,000	600,000		800,000			0
Ending Balance at Jun. 30, 2021					5,197,200,000														2,949,600,000									2,247,600,000
Ending Balance at Jun. 30, 2021	21,629,900,000		4,514,800,000	3,332,500,000		2,778,000,000	2,791,100,000	2,203,900,000	2,901,900,000	$ 3,382,700,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	6,800,300,000	1,828,700,000	1,457,900,000		980,900,000	838,800,000	1,039,000,000	987,200,000	11,098,700,000		2,411,800,000	1,882,900,000		1,746,700,000	1,631,100,000	1,007,700,000	1,911,100,000	97,000,000.0	13,900,000	(8,300,000)	(6,200,000)	0	1,900,000	251,200,000	1,600,000
Ending Balance, Shares at Jun. 30, 2021										520,400,000
Beginning Balance at Mar. 31, 2021					4,988,600,000														2,889,600,000									2,099,000,000
Beginning Balance at Mar. 31, 2021	21,220,000,000		4,462,200,000	3,252,400,000		2,795,500,000	2,739,000,000	1,967,800,000	2,790,100,000	$ 3,376,400,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	6,734,500,000	1,828,700,000	1,457,900,000		980,900,000	838,800,000	839,000,000.0	912,200,000	10,892,700,000		2,358,000,000	1,803,100,000		1,764,500,000	1,579,000,000	971,600,000	1,874,300,000	(30,800,000)	15,100,000	(8,600,000)	(6,500,000)	0	1,900,000	247,200,000	1,600,000
Beginning Balance, Shares at Mar. 31, 2021										519,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Value	72,300,000									$ 6,300,000						66,000,000.0
Issuance of Common Stock, Shares										900,000
Common Stock Dividends	(374,500,000)							(10,000,000.0)																(371,800,000)	[1]						(10,000,000.0)
Common Stock Dividends			(12,500,000)			(75,000,000.0)	(21,900,000)																			(12,500,000)			(75,000,000.0)	(21,900,000)
Common Stock Dividends									(600,000)																														(2,700,000)	(600,000)
Other Changes in Equity	10,500,000															(200,000)								(400,000)															11,100,000
Capital Contribution from Member					60,000,000.0			200,000,000.0	75,000,000.0										60,000,000.0			200,000,000.0	75,000,000.0
Net Income (Loss)	578,200,000								36,800,000															578,200,000								36,800,000
Net Income (Loss) Attributable to Noncontrolling Interests	(4,400,000)								600,000																														(4,400,000)	600,000
Net Income (Loss)	573,800,000	46,500,000	66,300,000	79,800,000	148,600,000	57,200,000	74,000,000.0	46,100,000	37,400,000																	66,300,000	79,800,000	148,600,000	57,200,000	74,000,000.0	46,100,000
Other Comprehensive Income (Loss)	127,800,000		(1,200,000)	300,000		300,000			0																								127,800,000	(1,200,000)	300,000	300,000
Ending Balance at Jun. 30, 2021					5,197,200,000														2,949,600,000									2,247,600,000
Ending Balance at Jun. 30, 2021	$ 21,629,900,000		4,514,800,000	3,332,500,000		2,778,000,000	2,791,100,000	2,203,900,000	2,901,900,000	$ 3,382,700,000	260,400,000	56,600,000	321,200,000	157,200,000	100,000	6,800,300,000	1,828,700,000	1,457,900,000		980,900,000	838,800,000	1,039,000,000	987,200,000	11,098,700,000		2,411,800,000	1,882,900,000		1,746,700,000	1,631,100,000	1,007,700,000	1,911,100,000	97,000,000.0	13,900,000	(8,300,000)	(6,200,000)	0	1,900,000	251,200,000	1,600,000
Ending Balance, Shares at Jun. 30, 2021										520,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends Per Share, Declared	$ 0.74
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	524,416,175							10,482,000		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)	[2]
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)															0
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	524,416,175							10,482,000		524,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition																																											$ 16,000,000
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	181,900,000	210,400,000	159,600,000	273,900,000	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
Ending Balance, Shares at Jun. 30, 2022	524,921,200							10,482,000		524,900,000
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)	[2]
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															0
Capital Contribution from Member			2,800,000	1,300,000	2,800,000	1,300,000	700,000	2,200,000	2,200,000								2,800,000	1,300,000	2,800,000	1,300,000	700,000	2,200,000	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	$ 65,900,000	90,200,000	90,000,000.0	118,500,000	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
Ending Balance, Shares at Jun. 30, 2022	524,921,200							10,482,000		524,900,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends Per Share, Declared	$ 0.78

[1] Cash dividends declared per AEP common share were $0.74.

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