Significant Accounting Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		$ 959,600	$ 953,700	$ 2,303,000	$ 1,871,900
Weighted Average Number of Basic AEP Common Shares Outstanding		532,208,876	520,459,880	529,230,818	516,528,239
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 1.80	$ 1.83	$ 4.35	$ 3.62
Weighted Average Dilutive Effect of:
Weighted Average Number of Diluted AEP Common Shares Outstanding		533,600,842	521,444,125	530,456,985	517,784,726
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 1.80	$ 1.83	$ 4.34	$ 3.62
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 245,800		$ 245,800		$ 330,100
Restricted Cash		53,400		53,400		48,900
Total Cash, Cash Equivalents and Restricted Cash		299,200	$ 407,100	299,200	$ 407,100	379,000	$ 556,500
Proceeds from Issuance of Debt	[1]			3,786,400
Securities Received as Collateral		44,000		44,000		46,000
Cash Paid for Interest, Net of Capitalized Amounts				1,247,300	1,148,700
Net Cash Paid (Received) for Income Taxes				87,900	26,700
Cash Paid (Received) for Transferable Tax Credits				(163,700)	0
Noncash Acquisitions Under Finance Leases				24,500	38,500
Construction in Progress Expenditures Incurred but Not yet Paid				1,015,100	975,000
Acquisition Of Nuclear Fuel Included In Current Liabilities				8,200	9,500
Increase (Decrease) in Accounts Payable				14,200	(163,000)
Net Cash Provided by (Used in) Operating Activities				5,076,900	3,675,700
Payments for Nuclear Fuel				(98,400)	(60,900)
Net Cash Provided by (Used in) Investing Activities				(4,769,500)	(4,643,500)
Competitive Contracted Renewable Portfolio
Cash, Cash Equivalents and Restricted Cash
Noncash or Part Noncash Divestiture, Amount of Consideration Received				0	74,700
AEP Texas Inc. [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		100		100		100
Restricted Cash		45,100		45,100		34,000
Total Cash, Cash Equivalents and Restricted Cash		45,200	47,000	45,200	47,000	34,100	32,800
Cash Paid for Interest, Net of Capitalized Amounts				132,800	135,900
Net Cash Paid (Received) for Income Taxes				(2,700)	4,300
Noncash Acquisitions Under Finance Leases				3,600	3,700
Construction in Progress Expenditures Incurred but Not yet Paid				167,300	153,600
Increase (Decrease) in Accounts Payable				23,600	700
Net Cash Provided by (Used in) Operating Activities				735,600	503,100
Net Cash Provided by (Used in) Investing Activities				(1,052,900)	(1,175,000)
AEP Transmission Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		0	0	0	0	0	0
Cash Paid for Interest, Net of Capitalized Amounts				128,000	116,900
Net Cash Paid (Received) for Income Taxes				5,700	55,000
Construction in Progress Expenditures Incurred but Not yet Paid				221,300	219,200
Increase (Decrease) in Accounts Payable				(16,100)	25,000
Net Cash Provided by (Used in) Operating Activities				896,700	825,500
Net Cash Provided by (Used in) Investing Activities				(1,144,000)	(1,306,300)
Appalachian Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		6,500		6,500		5,000
Restricted Cash		8,300		8,300		14,900
Total Cash, Cash Equivalents and Restricted Cash		14,800	11,400	14,800	11,400	19,900	21,900
Cash Paid for Interest, Net of Capitalized Amounts				159,600	166,600
Net Cash Paid (Received) for Income Taxes				27,400	40,300
Cash Paid (Received) for Transferable Tax Credits				(200)	0
Noncash Acquisitions Under Finance Leases				900	4,100
Construction in Progress Expenditures Incurred but Not yet Paid				129,900	138,700
Increase (Decrease) in Accounts Payable				50,400	(129,500)
Net Cash Provided by (Used in) Operating Activities				936,800	610,200
Net Cash Provided by (Used in) Investing Activities				(694,300)	(815,800)
Indiana Michigan Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		4,100	2,700	4,100	2,700	2,100	4,200
Cash Paid for Interest, Net of Capitalized Amounts				111,500	100,100
Net Cash Paid (Received) for Income Taxes				(4,400)	36,200
Noncash Acquisitions Under Finance Leases				1,100	3,600
Construction in Progress Expenditures Incurred but Not yet Paid				69,600	70,600
Acquisition Of Nuclear Fuel Included In Current Liabilities				8,200	9,500
Increase (Decrease) in Accounts Payable				(57,700)	(34,800)
Net Cash Provided by (Used in) Operating Activities				678,400	734,400
Payments for Nuclear Fuel				(98,400)	(60,900)
Net Cash Provided by (Used in) Investing Activities				(580,400)	(516,100)
Ohio Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		9,600		9,600		6,400
Total Cash, Cash Equivalents and Restricted Cash		9,600	6,800	9,600	6,800	6,400	9,600
Cash Paid for Interest, Net of Capitalized Amounts				82,800	76,500
Net Cash Paid (Received) for Income Taxes				(5,100)	16,000
Noncash Acquisitions Under Finance Leases				1,100	3,300
Construction in Progress Expenditures Incurred but Not yet Paid				126,800	99,600
Increase (Decrease) in Accounts Payable				(43,400)	1,800
Net Cash Provided by (Used in) Operating Activities				526,100	224,700
Net Cash Provided by (Used in) Investing Activities				(756,500)	(735,100)
Public Service Co Of Oklahoma [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		4,800	3,700	4,800	3,700	2,500	4,000
Cash Paid for Interest, Net of Capitalized Amounts				86,400	67,400
Net Cash Paid (Received) for Income Taxes				(27,200)	(1,600)
Cash Paid (Received) for Transferable Tax Credits				(76,900)	0
Noncash Acquisitions Under Finance Leases				1,200	1,900
Construction in Progress Expenditures Incurred but Not yet Paid				76,700	91,000
Increase (Decrease) in Accounts Payable				9,600	(19,500)
Net Cash Provided by (Used in) Operating Activities				463,200	480,700
Net Cash Provided by (Used in) Investing Activities				(397,800)	(547,200)
Southwestern Electric Power Co [Member]
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		139,100	157,500	277,100	279,100
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 4,400	$ 3,600	4,400	3,600	$ 2,400	$ 88,400
Cash Paid for Interest, Net of Capitalized Amounts				107,100	89,800
Net Cash Paid (Received) for Income Taxes				(11,200)	(23,300)
Cash Paid (Received) for Transferable Tax Credits				(69,400)	0
Noncash Acquisitions Under Finance Leases				1,900	4,600
Construction in Progress Expenditures Incurred but Not yet Paid				84,900	69,000
Increase (Decrease) in Accounts Payable				7,600	5,300
Net Cash Provided by (Used in) Operating Activities				649,400	627,700
Net Cash Provided by (Used in) Investing Activities				$ (529,300)	$ (612,900)
Restricted Stock Units and Performance Share Units [Member]
Weighted Average Dilutive Effect of:
Weighted Average Dilutive Effect of Shares		1,400,000	900,000	1,300,000	1,300,000
Dilutive Securities, Effect on Basic Earnings Per Share		$ 0	$ 0	$ (0.01)	$ 0

[1] Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.