Significant Accounting Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		$ 953,700	$ 683,700	$ 1,871,900	$ 1,922,900
Weighted Average Number of Basic AEP Common Shares Outstanding		520,459,880	513,730,196	516,528,239	511,162,723
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 1.83	$ 1.33	$ 3.62	$ 3.76
Weighted Average Dilutive Effect of:
Weighted Average Number of Diluted AEP Common Shares Outstanding		521,444,125	515,315,994	517,784,726	512,714,006
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 1.83	$ 1.33	$ 3.62	$ 3.75
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 353,300		$ 353,300		$ 509,400
Restricted Cash		53,800		53,800		47,100
Total Cash, Cash Equivalents and Restricted Cash		407,100	$ 577,300	407,100	$ 577,300	556,500	$ 451,400
Proceeds from Issuance of Debt	[1]			4,064,000
Securities Received as Collateral		93,000		93,000		481,000
Cash Paid for Interest, Net of Capitalized Amounts				1,148,700	856,800
Net Cash Paid (Received) for Income Taxes				26,700	104,100
Noncash Acquisitions Under Finance Leases				38,500	22,300
Construction Expenditures Included in Noncurrent Liabilities as of September 30,				975,000	985,800
Acquisition Of Nuclear Fuel Included In Current Liabilities				9,500	8,500
Competitive Contracted Renewable Portfolio
Cash, Cash Equivalents and Restricted Cash
Noncash or Part Noncash Divestiture, Amount of Consideration Received				74,700	0
AEP Texas Inc. [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		100		100		100
Restricted Cash		46,900		46,900		32,700
Total Cash, Cash Equivalents and Restricted Cash		47,000	47,800	47,000	47,800	32,800	30,500
Cash Paid for Interest, Net of Capitalized Amounts				135,900	121,100
Net Cash Paid (Received) for Income Taxes				4,300	10,000
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				116,900	88,600
Net Cash Paid (Received) for Income Taxes				55,000	53,200
Appalachian Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		4,500		4,500		7,500
Restricted Cash		6,900		6,900		14,400
Total Cash, Cash Equivalents and Restricted Cash		11,400	14,100	11,400	14,100	21,900	20,100
Cash Paid for Interest, Net of Capitalized Amounts				166,600	128,300
Net Cash Paid (Received) for Income Taxes				40,300	14,200
Indiana Michigan Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		2,700	25,800	2,700	25,800	4,200	1,300
Cash Paid for Interest, Net of Capitalized Amounts				100,100	101,600
Net Cash Paid (Received) for Income Taxes				36,200	(4,100)
Acquisition Of Nuclear Fuel Included In Current Liabilities				9,500	8,500
Ohio Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		6,800		6,800		9,600
Total Cash, Cash Equivalents and Restricted Cash		6,800	10,200	6,800	10,200	9,600	3,000
Cash Paid for Interest, Net of Capitalized Amounts				76,500	75,800
Net Cash Paid (Received) for Income Taxes				16,000	24,200
Public Service Co Of Oklahoma [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		3,700	5,500	3,700	5,500	4,000	1,300
Cash Paid for Interest, Net of Capitalized Amounts				67,400	63,100
Net Cash Paid (Received) for Income Taxes				(1,600)	21,900
Southwestern Electric Power Co [Member]
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		157,500	139,400	279,100	260,200
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 3,600	$ 84,400	3,600	84,400	$ 88,400	$ 51,200
Cash Paid for Interest, Net of Capitalized Amounts				89,800	102,100
Net Cash Paid (Received) for Income Taxes				$ (23,300)	$ 34,700
Restricted Stock Units and Performance Share Units [Member]
Weighted Average Dilutive Effect of:
Weighted Average Dilutive Effect of Shares		900,000	1,600,000	1,300,000	1,500,000
Dilutive Securities, Effect on Basic Earnings Per Share		$ 0	$ 0	$ 0	$ (0.01)

[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.