Significant Accounting Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		$ 521,200	$ 524,500	$ 918,200	$ 1,239,200
Weighted Average Number of Basic AEP Common Shares Outstanding		514,879,144	513,623,431	514,529,837	509,857,710
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 1.01	$ 1.02	$ 1.78	$ 2.43
Weighted Average Dilutive Effect of:
Weighted Average Number of Diluted AEP Common Shares Outstanding		516,242,919	515,162,210	515,922,446	511,391,735
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 1.01	$ 1.02	$ 1.78	$ 2.42
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 304,900		$ 304,900		$ 509,400
Restricted Cash		45,800		45,800		47,100
Total Cash, Cash Equivalents and Restricted Cash		350,700	$ 621,200	350,700	$ 621,200	556,500	$ 451,400
Proceeds from Issuance of Debt	[1]			4,003,000
Securities Received as Collateral		73,000		73,000		481,000
Obligation to Return Securities Received as Collateral		35,000		35,000		2,000
AEP Texas Inc. [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		100		100		100
Restricted Cash		30,700		30,700		32,700
Total Cash, Cash Equivalents and Restricted Cash		30,800	29,800	30,800	29,800	32,800	30,500
AEP Transmission Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		0	0	0	0	0	0
Appalachian Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		6,800		6,800		7,500
Restricted Cash		15,100		15,100		14,400
Total Cash, Cash Equivalents and Restricted Cash		21,900	21,100	21,900	21,100	21,900	20,100
Indiana Michigan Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		3,800	2,800	3,800	2,800	4,200	1,300
Ohio Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		9,700		9,700		9,600
Total Cash, Cash Equivalents and Restricted Cash		9,700	6,900	9,700	6,900	9,600	3,000
Public Service Co Of Oklahoma [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		4,600	3,600	4,600	3,600	4,000	1,300
Southwestern Electric Power Co [Member]
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		81,000	76,700	121,600	120,800
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 4,600	$ 63,700	$ 4,600	$ 63,700	$ 88,400	$ 51,200
Restricted Stock Units and Performance Share Units [Member]
Weighted Average Dilutive Effect of:
Weighted Average Dilutive Effect of Shares		1,300,000	1,600,000	1,400,000	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.