Significant Accounting Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		$ 397,000	$ 714,700
Weighted Average Number of Basic AEP Common Shares Outstanding		514,176,648	506,050,147
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 0.77	$ 1.41
Weighted Average Dilutive Effect of:
Weighted Average Number of Diluted AEP Common Shares Outstanding		515,598,090	507,658,522
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 0.77	$ 1.41
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 343,500		$ 509,400
Restricted Cash		50,000		47,100
Total Cash, Cash Equivalents and Restricted Cash		393,500	$ 725,500	556,500	$ 451,400
Proceeds from Issuance of Debt	[1]	2,876,000
Securities Received as Collateral		108,000		481,000
AEP Texas Inc. [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		100		100
Restricted Cash		42,500		32,700
Total Cash, Cash Equivalents and Restricted Cash		42,600	40,000	32,800	30,500
AEP Transmission Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		0	0	0	0
Appalachian Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		7,100		7,500
Restricted Cash		7,500		14,400
Total Cash, Cash Equivalents and Restricted Cash		14,600	16,000	21,900	20,100
Indiana Michigan Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		8,500	3,300	4,200	1,300
Ohio Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		9,100		9,600
Total Cash, Cash Equivalents and Restricted Cash		9,100	7,400	9,600	3,000
Public Service Co Of Oklahoma [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		3,800	2,900	4,000	1,300
Southwestern Electric Power Co [Member]
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		40,600	44,100
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 8,200	$ 58,100	$ 88,400	$ 51,200
Restricted Stock Units and Performance Share Units [Member]
Weighted Average Dilutive Effect of:
Weighted Average Dilutive Effect of Shares		1,400,000	1,600,000
Dilutive Securities, Effect on Basic Earnings Per Share		$ 0	$ 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.