Significant Accounting Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		$ 683,700	$ 796,000	$ 1,922,900	$ 1,949,200
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 1.33	$ 1.59	$ 3.76	$ 3.90
Weighted Average Dilutive Effect of:
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 1.33	$ 1.58	$ 3.75	$ 3.89
Organization and Summary of Significant Accounting Policies (Textuals)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				0	377,000
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 522,200		$ 522,200		$ 403,400
Restricted Cash		55,100		55,100		48,000
Total Cash, Cash Equivalents and Restricted Cash		577,300	$ 1,426,700	577,300	$ 1,426,700	451,400	$ 438,300
Proceeds from Issuance of Debt	[1]			3,457,200
Securities Received as Collateral		847,000		847,000		263,000
Obligation to Return Securities Received as Collateral		$ 0		$ 0		3,000
Weighted Average Number of Diluted AEP Common Shares Outstanding		515,315,994	502,606,836	512,714,006	500,600,237
Weighted Average Number of Basic AEP Common Shares Outstanding		513,730,196	501,233,680	511,162,723	499,418,278
AEP Texas Inc. [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 100		$ 100		100
Restricted Cash		47,700		47,700		30,400
Total Cash, Cash Equivalents and Restricted Cash		47,800	$ 44,000	47,800	$ 44,000	30,500	28,800
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		6,700		6,700		2,500
Restricted Cash		7,400		7,400		17,600
Total Cash, Cash Equivalents and Restricted Cash		14,100	15,100	14,100	15,100	20,100	22,700
Indiana Michigan Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		25,800	3,200	25,800	3,200	1,300	3,300
Ohio Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		10,200		10,200		3,000
Total Cash, Cash Equivalents and Restricted Cash		10,200	6,800	10,200	6,800	3,000	7,400
Public Service Co Of Oklahoma [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		5,500	3,600	5,500	3,600	1,300	2,600
Southwestern Electric Power Co [Member]
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		139,400	108,900	260,200	208,100
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 84,400	$ 45,000	$ 84,400	$ 45,000	$ 51,200	$ 13,200
Restricted Stock Units and Performance Share Units [Member]
Weighted Average Dilutive Effect of:
Weighted Average Dilutive Effect of Shares		1,600,000	1,400,000	1,500,000	1,200,000
Dilutive Securities, Effect on Basic Earnings Per Share		$ 0	$ (0.01)	$ (0.01)	$ (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.