Significant Accounting Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		$ 524,500	$ 578,200	$ 1,239,200	$ 1,153,200
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 1.02	$ 1.16	$ 2.43	$ 2.31
Weighted Average Dilutive Effect of:
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 1.02	$ 1.15	$ 2.42	$ 2.31
Organization and Summary of Significant Accounting Policies (Textuals)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				0	0
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 575,300		$ 575,300		$ 403,400
Restricted Cash		45,900		45,900		48,000
Total Cash, Cash Equivalents and Restricted Cash		621,200	$ 359,700	621,200	$ 359,700	451,400	$ 438,300
Proceeds from Issuance of Debt	[1]			2,662,200
Securities Received as Collateral		1,100,000		1,100,000		263,000
Obligation to Return Securities Received as Collateral		$ 0		$ 0		3,000
Weighted Average Number of Diluted AEP Common Shares Outstanding		515,162,210	500,983,778	511,391,735	499,581,893
Weighted Average Number of Basic AEP Common Shares Outstanding		513,623,431	499,916,640	509,857,710	498,495,532
AEP Texas Inc. [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 100		$ 100		100
Restricted Cash		29,700		29,700		30,400
Total Cash, Cash Equivalents and Restricted Cash		29,800	$ 28,000	29,800	$ 28,000	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		4,900		4,900		2,500
Restricted Cash		16,200		16,200		17,600
Total Cash, Cash Equivalents and Restricted Cash		21,100	23,000	21,100	23,000	20,100	22,700
Indiana Michigan Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		2,800	2,500	2,800	2,500	1,300	3,300
Ohio Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		6,900		6,900		3,000
Total Cash, Cash Equivalents and Restricted Cash		6,900	5,800	6,900	5,800	3,000	7,400
Public Service Co Of Oklahoma [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		3,600	2,600	3,600	2,600	1,300	2,600
Southwestern Electric Power Co [Member]
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		76,700	36,800	120,800	99,200
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 63,700	$ 28,000	$ 63,700	$ 28,000	$ 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	1,100,000	1,500,000	1,100,000
Dilutive Securities, Effect on Basic Earnings Per Share		$ 0	$ (0.01)	$ (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.