Significant Accounting Matters (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		$ 340,300	$ 521,200	$ 1,343,400	$ 918,200
Weighted Average Number of Basic AEP Common Shares Outstanding		528,898,816	514,879,144	527,725,426	514,529,837
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 0.64	$ 1.01	$ 2.55	$ 1.78
Weighted Average Dilutive Effect of:
Weighted Average Number of Diluted AEP Common Shares Outstanding		530,140,990	516,242,919	528,868,693	515,922,446
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 0.64	$ 1.01	$ 2.54	$ 1.78
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 202,500		$ 202,500		$ 330,100
Restricted Cash		45,400		45,400		48,900
Total Cash, Cash Equivalents and Restricted Cash		247,900	$ 350,700	247,900	$ 350,700	379,000	$ 556,500
Proceeds from Issuance of Debt	[1]			3,698,400
Securities Received as Collateral		155,000		155,000		46,000
Cash Paid for Interest, Net of Capitalized Amounts				881,000	773,500
Net Cash Paid (Received) for Income Taxes				60,800	9,900
Acquisition Of Nuclear Fuel Included In Current Liabilities				8,200	(36,000)
Increase (Decrease) in Accounts Payable				77,000	62,600
Net Cash Provided by (Used in) Operating Activities				2,904,200	1,881,600
Payments for Nuclear Fuel				(69,800)	(73,900)
Net Cash Provided by (Used in) Investing Activities				(3,249,700)	(4,265,500)
AEP Texas Inc. [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		100		100		100
Restricted Cash		29,400		29,400		34,000
Total Cash, Cash Equivalents and Restricted Cash		29,500	30,800	29,500	30,800	34,100	32,800
Cash Paid for Interest, Net of Capitalized Amounts				111,000	108,300
Net Cash Paid (Received) for Income Taxes				(5,400)	700
Increase (Decrease) in Accounts Payable				26,000	1,900
Net Cash Provided by (Used in) Operating Activities				386,100	227,000
Net Cash Provided by (Used in) Investing Activities				(883,600)	(814,000)
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				96,900	82,800
Net Cash Paid (Received) for Income Taxes				(12,500)	32,000
Increase (Decrease) in Accounts Payable				(6,500)	64,600
Net Cash Provided by (Used in) Operating Activities				573,100	482,900
Net Cash Provided by (Used in) Investing Activities				(854,600)	(948,500)
Appalachian Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		4,000		4,000		5,000
Restricted Cash		15,900		15,900		14,900
Total Cash, Cash Equivalents and Restricted Cash		19,900	21,900	19,900	21,900	19,900	21,900
Cash Paid for Interest, Net of Capitalized Amounts				126,600	125,900
Net Cash Paid (Received) for Income Taxes				9,600	23,400
Increase (Decrease) in Accounts Payable				66,400	(128,700)
Net Cash Provided by (Used in) Operating Activities				610,800	282,900
Net Cash Provided by (Used in) Investing Activities				(458,000)	(554,600)
Indiana Michigan Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		2,400	3,800	2,400	3,800	2,100	4,200
Cash Paid for Interest, Net of Capitalized Amounts				72,800	62,100
Net Cash Paid (Received) for Income Taxes				(14,500)	13,800
Acquisition Of Nuclear Fuel Included In Current Liabilities				8,200	36,000
Increase (Decrease) in Accounts Payable				(7,500)	(25,200)
Net Cash Provided by (Used in) Operating Activities				426,300	429,700
Payments for Nuclear Fuel				(69,800)	(1,900)
Net Cash Provided by (Used in) Investing Activities				(374,100)	(310,200)
Indiana Michigan Power Co [Member] | Revision of Prior Period, Adjustment
Cash, Cash Equivalents and Restricted Cash
Acquisition Of Nuclear Fuel Included In Current Liabilities					72,000
Increase (Decrease) in Accounts Payable					(72,000)
Net Cash Provided by (Used in) Operating Activities					(72,000)
Payments for Nuclear Fuel					(72,000)
Net Cash Provided by (Used in) Investing Activities					72,000
Indiana Michigan Power Co [Member] | Previously Reported
Cash, Cash Equivalents and Restricted Cash
Acquisition Of Nuclear Fuel Included In Current Liabilities					(36,000)
Increase (Decrease) in Accounts Payable					46,800
Net Cash Provided by (Used in) Operating Activities					501,700
Payments for Nuclear Fuel					73,900
Net Cash Provided by (Used in) Investing Activities					(382,200)
Ohio Power Co [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		6,300		6,300		6,400
Total Cash, Cash Equivalents and Restricted Cash		6,300	9,700	6,300	9,700	6,400	9,600
Cash Paid for Interest, Net of Capitalized Amounts				64,600	57,600
Net Cash Paid (Received) for Income Taxes				(13,000)	9,200
Increase (Decrease) in Accounts Payable				(47,200)	30,800
Net Cash Provided by (Used in) Operating Activities				256,400	69,600
Net Cash Provided by (Used in) Investing Activities				(490,400)	(536,600)
Public Service Co Of Oklahoma [Member]
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		2,500	4,600	2,500	4,600	2,500	4,000
Cash Paid for Interest, Net of Capitalized Amounts				51,600	37,600
Net Cash Paid (Received) for Income Taxes				(3,000)	(6,100)
Increase (Decrease) in Accounts Payable				109,800	75,200
Net Cash Provided by (Used in) Operating Activities				136,800	256,800
Net Cash Provided by (Used in) Investing Activities				(273,000)	(408,200)
Southwestern Electric Power Co [Member]
Amounts Attributable to AEP Common Shareholders
Earnings Attributable to Common Shareholders		(70,100)	81,000	138,000	121,600
Cash, Cash Equivalents and Restricted Cash
Cash and Cash Equivalents		$ 2,400	$ 4,600	2,400	4,600	$ 2,400	$ 88,400
Cash Paid for Interest, Net of Capitalized Amounts				71,600	48,700
Net Cash Paid (Received) for Income Taxes				14,900	(17,100)
Increase (Decrease) in Accounts Payable				60,200	81,200
Net Cash Provided by (Used in) Operating Activities				310,900	384,700
Net Cash Provided by (Used in) Investing Activities				$ (347,400)	$ (428,900)
Restricted Stock Units and Performance Share Units [Member]
Weighted Average Dilutive Effect of:
Weighted Average Dilutive Effect of Shares		1,200,000	1,300,000	1,200,000	1,400,000
Dilutive Securities, Effect on Basic Earnings Per Share		$ 0	$ 0	$ (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.