Financing Activities (Details) - USD ($)		1 Months Ended		12 Months Ended
		Feb. 26, 2024	Jan. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021		Dec. 31, 2020
Shares of Company
Beginning Balance, Shares			527,369,157	525,099,321	524,416,175	516,808,354
Issued				2,269,836	683,146	7,607,821
Ending Balance, Shares				527,369,157	525,099,321	524,416,175
Partners' Capital Account, Units, Treasury Units Reissued	[1]			(10,048,668)	(8,970,920)
Long-term Debt
Senior Unsecured Notes				$ 33,779,400,000	$ 30,174,800,000
Pollution Control Bonds	[2]			1,771,600,000	1,770,200,000
Notes Payable	[3]			193,300,000	269,700,000
Securitization Bonds				368,900,000	487,800,000
Spent Nuclear Fuel Obligation	[4]			300,400,000	285,600,000
Junior Subordinated Notes	[5]			2,388,100,000	2,381,300,000
Other Long-term Debt				1,341,500,000	1,431,600,000
Total Long-term Debt Outstanding				40,143,200,000	36,801,000,000
Outstanding Long-term Debt
Principal Amount, 2024				2,490,500,000
Principal Amount, 2025				3,308,500,000
Principal Amount, 2026				1,780,500,000
Principal Amount, 2027				2,215,900,000
Principal Amount, 2028				2,326,600,000
Principal Amount, After 2028				28,349,700,000
Principal Amount, Total				40,471,700,000
Unamortized Discount, Net and Debt Issuance Costs				(328,500,000)
Total Long-term Debt Outstanding				40,143,200,000	36,801,000,000
Short-term Debt
Securitized Debt for Receivables	[6]			888,000,000.0	750,000,000.0
Commercial Paper				1,937,900,000	2,862,200,000
Total Short-term Debt				$ 2,830,200,000	$ 4,112,200,000
Securitized Debt for Receivables	[6],[7]			5.65%	4.67%
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable				5.33%	1.84%	0.19%
Net Uncollectible Accounts Receivable Written Off				$ 30,700,000	$ 29,500,000	$ 26,500,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts				1,207,400,000	1,167,700,000
Delinquent Securitized Accounts Receivable				52,200,000	44,200,000
Bad Debt Reserves Related to Securitized Sale of Accounts Receivable				42,000,000.0	39,700,000
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable				409,800,000	360,900,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				18,982,300,000	19,639,500,000	16,792,000,000
Financing Activities (Textuals)
Repayments of Long-term Debt				2,196,100,000	2,345,400,000	2,989,300,000
Proceeds from Issuance of Long-term Debt				5,462,800,000	4,649,700,000	6,486,300,000
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31,				$ 37,300,000	56,400,000	47,800,000
Maximum Percentage Debt to Capitalization				67.50%
Restricted Net Assets				$ 16,600,000,000
Dividend Restrictions	[8]			3,003,400,000
Retained Earnings Available to Pay Dividends				7,600,000,000
Dividends Paid on Common Stock				1,760,400,000	1,645,200,000	1,519,500,000
Credit Facilities, Total				5,000,000,000
Maximum Value of Shares to be Issued Under ATM Program				$ 1,700,000,000
Maximum Percentage Paid to Selling Agents				2.00%
Issuance of Common Stock, Net				$ 999,600,000	$ 826,500,000	$ 600,500,000
Commitment From Bank Conduits to Finance Receivables (One) [Domain]				750,000,000
Total Commitment From Bank Conduits To Finance Receivables				$ 900,000,000
Treasury Stock, Common, Shares				1,184,572	11,233,240	20,204,160		20,204,160
Interest Expense				$ 1,806,900,000	$ 1,396,100,000	$ 1,199,100,000
2020 Equity Units [Member]
Shares of Company
Issued				10,048,668
Financing Activities (Textuals)
Equity Units Issued				17,000,000
Per Unit Conversion for Equity Units				$ 50
Net Equity Units Issuance Proceeds				833,000,000
Principal Amounts of Junior Subordinated Debt				$ 1,000
Forward Equity Purchase Contract Date				2023
Corporate unit ownership share of an equity unit				5.00%
Issuance of Common Stock, Net				$ 850,000,000
Commercial Paper [Member]
Short-term Debt
Debt, Weighted Average Interest Rate	[7]			5.69%	4.80%
Financing Activities (Textuals)
Weighted Average Interest Rate of Commercial Paper Outstanding During Year				5.38%
Maximum Amount of Commercial Paper Outstanding				$ 3,200,000,000
Term Loan 1
Short-term Debt
Debt, Weighted Average Interest Rate	[7]			0.00%	5.17%
Advances From Affiliates				$ 0	$ 125,000,000.0
Term Loan 2
Short-term Debt
Debt, Weighted Average Interest Rate	[7]			0.00%	5.17%
Advances From Affiliates				$ 0	$ 150,000,000.0
Term Loan 3
Short-term Debt
Debt, Weighted Average Interest Rate	[7]			0.00%	5.23%
Advances From Affiliates				$ 0	$ 100,000,000.0
Term Loan 4
Short-term Debt
Debt, Weighted Average Interest Rate	[7]			0.00%	4.87%
Advances From Affiliates				$ 0	$ 125,000,000.0
Securitized Debt
Short-term Debt
Securitized Debt for Receivables				$ 900,000,000
Financing Activities (Textuals)
Weighted Average Interest Rate of Commercial Paper Outstanding During Year				5.33%
AEP Texas Inc. [Member]
Long-term Debt
Senior Unsecured Notes				$ 5,027,200,000	4,702,700,000
Pollution Control Bonds				440,300,000	440,200,000
Securitization Bonds				221,800,000	314,400,000
Other Long-term Debt				200,500,000	200,500,000
Total Long-term Debt Outstanding				5,889,800,000	5,657,800,000
Outstanding Long-term Debt
Principal Amount, 2024				96,000,000.0
Principal Amount, 2025				524,500,000
Principal Amount, 2026				75,000,000.0
Principal Amount, 2027				25,600,000
Principal Amount, 2028				526,200,000
Principal Amount, After 2028				4,690,200,000
Principal Amount, Total				5,937,500,000
Unamortized Discount, Net and Debt Issuance Costs				(47,700,000)
Total Long-term Debt Outstanding				5,889,800,000	5,657,800,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				1,906,100,000	1,848,000,000	1,587,700,000
Financing Activities (Textuals)
Repayments of Long-term Debt				278,500,000	716,000,000.0	88,700,000
Proceeds from Issuance of Long-term Debt				$ 505,400,000	1,188,600,000	444,200,000
Maximum Percentage Debt to Capitalization				67.50%
Dividend Restrictions				$ 737,100,000
Interest Expense				232,700,000	208,700,000	$ 176,500,000
AEP Texas Inc. [Member] | Utility [Member]
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Money Pool				477,500,000	348,800,000
Maximum Loans to Money Pool				42,000,000.0	652,300,000
Average Borrowings from Money Pool				216,800,000	173,300,000
Average Loans to Money Pool				12,900,000	247,800,000
Authorized Short Term Borrowing Limit				$ 600,000,000.0	$ 500,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate				5.81%	5.28%	0.48%
Minimum Interest Rate				4.66%	0.10%	0.02%
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.46%	1.08%	0.33%
Average Interest Rate For Funds Loaned				5.71%	1.99%	0.26%
AEP Texas Inc. [Member] | Utility [Member] | Related Party
Short-term Debt
Advances From Affiliates				$ (103,700,000)	$ (96,500,000)
AEP Texas Inc. [Member] | Utility [Member] | Nonutility [Member]
Financing Activities (Textuals)
Interest Income Earned on Advances to the Money Pool				100,000	2,600,000	$ 100,000
AEP Texas Inc. [Member] | Utility [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Interest Expense				$ 10,800,000	$ 900,000	$ 300,000
AEP Texas Inc. [Member] | Nonutility [Member]
Maximum Interest Rate For Funds Loaned				5.81%	5.28%	0.58%
Minimum Interest Rate for Funds Loaned				4.66%	0.46%	0.21%
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Loans to Money Pool				$ 7,100,000	$ 7,000,000.0
Average Loans to Money Pool				$ 6,900,000	$ 6,800,000
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool
Average Interest Rate For Funds Loaned				5.54%	2.23%	0.37%
AEP Texas Inc. [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Advances to Affiliates				$ 7,100,000	$ 6,900,000
AEP Transmission Co [Member]
Long-term Debt
Senior Unsecured Notes				5,414,400,000	4,782,800,000
Total Long-term Debt Outstanding				5,414,400,000	4,782,800,000
Outstanding Long-term Debt
Principal Amount, 2024				95,000,000.0
Principal Amount, 2025				90,000,000.0
Principal Amount, 2026				425,000,000.0
Principal Amount, 2027				0
Principal Amount, 2028				60,000,000.0
Principal Amount, After 2028				4,806,000,000
Principal Amount, Total				5,476,000,000
Unamortized Discount, Net and Debt Issuance Costs				(61,600,000)
Total Long-term Debt Outstanding				5,414,400,000	4,782,800,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				1,720,600,000	1,651,700,000	$ 1,410,900,000
Financing Activities (Textuals)
Repayments of Long-term Debt				60,000,000.0	104,000,000.0	50,000,000.0
Proceeds from Issuance of Long-term Debt				689,000,000.0	540,800,000	443,700,000
Sub-Limit of Secured Debt				$ 50,000,000
Maximum Percentage of Consolidated Tangible Net Assets				10.00%
Tangible Capital to Tangible Assets				0.013
Maximum Percentage Debt to Capitalization				67.50%
Dividend Restrictions				$ 0
Interest Expense				194,500,000	162,700,000	$ 141,200,000
AEP Transmission Co [Member] | Utility [Member]
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Money Pool				471,300,000	480,200,000
Maximum Loans to Money Pool				309,400,000	137,000,000.0
Average Borrowings from Money Pool				135,600,000	189,400,000
Average Loans to Money Pool				70,500,000	28,900,000
Authorized Short Term Borrowing Limit	[9]			$ 820,000,000.0	$ 820,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate				5.81%	5.28%	0.48%
Minimum Interest Rate				4.66%	0.10%	0.02%
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.41%	1.81%	0.32%
Average Interest Rate For Funds Loaned				5.56%	2.47%	0.10%
AEP Transmission Co [Member] | Utility [Member] | Related Party
Short-term Debt
Advances From Affiliates				$ (62,800,000)	$ (195,500,000)
AEP Transmission Co [Member] | Utility [Member] | Direct Borrowing [Member]
Financing Activities (Textuals)
Interest Income Earned on Advances to the Money Pool				7,000,000.0	1,600,000	$ 400,000
AEP Transmission Co [Member] | Utility [Member] | Direct Borrowing [Member] | Related Party
Financing Activities (Textuals)
Interest Expense				$ 7,600,000	$ 3,500,000	$ 600,000
AEP Transmission Co [Member] | Direct Borrowing [Member]
Maximum Interest Rate for Funds Borrowed				5.81%	5.28%	0.86%
Minimum Interest Rate For Funds Borrowed				4.53%	0.46%	0.25%
Maximum Interest Rate For Funds Loaned				5.81%	5.28%	0.86%
Minimum Interest Rate for Funds Loaned				4.53%	0.46%	0.25%
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Money Pool				$ 44,400,000	$ 52,400,000
Maximum Loans to Money Pool				158,100,000	141,800,000
Average Borrowings from Money Pool				3,900,000	6,700,000
Average Loans to Money Pool				64,200,000	57,500,000
Borrowings from Parent				44,400,000	29,400,000
Loans to Parent				0	0
Authorized Short Term Borrowing Limit	[10]			$ 50,000,000.0	$ 50,000,000.0
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.56%	2.08%	0.38%
Average Interest Rate For Funds Loaned				5.51%	2.07%	0.35%
Appalachian Power Co [Member]
Long-term Debt
Senior Unsecured Notes				$ 4,584,900,000	$ 4,581,400,000
Pollution Control Bonds	[2]			430,000,000.0	429,400,000
Securitization Bonds				147,000,000.0	173,300,000
Other Long-term Debt				426,400,000	226,400,000
Total Long-term Debt Outstanding				5,588,300,000	5,410,500,000
Outstanding Long-term Debt
Principal Amount, 2024				538,800,000
Principal Amount, 2025				673,300,000
Principal Amount, 2026				30,900,000
Principal Amount, 2027				355,600,000
Principal Amount, 2028				31,800,000
Principal Amount, After 2028				4,000,000,000
Principal Amount, Total				5,630,400,000
Unamortized Discount, Net and Debt Issuance Costs				(42,100,000)
Total Long-term Debt Outstanding				5,588,300,000	5,410,500,000
Accounts Receivable and Accrued Unbilled Revenue
Accounts Receivable and Accrued Unbilled Revenues				184,600,000	194,400,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				3,740,600,000	3,520,700,000	$ 3,092,900,000
Proceeds on Sale of Receivables to AEP Credit
Proceeds from Sale of Receivables to AEP Credit				1,819,800,000	1,552,900,000	1,324,100,000
Financing Activities (Textuals)
Repayments of Long-term Debt				26,600,000	230,400,000	393,000,000.0
Proceeds from Issuance of Long-term Debt				$ 200,000,000.0	698,000,000.0	494,000,000.0
Maximum Percentage Debt to Capitalization				67.50%
Dividend Restrictions				$ 721,500,000
Interest Expense				269,600,000	233,900,000	214,000,000.0
Appalachian Power Co [Member] | Related Party
Short-term Debt
Advances From Affiliates				339,600,000	182,200,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				239,300,000	256,100,000	$ 197,900,000
Financing Activities (Textuals)
Advances to Affiliates				18,900,000	19,800,000
Appalachian Power Co [Member] | Utility [Member]
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Money Pool				388,600,000	438,400,000
Maximum Loans to Money Pool				19,800,000	214,200,000
Average Borrowings from Money Pool				283,500,000	181,700,000
Average Loans to Money Pool				19,000,000.0	45,400,000
Authorized Short Term Borrowing Limit				$ 750,000,000.0	$ 500,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate				5.81%	5.28%	0.48%
Minimum Interest Rate				4.66%	0.10%	0.02%
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.54%	2.34%	0.41%
Average Interest Rate For Funds Loaned				5.54%	2.39%	0.25%
Financing Activities (Textuals)
Interest Income Earned on Advances to the Money Pool				$ 1,100,000	$ 2,800,000	$ 300,000
Appalachian Power Co [Member] | Utility [Member] | Related Party
Short-term Debt
Advances From Affiliates				(320,700,000)	(162,400,000)
Financing Activities (Textuals)
Interest Expense				16,800,000	5,600,000	100,000
Indiana Michigan Power Co [Member]
Long-term Debt
Senior Unsecured Notes				2,843,600,000	2,597,300,000
Pollution Control Bonds	[2]			189,400,000	189,000,000.0
Notes Payable	[3]			163,300,000	183,800,000
Spent Nuclear Fuel Obligation	[4]			300,400,000	285,600,000
Other Long-term Debt				2,700,000	5,100,000
Total Long-term Debt Outstanding				3,499,400,000	3,260,800,000
Outstanding Long-term Debt
Principal Amount, 2024				83,700,000
Principal Amount, 2025				241,200,000
Principal Amount, 2026				26,300,000
Principal Amount, 2027				4,100,000
Principal Amount, 2028				350,800,000
Principal Amount, After 2028				2,825,400,000
Principal Amount, Total				3,531,500,000
Unamortized Discount, Net and Debt Issuance Costs				(32,100,000)
Total Long-term Debt Outstanding				3,499,400,000	3,260,800,000
Accounts Receivable and Accrued Unbilled Revenue
Accounts Receivable and Accrued Unbilled Revenues				156,400,000	166,900,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				2,522,300,000	2,659,700,000	2,330,700,000
Proceeds on Sale of Receivables to AEP Credit
Proceeds from Sale of Receivables to AEP Credit				2,054,800,000	2,045,600,000	1,927,000,000
Financing Activities (Textuals)
Repayments of Long-term Debt				343,300,000	83,400,000	383,500,000
Proceeds from Issuance of Long-term Debt				$ 565,300,000	142,700,000	546,700,000
Maximum Percentage Debt to Capitalization				67.50%
Dividend Restrictions				$ 702,600,000
Interest Expense				136,700,000	125,200,000	$ 116,800,000
Indiana Michigan Power Co [Member] | Utility [Member]
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Money Pool				475,300,000	318,600,000
Maximum Loans to Money Pool				112,200,000	23,000,000.0
Average Borrowings from Money Pool				84,000,000.0	105,200,000
Average Loans to Money Pool				44,200,000	22,300,000
Authorized Short Term Borrowing Limit				$ 500,000,000.0	$ 500,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate				5.81%	5.28%	0.48%
Minimum Interest Rate				4.66%	0.10%	0.02%
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.14%	2.57%	0.33%
Average Interest Rate For Funds Loaned				5.57%	2.20%	0.23%
Financing Activities (Textuals)
Interest Income Earned on Advances to the Money Pool				$ 2,400,000	$ 500,000	$ 200,000
Indiana Michigan Power Co [Member] | Utility [Member] | Related Party
Short-term Debt
Advances From Affiliates				(63,300,000)	(226,900,000)
Financing Activities (Textuals)
Interest Expense				3,200,000	2,900,000	200,000
Ohio Power Co [Member]
Long-term Debt
Senior Unsecured Notes				3,366,800,000	2,969,700,000
Other Long-term Debt				0	600,000
Total Long-term Debt Outstanding				3,366,800,000	2,970,300,000
Outstanding Long-term Debt
Principal Amount, 2024				0
Principal Amount, 2025				0
Principal Amount, 2026				0
Principal Amount, 2027				0
Principal Amount, 2028				0
Principal Amount, After 2028				3,400,000,000
Principal Amount, Total				3,400,000,000
Unamortized Discount, Net and Debt Issuance Costs				(33,200,000)
Total Long-term Debt Outstanding				3,366,800,000	2,970,300,000
Accounts Receivable and Accrued Unbilled Revenue
Accounts Receivable and Accrued Unbilled Revenues				541,700,000	478,600,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				3,802,800,000	3,672,100,000	2,837,500,000
Proceeds on Sale of Receivables to AEP Credit
Proceeds from Sale of Receivables to AEP Credit				3,339,300,000	3,101,300,000	2,458,500,000
Financing Activities (Textuals)
Repayments of Long-term Debt				600,000	100,000	500,100,000
Proceeds from Issuance of Long-term Debt				395,000,000.0	0	1,037,100,000
Dividend Restrictions				0
Interest Expense				130,900,000	119,600,000	$ 124,400,000
Ohio Power Co [Member] | Utility [Member]
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Money Pool				485,700,000	262,500,000
Maximum Loans to Money Pool				64,700,000	246,100,000
Average Borrowings from Money Pool				183,000,000.0	101,300,000
Average Loans to Money Pool				40,200,000	86,900,000
Authorized Short Term Borrowing Limit				$ 500,000,000.0	$ 500,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate				5.81%	5.28%	0.48%
Minimum Interest Rate				4.66%	0.10%	0.02%
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.43%	3.51%	0.27%
Average Interest Rate For Funds Loaned				5.60%	1.22%	0.14%
Financing Activities (Textuals)
Interest Income Earned on Advances to the Money Pool				$ 100,000	$ 400,000	$ 100,000
Ohio Power Co [Member] | Utility [Member] | Related Party
Short-term Debt
Advances From Affiliates				(110,500,000)	(172,900,000)
Financing Activities (Textuals)
Interest Expense				$ 9,700,000	$ 2,300,000	100,000
Public Service Co Of Oklahoma [Member]
Shares of Company
Beginning Balance, Shares			10,482,000	10,482,000
Ending Balance, Shares				10,482,000	10,482,000
Long-term Debt
Senior Unsecured Notes				$ 2,257,800,000	$ 1,785,600,000
Other Long-term Debt				126,800,000	127,200,000
Total Long-term Debt Outstanding				2,384,600,000	1,912,800,000
Outstanding Long-term Debt
Principal Amount, 2024				600,000
Principal Amount, 2025				250,600,000
Principal Amount, 2026				50,600,000
Principal Amount, 2027				300,000
Principal Amount, 2028				0
Principal Amount, After 2028				2,100,000,000
Principal Amount, Total				2,402,100,000
Unamortized Discount, Net and Debt Issuance Costs				(17,500,000)
Total Long-term Debt Outstanding				2,384,600,000	1,912,800,000
Accounts Receivable and Accrued Unbilled Revenue
Accounts Receivable and Accrued Unbilled Revenues				134,600,000	155,500,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				1,976,600,000	1,875,700,000	1,474,300,000
Proceeds on Sale of Receivables to AEP Credit
Proceeds from Sale of Receivables to AEP Credit				1,944,500,000	1,809,500,000	1,406,400,000
Financing Activities (Textuals)
Repayments of Long-term Debt				500,000	500,500,000	750,500,000
Proceeds from Issuance of Long-term Debt				$ 469,800,000	499,700,000	1,290,000,000
Maximum Percentage Debt to Capitalization				67.50%
Dividend Restrictions				$ 1,300,000
Interest Expense				103,600,000	83,800,000	$ 62,900,000
Public Service Co Of Oklahoma [Member] | Utility [Member]
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Money Pool				375,000,000.0	364,200,000
Maximum Loans to Money Pool				121,500,000	432,500,000
Average Borrowings from Money Pool				92,500,000	224,500,000
Average Loans to Money Pool				49,600,000	402,800,000
Authorized Short Term Borrowing Limit				$ 750,000,000.0	$ 400,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate				5.81%	5.28%	0.48%
Minimum Interest Rate				4.66%	0.10%	0.02%
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.51%	2.65%	0.34%
Average Interest Rate For Funds Loaned				5.35%	0.75%	0.07%
Financing Activities (Textuals)
Interest Income Earned on Advances to the Money Pool				$ 1,500,000	$ 300,000	$ 0
Public Service Co Of Oklahoma [Member] | Utility [Member] | Related Party
Short-term Debt
Advances From Affiliates				(54,400,000)	(364,200,000)
Financing Activities (Textuals)
Interest Expense				2,300,000	5,500,000	300,000
Southwestern Electric Power Co [Member]
Long-term Debt
Senior Unsecured Notes				3,646,900,000	3,297,600,000
Notes Payable	[3]			0	55,900,000
Other Long-term Debt				0	38,100,000
Total Long-term Debt Outstanding				3,646,900,000	3,391,600,000
Outstanding Long-term Debt
Principal Amount, 2024				0
Principal Amount, 2025				0
Principal Amount, 2026				900,000,000.0
Principal Amount, 2027				0
Principal Amount, 2028				575,000,000.0
Principal Amount, After 2028				2,200,000,000
Principal Amount, Total				3,675,000,000
Unamortized Discount, Net and Debt Issuance Costs				(28,100,000)
Total Long-term Debt Outstanding				3,646,900,000	3,391,600,000
Short-term Debt
Notes Payable				4,300,000	0
Accounts Receivable and Accrued Unbilled Revenue
Accounts Receivable and Accrued Unbilled Revenues				168,300,000	194,000,000.0
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				2,192,100,000	2,283,200,000	2,126,000,000
Proceeds on Sale of Receivables to AEP Credit
Proceeds from Sale of Receivables to AEP Credit				1,866,400,000	1,858,400,000	1,636,100,000
Financing Activities (Textuals)
Repayments of Long-term Debt				94,100,000	6,200,000	381,200,000
Proceeds from Issuance of Long-term Debt				$ 346,800,000	0	1,137,600,000
Maximum Percentage Debt to Capitalization				67.50%
Dividend Restrictions				$ 337,300,000
Dividends Paid on Common Stock				4,000,000.0	3,400,000	4,800,000
Interest Expense				147,200,000	137,400,000	125,900,000
Southwestern Electric Power Co [Member] | Related Party
Short-term Debt
Advances From Affiliates				88,700,000	310,700,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				81,600,000	59,500,000	$ 41,400,000
Financing Activities (Textuals)
Advances to Affiliates				2,200,000	2,100,000
Southwestern Electric Power Co [Member] | Utility [Member]
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Borrowings from Money Pool				401,600,000	358,400,000
Maximum Loans to Money Pool				25,800,000	156,600,000
Average Borrowings from Money Pool				150,700,000	219,300,000
Average Loans to Money Pool				16,500,000	109,700,000
Authorized Short Term Borrowing Limit				$ 750,000,000.0	$ 400,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate				5.81%	5.28%	0.48%
Minimum Interest Rate				4.66%	0.10%	0.02%
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.34%	2.80%	0.26%
Average Interest Rate For Funds Loaned				5.72%	0.55%	0.18%
Southwestern Electric Power Co [Member] | Utility [Member] | Related Party
Short-term Debt
Advances From Affiliates				$ (88,700,000)	$ (310,700,000)
Southwestern Electric Power Co [Member] | Utility [Member] | Nonutility [Member]
Financing Activities (Textuals)
Interest Income Earned on Advances to the Money Pool				200,000	200,000	$ 100,000
Southwestern Electric Power Co [Member] | Utility [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Interest Expense				$ 7,900,000	$ 4,900,000	$ 300,000
Southwestern Electric Power Co [Member] | Nonutility [Member]
Maximum Interest Rate For Funds Loaned				5.81%	5.28%	0.58%
Minimum Interest Rate for Funds Loaned				4.66%	0.46%	0.21%
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
Maximum Loans to Money Pool				$ 2,800,000	$ 2,100,000
Average Loans to Money Pool				$ 2,400,000	$ 2,100,000
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool
Average Interest Rate For Funds Loaned				5.56%	2.23%	0.37%
Southwestern Electric Power Co [Member] | Nonutility [Member] | Related Party
Financing Activities (Textuals)
Advances to Affiliates				$ 2,200,000	$ 2,100,000
Southwestern Electric Power Co [Member] | Loans Payable [Member]
Short-term Debt
Debt, Weighted Average Interest Rate	[7]			7.71%	0.00%
Senior Notes [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2024
Maturity Date High				2053
Weighted Average Interest Rate				4.23%
Senior Notes [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				1.00%	0.75%
Senior Notes [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				8.13%	8.13%
Senior Notes [Member] | AEP Texas Inc. [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2025
Maturity Date High				2052
Weighted Average Interest Rate				4.20%
Senior Notes [Member] | AEP Texas Inc. [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				2.10%	2.10%
Senior Notes [Member] | AEP Texas Inc. [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.76%	6.76%
Senior Notes [Member] | AEP Transmission Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2024
Maturity Date High				2053
Weighted Average Interest Rate				4.02%
Senior Notes [Member] | AEP Transmission Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				2.75%	2.75%
Senior Notes [Member] | AEP Transmission Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				5.52%	5.52%
Senior Notes [Member] | Appalachian Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2025
Maturity Date High				2050
Weighted Average Interest Rate				4.68%
Senior Notes [Member] | Appalachian Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				2.70%	2.70%
Senior Notes [Member] | Appalachian Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				7.00%	7.00%
Senior Notes [Member] | Indiana Michigan Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2028
Maturity Date High				2053
Weighted Average Interest Rate				4.52%
Senior Notes [Member] | Indiana Michigan Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				3.25%	3.20%
Senior Notes [Member] | Indiana Michigan Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.05%	6.05%
Senior Notes [Member] | Ohio Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2030
Maturity Date High				2051
Weighted Average Interest Rate				4.00%
Senior Notes [Member] | Ohio Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				1.63%	1.63%
Senior Notes [Member] | Ohio Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.60%	6.60%
Senior Notes [Member] | Public Service Co Of Oklahoma [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2025
Maturity Date High				2051
Weighted Average Interest Rate				4.05%
Senior Notes [Member] | Public Service Co Of Oklahoma [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				2.20%	2.20%
Senior Notes [Member] | Public Service Co Of Oklahoma [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.63%	6.63%
Senior Notes [Member] | Southwestern Electric Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2026
Maturity Date High				2051
Weighted Average Interest Rate				3.73%
Senior Notes [Member] | Southwestern Electric Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				1.65%	1.65%
Senior Notes [Member] | Southwestern Electric Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.20%	6.20%
Pollution Control Bonds [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low	[11]			2024
Maturity Date High	[11]			2036
Weighted Average Interest Rate				2.98%
Pollution Control Bonds [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.63%	0.63%
Pollution Control Bonds [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				4.90%	4.55%
Pollution Control Bonds [Member] | AEP Texas Inc. [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low	[11]			2029
Maturity Date High	[11]			2030
Weighted Average Interest Rate				3.88%
Pollution Control Bonds [Member] | AEP Texas Inc. [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				2.60%	0.90%
Pollution Control Bonds [Member] | AEP Texas Inc. [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				4.55%	4.55%
Pollution Control Bonds [Member] | Appalachian Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low	[11]			2024
Maturity Date High	[11]			2036
Weighted Average Interest Rate				2.89%
Pollution Control Bonds [Member] | Appalachian Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.63%	0.63%
Pollution Control Bonds [Member] | Appalachian Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				4.90%	3.80%
Pollution Control Bonds [Member] | Indiana Michigan Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low	[11]			2025
Maturity Date High	[11]			2025
Weighted Average Interest Rate				2.49%
Pollution Control Bonds [Member] | Indiana Michigan Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.75%	0.75%
Pollution Control Bonds [Member] | Indiana Michigan Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				3.05%	3.05%
Notes Payable, Other Payables [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2024
Maturity Date High				2028
Weighted Average Interest Rate				4.67%
Notes Payable, Other Payables [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.93%	0.93%
Notes Payable, Other Payables [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.59%	6.37%
Notes Payable, Other Payables [Member] | Indiana Michigan Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2024
Maturity Date High				2028
Weighted Average Interest Rate				5.08%
Notes Payable, Other Payables [Member] | Indiana Michigan Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.93%	0.93%
Notes Payable, Other Payables [Member] | Indiana Michigan Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.59%	5.93%
Notes Payable, Other Payables [Member] | Indiana Michigan Power Co [Member] | Subsequent Event [Member]
Financing Activities (Textuals)
Repayments of Long-term Debt		$ 8,000,000	$ 8,000,000
Notes Payable, Other Payables [Member] | Southwestern Electric Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Weighted Average Interest Rate				0.00%
Notes Payable, Other Payables [Member] | Southwestern Electric Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.00%	4.58%
Notes Payable, Other Payables [Member] | Southwestern Electric Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.00%	6.37%
Securitization Bonds [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low	[12]			2024
Maturity Date High	[12]			2029
Weighted Average Interest Rate				2.97%
Securitization Bonds [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				2.06%	2.01%
Securitization Bonds [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				3.77%	3.77%
Securitization Bonds [Member] | AEP Texas Inc. [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low	[12]			2024
Maturity Date High	[12]			2029
Weighted Average Interest Rate				2.43%
Securitization Bonds [Member] | AEP Texas Inc. [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				2.06%	2.06%
Securitization Bonds [Member] | AEP Texas Inc. [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				2.84%	2.84%
Securitization Bonds [Member] | AEP Texas Inc. [Member] | Subsequent Event [Member]
Financing Activities (Textuals)
Repayments of Long-term Debt		12,000,000
Securitization Bonds [Member] | Appalachian Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low	[12]			2028
Maturity Date High	[12]			2028
Weighted Average Interest Rate				3.77%
Securitization Bonds [Member] | Appalachian Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				3.77%	2.01%
Securitization Bonds [Member] | Appalachian Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				3.77%	3.77%
Securitization Bonds [Member] | Appalachian Power Co [Member] | Subsequent Event [Member]
Financing Activities (Textuals)
Repayments of Long-term Debt		13,000,000
Junior Subordinated Notes [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2024
Maturity Date High				2027
Weighted Average Interest Rate				3.90%
Junior Subordinated Notes [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
Proceeds from Issuance of Debt				$ 850,000,000
Junior Subordinated Notes [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				2.03%	1.30%
Junior Subordinated Notes [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				5.70%	3.88%
Other Long Term Debt [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2024
Maturity Date High				2059
Weighted Average Interest Rate				6.58%
Other Long Term Debt [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				3.00%	1.15%
Other Long Term Debt [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				13.72%	13.72%
Other Long Term Debt [Member] | AEP Texas Inc. [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2025
Maturity Date High				2059
Weighted Average Interest Rate				6.70%
Other Long Term Debt [Member] | AEP Texas Inc. [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				4.50%	4.50%
Other Long Term Debt [Member] | AEP Texas Inc. [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.71%	5.67%
Other Long Term Debt [Member] | Appalachian Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2024
Maturity Date High				2026
Weighted Average Interest Rate				6.53%
Other Long Term Debt [Member] | Appalachian Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.46%	4.84%
Other Long Term Debt [Member] | Appalachian Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				13.72%	13.72%
Other Long Term Debt [Member] | Indiana Michigan Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2025
Maturity Date High				2025
Weighted Average Interest Rate				6.00%
Other Long Term Debt [Member] | Indiana Michigan Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.00%	6.00%
Other Long Term Debt [Member] | Indiana Michigan Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.00%	6.00%
Other Long Term Debt [Member] | Ohio Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Weighted Average Interest Rate				0.00%
Other Long Term Debt [Member] | Ohio Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.00%	1.15%
Other Long Term Debt [Member] | Ohio Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.00%	1.15%
Other Long Term Debt [Member] | Public Service Co Of Oklahoma [Member]
Long- term Debt by Type of Debt and Maturity
Maturity Date Low				2025
Maturity Date High				2027
Weighted Average Interest Rate				6.65%
Other Long Term Debt [Member] | Public Service Co Of Oklahoma [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				3.00%	3.00%
Other Long Term Debt [Member] | Public Service Co Of Oklahoma [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				6.71%	5.75%
Other Long Term Debt [Member] | Southwestern Electric Power Co [Member]
Long- term Debt by Type of Debt and Maturity
Weighted Average Interest Rate				0.00%
Other Long Term Debt [Member] | Southwestern Electric Power Co [Member] | Minimum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.00%	4.68%
Other Long Term Debt [Member] | Southwestern Electric Power Co [Member] | Maximum [Member]
Long- term Debt by Type of Debt and Maturity
Interest Rate				0.00%	4.68%
Other Long Term Debt [Member] | Transource Energy [Member] | Subsequent Event [Member]
Financing Activities (Textuals)
Proceeds from Issuance of Long-term Debt		$ 2,000,000	$ 16,000,000
Junior Subordinated Debt [Member]
Financing Activities (Textuals)
Debt Instrument, Interest Rate, Stated Percentage				5.699%
Junior Subordinated Debt [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
Debt Instrument, Interest Rate, Stated Percentage				1.30%
Servicing Contracts [Member] | Appalachian Power Co [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				$ 16,900,000	$ 9,400,000	$ 4,900,000	[13]
Servicing Contracts [Member] | Indiana Michigan Power Co [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				16,300,000	9,700,000	7,000,000.0	[13]
Servicing Contracts [Member] | Ohio Power Co [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				29,500,000	29,800,000	8,300,000	[13]
Servicing Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				15,300,000	7,400,000	3,400,000	[13]
Servicing Contracts [Member] | Southwestern Electric Power Co [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Revenue from Contract with Customers				18,500,000	9,400,000	5,400,000	[13]
Retained Earnings [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31,				(1,000,000.0)		(1,100,000)
Dividends Paid on Common Stock				(1,800,000,000)	(1,600,000,000)	(1,500,000,000)
Additional Paid-in Capital [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31,				$ 38,100,000	$ 56,300,000	$ 32,600,000

[1] Reissued Treasury Stock used to fulfill share commitments related to AEP’s Equity Units. See “Equity Units” section below for additional information.

[2] For certain series of Pollution Control Bonds, interest rates are subject to periodic adjustment.  Certain series may be purchased on demand at periodic interest adjustment dates.  Letters of credit from banks and insurance policies support certain series. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year - Nonaffiliated on the balance sheets.

[3] Notes payable represent outstanding promissory notes issued under term loan agreements and credit agreements with a number of banks and other financial institutions. At expiration, all notes then issued and outstanding are due and payable. Interest rates are both fixed and variable. Variable rates generally relate to specified short-term interest rates.

[4] Spent Nuclear Fuel Obligation consists of a liability along with accrued interest for disposal of SNF. See “Spent Nuclear Fuel Disposal” section of Note 6 for additional information.

[5] See “Equity Units” section below for additional information.

[6] Amount of securitized debt for receivables as accounted for under the “Transfers and Servicing” accounting guidance.

[7] Weighted-average rate as of December 31, 2023 and 2022, respectively.

[8] Includes the restrictions of consolidated and non-consolidated subsidiaries.

[9] (a)    Amount represents the combined authorized short-term borrowing limit the State Transcos have from FERC or state regulatory commissions.

[10] Amount represents the authorized short-term borrowing limit from FERC or state regulatory agencies not otherwise included in the utility money pool above.

[11] Certain Pollution Control Bonds are subject to redemption earlier than the maturity date.

[12] Dates represent the scheduled final payment dates for the securitization bonds. The legal maturity date is one to two years later. These bonds have been classified for maturity and repayment purposes based on the scheduled final payment date.

[13] In 2021, due to the successful collection of accounts receivable balances during the COVID-19 pandemic, the allowance for doubtful accounts was reduced, resulting in the issuance of credits to offset the higher fees previously paid and to lower subsequent fees paid.