Financing Activities (Details) - USD ($)			1 Months Ended	3 Months Ended
		Mar. 15, 2023	Apr. 30, 2023	Mar. 31, 2023		Mar. 31, 2022		Dec. 31, 2022
Long-term Debt
Senior Unsecured Notes				$ 32,654,300,000				$ 30,174,800,000
Pollution Control Bonds				1,770,400,000				1,770,200,000
Notes Payable				190,000,000.0				269,700,000
Securitization Bonds				463,400,000				487,800,000
Spent Nuclear Fuel Obligation	[1]			288,800,000				285,600,000
Junior Subordinated Notes	[2]			2,383,300,000				2,381,300,000
Other Long-term Debt				1,394,000,000				1,431,600,000
Total Long-term Debt Outstanding				39,144,200,000				36,801,000,000
Long-term Debt Due Within One Year				2,905,100,000				2,486,400,000
Long-term Debt				36,239,100,000				34,314,600,000
Liabilities Held for Sale				67,200,000				0
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]			2,876,000,000
Repayments of Long-term Debt				519,500,000		$ 51,000,000.0
Short-term Debt:
Securitized Debt for Receivables	[4]			750,000,000.0				750,000,000.0
Commercial Paper				1,981,100,000				2,862,200,000
Total Short-term Debt				$ 3,622,100,000				$ 4,112,200,000
Securitized Debt for Receivables	[4],[5]			5.05%				4.67%
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable				4.86%		0.31%
Net Uncollectible Accounts Receivable Written Off				$ 6,900,000		$ 7,400,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts				1,091,800,000				$ 1,167,700,000
Total Principal Outstanding				750,000,000.0				750,000,000.0
Delinquent Securitized Accounts Receivable				49,300,000				44,200,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable				41,200,000				39,700,000
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable				287,300,000				360,900,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				4,690,900,000		4,592,600,000
Financing Activities (Textuals)
Maximum Value of Shares to be Issued Under ATM Program				$ 1,000,000,000
Maximum Percentage Paid to Selling Agents				2.00%
Issuance of Common Stock				$ 41,100,000		809,500,000
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition								330,000,000
Maximum Percentage Debt to Capitalization				67.50%
Total Commitment from Bank Conduits to Finance Receivables				$ 750,000,000
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,				12,500,000		16,700,000
Commitment from Bank Conduits to Finance Receivables				125,000,000
Commitment from Bank Conduits to Finance Receivables Two				625,000,000
Assets Held for Sale				1,396,300,000				$ 0
Issuance of Long-term Debt				2,847,300,000		499,600,000
Revenue from Related Parties				0		0
Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				327,200,000	[6]	312,900,000	[7]
Wholesale Transmission [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				450,100,000	[6]	414,500,000	[7]
Financing Activities (Textuals)
Revenue from Related Parties				357,000,000		327,000,000
Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				65,300,000	[8]	119,100,000	[9]
Other Revenues [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				3,600,000	[8]	(200,000)	[9]
Other Revenues [Member] | Corporate and Other
Financing Activities (Textuals)
Revenue from Related Parties				29,000,000
Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				215,200,000		227,500,000
Wholesale Generation [Member] | AEP Transmission Holdco [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				$ 0		0
2020 Equity Units [Member]
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
Equity Units Annual Distribution Rate				6.125%
Forward Equity Contract Payment Rate				4.825%
Maximum Shares Issued Under Equity Units Conversion				10,205,100
Corporate unit ownership share of an equity unit				5.00%
Junior Subordinated Debt [Member] | 2020 Equity Units [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt				$ 850,000,000
Interest Rate (Percentage)				1.30%
Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]			$ 850,000,000.0
Due Date				2033
Interest Rate (Percentage)				5.63%
Commercial Paper [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]			5.20%				4.80%
Term Loan [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]			5.64%				5.17%
Term Loan				$ 125,000,000.0				$ 125,000,000.0
Term Loan 2 [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]			5.63%				5.17%
Term Loan				$ 150,000,000.0				$ 150,000,000.0
Term Loan 3
Short-term Debt:
Weighted Average Interest Rate	[5]			5.67%				0.00%
Term Loan				$ 500,000,000.0				$ 0
Term Loan 4
Short-term Debt:
Weighted Average Interest Rate	[5]			5.64%				5.23%
Term Loan				$ 100,000,000.0				$ 100,000,000.0
Term Loan 5
Short-term Debt:
Weighted Average Interest Rate	[5]			0.00%				4.87%
Term Loan				$ 0				$ 125,000,000.0
AEP Texas Inc. [Member]
Long-term Debt
Total Long-term Debt Outstanding				5,522,000,000				5,657,800,000
Long-term Debt Due Within One Year				153,700,000				278,500,000
Long-term Debt				5,368,300,000				5,379,300,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 136,700,000		11,400,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization				67.50%
Revenue from Related Parties				$ 1,200,000		900,000
AEP Texas Inc. [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				146,300,000	[10]	133,100,000	[11]
AEP Texas Inc. [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				9,700,000	[12]	9,300,000	[13]
AEP Texas Inc. [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				$ 0	[14]	$ 0	[15]
AEP Texas Inc. [Member] | Utility [Member]
Maximum Interest Rate				5.42%		1.00%
Minimum Interest Rate				4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool				$ 453,700,000
Maximum Loans to Money Pool				0
Average Borrowings from Money Pool				285,300,000
Average Loans to Money Pool				0
Net Loans (Borrowings) to/from Money Pool				(450,800,000)
Authorized Short Term Borrowing Limit				$ 500,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.18%		0.70%
Average Interest Rate For Funds Loaned				0.00%		0.00%
AEP Texas Inc. [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool				$ 6,900,000
Average Loans to Money Pool				6,800,000
Net Loans (Borrowings) to/from Money Pool				$ 6,800,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned				5.42%		1.00%
Minimum Interest Rate for Funds Loaned				4.66%		0.46%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned				5.12%		0.62%
AEP Texas Inc. [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 11,700,000
Due Date				2025
Interest Rate (Percentage)				2.06%
AEP Texas Inc. [Member] | Senior Unsecured Notes Six
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 125,000,000.0
Due Date				2023
Interest Rate (Percentage)				3.09%
AEP Transmission Co [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 5,472,100,000				4,782,800,000
Long-term Debt Due Within One Year				60,000,000.0				60,000,000.0
Long-term Debt				5,412,100,000				4,722,800,000
Financing Activities (Textuals)
Sub-Limit of Secured Debt				$ 50,000,000
Maximum Percentage of Consolidated Tangible Net Assets				10.00%
Tangible Capital to Tangible Assets				0.00%
Maximum Percentage Debt to Capitalization				67.50%
Issuance of Long-term Debt				$ 689,200,000		$ 0
Revenue from Related Parties				357,400,000		325,000,000.0
AEP Transmission Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				438,700,000	[10]	400,300,000	[11]
Financing Activities (Textuals)
Revenue from Related Parties				349,000,000		323,000,000
AEP Transmission Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				3,700,000	[12]	(300,000)	[13]
AEP Transmission Co [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				$ 0	[14]	$ 0	[15]
AEP Transmission Co [Member] | Utility [Member]
Maximum Interest Rate				5.42%		1.00%
Minimum Interest Rate				4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool				$ 471,300,000
Maximum Loans to Money Pool				309,400,000
Average Borrowings from Money Pool				272,900,000
Average Loans to Money Pool				45,700,000
Net Loans (Borrowings) to/from Money Pool				260,500,000
Authorized Short Term Borrowing Limit	[16]			$ 820,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.09%		0.66%
Average Interest Rate For Funds Loaned				5.29%		0.60%
AEP Transmission Co [Member] | Direct Borrowing [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool				$ 29,400,000
Maximum Loans to Money Pool				158,100,000
Average Borrowings from Money Pool				3,100,000
Average Loans to Money Pool				80,200,000
Borrowings from Parent				1,600,000
Loans to Parent				34,200,000
Authorized Short Term Borrowing Limit	[17]			$ 50,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate for Funds Borrowed				5.38%		1.00%
Minimum Interest Rate For Funds Borrowed				4.53%		0.46%
Maximum Interest Rate For Funds Loaned				5.38%		1.00%
Minimum Interest Rate for Funds Loaned				4.53%		0.46%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.03%		0.66%
Average Interest Rate For Funds Loaned				5.15%		0.60%
AEP Transmission Co [Member] | Senior Unsecured Notes Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]			$ 700,000,000.0
Due Date				2053
Interest Rate (Percentage)				5.40%
Appalachian Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 5,398,700,000				5,410,500,000
Long-term Debt Due Within One Year				252,300,000				251,800,000
Long-term Debt				5,146,400,000				5,158,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				13,000,000.0		$ 12,700,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues				195,500,000				194,400,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit				$ 506,200,000		415,500,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization				67.50%
Revenue from Related Parties				$ 69,600,000		56,900,000
Appalachian Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				41,400,000	[10]	41,100,000	[11]
Appalachian Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				13,000,000.0	[12]	24,300,000	[13]
Appalachian Power Co [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				80,200,000	[14]	56,200,000	[15]
Financing Activities (Textuals)
Revenue from Related Parties				47,000,000		36,000,000
Appalachian Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				$ 4,900,000		$ 1,300,000
Appalachian Power Co [Member] | Utility [Member]
Maximum Interest Rate				5.42%		1.00%
Minimum Interest Rate				4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool				$ 373,600,000
Maximum Loans to Money Pool				19,800,000
Average Borrowings from Money Pool				285,300,000
Average Loans to Money Pool				18,900,000
Net Loans (Borrowings) to/from Money Pool				(291,500,000)
Authorized Short Term Borrowing Limit				$ 500,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.14%		0.55%
Average Interest Rate For Funds Loaned				5.12%		0.62%
Appalachian Power Co [Member] | Securitization Bonds Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 9,700,000
Due Date				2023
Interest Rate (Percentage)				2.01%
Appalachian Power Co [Member] | Securitization Bonds Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 3,300,000
Due Date				2028
Interest Rate (Percentage)				3.77%
Indiana Michigan Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 3,489,000,000				3,260,800,000
Long-term Debt Due Within One Year				86,000,000.0				341,800,000
Long-term Debt				3,403,000,000				2,919,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				274,300,000		$ 23,800,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues				167,900,000				166,900,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit				525,400,000		513,400,000
Financing Activities (Textuals)
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition				$ 335,000,000				330,000,000
Maximum Percentage Debt to Capitalization				67.50%
Issuance of Long-term Debt				$ 499,800,000		0
Revenue from Related Parties				1,200,000		2,000,000.0
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				8,100,000	[10]	8,800,000	[11]
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				21,400,000	[12]	29,900,000	[13]
Financing Activities (Textuals)
Revenue from Related Parties				18,000,000
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				104,000,000.0	[14]	90,400,000	[15]
Indiana Michigan Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				$ 3,900,000		$ 1,700,000
Indiana Michigan Power Co [Member] | Utility [Member]
Maximum Interest Rate				5.42%		1.00%
Minimum Interest Rate				4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool				$ 475,300,000
Maximum Loans to Money Pool				82,900,000
Average Borrowings from Money Pool				212,500,000
Average Loans to Money Pool				28,100,000
Net Loans (Borrowings) to/from Money Pool				60,000,000.0
Authorized Short Term Borrowing Limit				$ 500,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.12%		0.63%
Average Interest Rate For Funds Loaned				5.16%		0.62%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Four [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 3,900,000
Due Date				2025
Interest Rate (Percentage)				0.93%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Five [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 6,800,000
Due Date				2026
Interest Rate (Percentage)				3.44%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Six [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 6,700,000
Due Date				2027
Interest Rate (Percentage)				5.93%
Indiana Michigan Power Co [Member] | Other Long Term Debt Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 500,000
Due Date				2025
Interest Rate (Percentage)				6.00%
Indiana Michigan Power Co [Member] | Senior Unsecured Notes Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]			$ 500,000,000.0
Due Date				2053
Interest Rate (Percentage)				5.63%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 600,000
Due Date				2023
Interest Rate (Variable)				Variable
Indiana Michigan Power Co [Member] | Senior Unsecured Notes Seven
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 250,000,000.0
Due Date				2023
Interest Rate (Percentage)				3.20%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 1,200,000
Due Date				2024
Interest Rate (Variable)				Variable
Indiana Michigan Power Co [Member] | Notes Payable, Other Payables [Member] | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 8,000,000
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Three [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 4,600,000
Due Date				2025
Interest Rate (Variable)				Variable
Ohio Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 2,970,800,000				2,970,300,000
Long-term Debt Due Within One Year				100,000				100,000
Long-term Debt				2,970,700,000				2,970,200,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues				457,500,000				478,600,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit				884,400,000		$ 716,600,000
Financing Activities (Textuals)
Revenue from Related Parties				7,600,000		3,700,000
Ohio Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				17,900,000	[10]	21,800,000	[11]
Ohio Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				33,200,000	[12]	44,600,000	[13]
Ohio Power Co [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				0	[14]	0	[15]
Ohio Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				$ 7,300,000		$ 7,400,000
Ohio Power Co [Member] | Utility [Member]
Maximum Interest Rate				5.42%		1.00%
Minimum Interest Rate				4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool				$ 483,000,000.0
Maximum Loans to Money Pool				0
Average Borrowings from Money Pool				292,600,000
Average Loans to Money Pool				0
Net Loans (Borrowings) to/from Money Pool				(414,600,000)
Authorized Short Term Borrowing Limit				$ 500,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.17%		0.77%
Average Interest Rate For Funds Loaned				0.00%		0.48%
Public Service Co Of Oklahoma [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 2,383,600,000				1,912,800,000
Long-term Debt Due Within One Year				500,000				500,000
Long-term Debt				2,383,100,000				1,912,300,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				100,000		$ 100,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues				134,200,000				155,500,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit				$ 416,300,000		363,400,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization				67.50%
Issuance of Long-term Debt				$ 469,900,000		500,000,000.0
Revenue from Related Parties				700,000		600,000
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				11,300,000	[10]	9,600,000	[11]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				2,300,000	[12]	5,400,000	[13]
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				900,000	[14]	9,500,000	[15]
Public Service Co Of Oklahoma [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				$ 3,200,000		$ 900,000
Public Service Co Of Oklahoma [Member] | Utility [Member]
Maximum Interest Rate				5.42%		1.00%
Minimum Interest Rate				4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool				$ 375,000,000.0
Maximum Loans to Money Pool				121,500,000
Average Borrowings from Money Pool				321,700,000
Average Loans to Money Pool				74,800,000
Net Loans (Borrowings) to/from Money Pool				(130,700,000)
Authorized Short Term Borrowing Limit				$ 400,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				4.84%		0.69%
Average Interest Rate For Funds Loaned				5.11%		0.65%
Public Service Co Of Oklahoma [Member] | OtherLongTermDebtThree
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 100,000
Due Date				2027
Interest Rate (Percentage)				3.00%
Public Service Co Of Oklahoma [Member] | Senior Unsecured Notes Four
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]			$ 475,000,000.0
Due Date				2033
Interest Rate (Percentage)				5.25%
Southwestern Electric Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding				$ 3,644,800,000				3,391,600,000
Long-term Debt Due Within One Year				0				6,200,000
Long-term Debt				3,644,800,000				3,385,400,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				94,100,000		$ 1,600,000
Short-term Debt:
Notes Payable				16,000,000.0				0
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues				157,800,000				$ 194,000,000.0
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit				$ 437,600,000		394,500,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization				67.50%
Issuance of Long-term Debt				$ 347,300,000		0
Revenue from Related Parties				11,700,000		10,000,000.0
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				42,900,000	[10]	35,200,000	[11]
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				7,900,000	[12]	5,300,000	[13]
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				39,600,000	[14]	61,200,000	[15]
Southwestern Electric Power Co [Member] | Servicing Contracts [Member]
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold				$ 4,300,000		$ 1,300,000
Southwestern Electric Power Co [Member] | Utility [Member]
Maximum Interest Rate				5.42%		1.00%
Minimum Interest Rate				4.66%		0.10%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool	[18]			$ 401,600,000
Maximum Loans to Money Pool				0
Average Borrowings from Money Pool				353,900,000
Average Loans to Money Pool				0
Net Loans (Borrowings) to/from Money Pool				(18,800,000)
Authorized Short Term Borrowing Limit				$ 400,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed				5.12%		0.98%
Average Interest Rate For Funds Loaned				0.00%		0.55%
Financing Activities (Textuals)
Amount Exceeding Maximum Borrowings from Money Pool		$ 1,600,000
Southwestern Electric Power Co [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool				$ 2,100,000
Average Loans to Money Pool				2,100,000
Net Loans (Borrowings) to/from Money Pool				$ 2,100,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned				5.42%		1.00%
Minimum Interest Rate for Funds Loaned				4.66%		0.46%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned				5.13%		0.62%
Southwestern Electric Power Co [Member] | Notes Payable, Other Payable Seven [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 25,000,000.0
Due Date				2024
Interest Rate (Percentage)				6.37%
Southwestern Electric Power Co [Member] | Notes Payable, Other Payable Eight [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 30,900,000
Due Date				2032
Interest Rate (Percentage)				4.58%
Southwestern Electric Power Co [Member] | OtherLongTermDebtFour
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 38,200,000
Due Date				2028
Interest Rate (Percentage)				4.68%
Southwestern Electric Power Co [Member] | Senior Unsecured Notes Five
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]			$ 350,000,000.0
Due Date				2033
Interest Rate (Percentage)				5.30%
Southwestern Electric Power Co [Member] | Loans Payable [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]			7.27%				0.00%
Transource Energy [Member] | Other Long Term Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]			$ 1,000,000.0
Due Date				2025
Interest Rate (Variable)				Variable
Transource Energy [Member] | Senior Unsecured Notes Eight
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt				$ 1,300,000
Due Date				2050
Interest Rate (Percentage)				2.75%
Maximum [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
AEP Share Price for Equity Unit Conversion				$ 99.95
Shares Per Equity Unit				0.5003
Minimum [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
AEP Share Price for Equity Unit Conversion				$ 83.29
Shares Per Equity Unit				0.6003
Additional Paid-in Capital [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,				$ 12,700,000		$ 15,200,000
Additional Paid-in Capital [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,				$ 121,000,000

[1] Pursuant to the Nuclear Waste Policy Act of 1982, I&M, a nuclear licensee, has an obligation to the United States Department of Energy for SNF disposal. The obligation includes a one-time fee for nuclear fuel consumed prior to April 7, 1983. Trust fund assets related to this obligation were $335 million and $330 million as of March 31, 2023 and December 31, 2022, respectively, and are included in Spent Nuclear Fuel and Decommissioning Trusts on the balance sheets.

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

[3] 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.

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

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

[6] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $357 million. The remaining affiliated amounts were immaterial.

[7] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $327 million. The remaining affiliated amounts were immaterial.

[8] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $29 million. The remaining affiliated amounts were immaterial.

[9] Amounts include affiliated and nonaffiliated revenues

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $349 million. The remaining affiliated amounts were immaterial.

[11] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $323 million. The remaining affiliated amounts were immaterial.

[12] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $18 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $10 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.

[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $47 million primarily related to the PPA with KGPCo.

[15] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $36 million primarily related to the PPA with KGPCo.

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

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

[18] SWEPCo’s maximum borrowings from the Utility Money Pool exceeded the authorized short-term borrowing limit by $1.6 million on March 15, 2023. On March 16, 2023, SWEPCo’s borrowings from the Utility Money Pool were reduced below the $400 million authorized limit and borrowings have continued to remain below the authorized limit.