Financing Activities (Details) - USD ($)		1 Months Ended	3 Months Ended								9 Months Ended
		Oct. 27, 2022	Sep. 30, 2022		Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021		Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022		Sep. 30, 2021		Dec. 31, 2021
Long-term Debt
Senior Unsecured Notes			$ 28,892,700,000								$ 28,892,700,000				$ 27,497,300,000
Pollution Control Bonds			1,804,900,000								1,804,900,000				1,804,500,000
Notes Payable			218,000,000.0								218,000,000.0				211,300,000
Securitization Bonds			524,800,000								524,800,000				603,500,000
Spent Nuclear Fuel Obligation	[1]		283,200,000								283,200,000				281,300,000
Junior Subordinated Notes	[2]		2,377,300,000								2,377,300,000				2,373,000,000
Other Long-term Debt			949,200,000								949,200,000				683,600,000
Total Long-term Debt Outstanding	[3]		35,050,100,000								35,050,100,000				33,454,500,000
Long-term Debt Due Within One Year	[4]		1,403,500,000								1,403,500,000				2,153,800,000
Long-term Debt	[5]		33,646,600,000								33,646,600,000				31,300,700,000
Liabilities Held for Sale			1,992,000,000								1,992,000,000				1,880,900,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										3,457,200,000
Repayments of Long-term Debt											1,679,100,000		$ 1,549,800,000
Short-term Debt:
Securitized Debt for Receivables	[7]		750,000,000.0								750,000,000.0				750,000,000.0
Commercial Paper			1,952,300,000								1,952,300,000				1,364,000,000
Total Short-term Debt			$ 2,702,300,000								$ 2,702,300,000				$ 2,614,000,000
Securitized Debt for Receivables	[7],[8]		1.16%								1.16%				0.19%
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable			2.25%				0.18%				1.16%		0.19%
Net Uncollectible Accounts Receivable Written Off			$ 9,500,000				$ 7,500,000				$ 23,100,000		$ 22,600,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts			1,172,500,000								1,172,500,000				$ 995,200,000
Total Principal Outstanding			750,000,000.0								750,000,000.0				750,000,000.0
Delinquent Securitized Accounts Receivable			57,400,000								57,400,000				57,900,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable			39,400,000								39,400,000				42,800,000
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable			252,300,000								252,300,000				307,100,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			5,526,100,000				4,623,000,000				14,758,400,000		12,730,600,000
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											$ 827,200,000		548,000,000.0
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition															329,000,000
Maximum Percentage Debt to Capitalization											67.50%
Total Commitment from Bank Conduits to Finance Receivables			750,000,000								$ 750,000,000
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,			(3,000,000.0)		$ (18,800,000)	$ 16,700,000	(7,800,000)		$ (10,500,000)	$ 19,100,000
Commitment from Bank Conduits to Finance Receivables			125,000,000								125,000,000
Commitment from Bank Conduits to Finance Receivables Two			625,000,000								625,000,000
Assets Held for Sale			2,830,600,000								2,830,600,000				$ 2,919,700,000
Issuance of Long-term Debt											3,428,400,000		5,062,300,000
Revenue from Related Parties			0				0				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			314,800,000	[9]			308,800,000	[10]			991,000,000.0	[11]	878,600,000	[12]
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			424,900,000	[9]			375,800,000	[10]			1,261,000,000	[11]	1,092,100,000	[12]
Financing Activities (Textuals)
Revenue from Related Parties			342,000,000				286,000,000				$ 1,000,000,000		835,000,000
2020 Equity Units [Member]
Financing Activities (Textuals)
Equity Units Issued											17,000,000
Per Unit Conversion for Equity Units			$ 50								$ 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%								6.125%
Forward Equity Contract Payment Rate			4.825%								4.825%
Maximum Shares Issued Under Equity Units Conversion											10,205,100
Corporate unit ownership share of an equity unit			5.00%								5.00%
2019 Equity Units [Member]
Financing Activities (Textuals)
Stock Issued During Period, Shares, New Issues											8,970,920
Issuance of Common Stock											$ 805,000,000
Equity Units Issued											16,100,000
Per Unit Conversion for Equity Units			$ 50								$ 50
Net Equity Units Issuance Proceeds											785,000,000
Principal Amounts of Junior Subordinated Debt											$ 1,000
Forward Equity Purchase Contract Date											2022
Corporate unit ownership share of an equity unit			5.00%								5.00%
Kentucky Transmission Company
Financing Activities (Textuals)
Assets Held for Sale			$ 5,000,000								$ 5,000,000
Junior Subordinated Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Interest Rate (Percentage)			2.031%								2.031%
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%								1.30%
Junior Subordinated Debt [Member] | 2019 Equity Units [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt											$ 805,000,000
Interest Rate (Percentage)			3.40%								3.40%
Commercial Paper [Member]
Short-term Debt:
Weighted Average Interest Rate	[8]		3.38%								3.38%				0.34%
Term Loan [Member]
Short-term Debt:
Weighted Average Interest Rate	[8]		0.00%								0.00%				0.81%
Term Loan			$ 0								$ 0				$ 500,000,000.0
AEP Texas Inc. [Member]
Long-term Debt
Total Long-term Debt Outstanding			5,693,900,000								5,693,900,000				5,180,800,000
Long-term Debt Due Within One Year			277,500,000								277,500,000				716,000,000.0
Long-term Debt			5,416,400,000								5,416,400,000				4,464,800,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 678,600,000		52,200,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 1,188,700,000		444,200,000
Revenue from Related Parties			900,000				900,000				2,600,000		2,900,000
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			140,800,000	[13]			131,500,000	[14]			$ 417,700,000	[15]	$ 364,500,000	[16]
AEP Texas Inc. [Member] | Utility [Member]
Maximum Interest Rate											3.39%		0.40%
Minimum Interest Rate											0.10%		0.02%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 348,800,000
Maximum Loans to Money Pool											652,300,000
Average Borrowings from Money Pool											208,100,000
Average Loans to Money Pool											319,800,000
Net Loans (Borrowings) to/from Money Pool			129,500,000								129,500,000
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											0.90%		0.33%
Average Interest Rate For Funds Loaned											1.82%		0.27%
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								$ 6,800,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned											3.39%		0.41%
Minimum Interest Rate for Funds Loaned											0.46%		0.21%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned											1.51%		0.34%
AEP Texas Inc. [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 30,600,000
Due Date											2024
Interest Rate (Percentage)			2.85%								2.85%
AEP Texas Inc. [Member] | Securitization Bonds Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 23,000,000.0
Due Date											2025
Interest Rate (Percentage)			2.06%								2.06%
AEP Texas Inc. [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 500,000,000.0
Due Date											2052
Interest Rate (Percentage)			5.25%								5.25%
AEP Texas Inc. [Member] | Senior Unsecured Notes Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 500,000,000.0
Due Date											2032
Interest Rate (Percentage)			4.70%								4.70%
AEP Texas Inc. [Member] | OtherLongTermDebtThree
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 200,000,000.0
Due Date											2025
Interest Rate (Variable)											Variable
AEP Texas Inc. [Member] | Other Long Term Debt Six
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 200,000,000.0
Due Date											2022
Interest Rate (Variable)											Variable
AEP Texas Inc. [Member] | Senior Unsecured Notes Five
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 400,000,000.0
Due Date											2022
Interest Rate (Percentage)			2.40%								2.40%
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											$ 25,000,000.0
Due Date											2022
Interest Rate (Percentage)			3.27%								3.27%
AEP Transmission Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 4,886,600,000								$ 4,886,600,000				4,343,900,000
Long-term Debt Due Within One Year			104,000,000.0								104,000,000.0				104,000,000.0
Long-term Debt			4,782,600,000								4,782,600,000				4,239,900,000
Liabilities Held for Sale			27,600,000								27,600,000				27,600,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold													$ 300,000
Financing Activities (Textuals)
Sub-Limit of Secured Debt			$ 50,000,000								$ 50,000,000
Maximum Percentage of Consolidated Tangible Net Assets			10.00%								10.00%
Tangible Capital to Tangible Assets			0.50%								0.50%
Maximum Percentage Debt to Capitalization											67.50%
Assets Held for Sale			$ 173,700,000								$ 173,700,000				167,900,000
Issuance of Long-term Debt											540,900,000		443,700,000
Revenue from Related Parties			340,600,000				297,700,000				999,500,000		882,300,000
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			411,700,000	[13]			360,100,000	[14]			1,218,100,000	[15]	1,045,200,000	[16]
Financing Activities (Textuals)
Revenue from Related Parties			339,000,000				281,000,000				$ 992,000,000		$ 823,000,000
AEP Transmission Co [Member] | Utility [Member]
Maximum Interest Rate											3.39%		0.40%
Minimum Interest Rate											0.10%		0.02%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 480,200,000
Maximum Loans to Money Pool											137,000,000.0
Average Borrowings from Money Pool											197,400,000
Average Loans to Money Pool											31,300,000
Net Loans (Borrowings) to/from Money Pool	[17]		78,700,000								78,700,000
Authorized Short Term Borrowing Limit	[18]										$ 820,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed											1.03%		0.32%
Average Interest Rate For Funds Loaned											2.14%		0.07%
AEP Transmission Co [Member] | Direct Borrowing [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 52,400,000
Maximum Loans to Money Pool											141,800,000
Average Borrowings from Money Pool											7,100,000
Average Loans to Money Pool											59,600,000
Borrowings from Parent			33,000,000.0								33,000,000.0
Loans to Parent			$ 0								0
Authorized Short Term Borrowing Limit	[19]										$ 50,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate for Funds Borrowed											3.39%		0.86%
Minimum Interest Rate For Funds Borrowed											0.46%		0.25%
Maximum Interest Rate For Funds Loaned											3.37%		0.86%
Minimum Interest Rate for Funds Loaned											0.46%		0.25%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed											1.56%		0.35%
Average Interest Rate For Funds Loaned											1.38%		0.34%
AEP Transmission Co [Member] | Senior Unsecured Notes Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 550,000,000.0
Due Date											2052
Interest Rate (Percentage)			4.50%								4.50%
AEP Transmission Co [Member] | Senior Unsecured Notes Nine | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		$ 104,000,000
Appalachian Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 5,509,800,000								$ 5,509,800,000				4,938,900,000
Long-term Debt Due Within One Year			351,800,000								351,800,000				480,700,000
Long-term Debt			5,158,000,000								5,158,000,000				4,458,200,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											130,400,000		$ 393,000,000.0
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			127,500,000								127,500,000				153,100,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			360,400,000				342,200,000				$ 1,114,900,000		980,600,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 698,200,000		494,000,000.0
Revenue from Related Parties			67,600,000				52,400,000				187,600,000		140,600,000
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			41,500,000	[13]			35,200,000	[14]			123,400,000	[15]	94,100,000	[16]
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			2,800,000				1,300,000	[20]			$ 5,600,000		$ 3,700,000	[20]
Appalachian Power Co [Member] | Utility [Member]
Maximum Interest Rate											3.39%		0.40%
Minimum Interest Rate											0.10%		0.02%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 438,400,000
Maximum Loans to Money Pool											214,200,000
Average Borrowings from Money Pool											180,900,000
Average Loans to Money Pool											52,800,000
Net Loans (Borrowings) to/from Money Pool			$ 182,100,000								182,100,000
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											1.39%		0.28%
Average Interest Rate For Funds Loaned											2.13%		0.28%
Appalachian Power Co [Member] | Pollution Control Bond [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 104,400,000
Due Date											2025
Interest Rate (Percentage)			3.75%								3.75%
Appalachian Power Co [Member] | Securitization Bonds Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 25,900,000
Due Date											2023
Interest Rate (Percentage)			2.01%								2.01%
Appalachian Power Co [Member] | Other Long Term Debt Seven
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 100,000
Due Date											2026
Interest Rate (Percentage)			13.72%								13.72%
Appalachian Power Co [Member] | Other Long Term Debt Ten
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 100,000,000.0
Due Date											2023
Interest Rate (Variable)											Variable
Appalachian Power Co [Member] | Pollution Control Bond Five
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 104,400,000
Due Date											2022
Interest Rate (Percentage)			2.63%								2.63%
Appalachian Power Co [Member] | Senior Unsecured Notes Four
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 500,000,000.0
Due Date											2032
Interest Rate (Percentage)			4.50%								4.50%
Appalachian Power Co [Member] | Pollution Control Bond Seven | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		100,000,000
Indiana Michigan Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,206,700,000								$ 3,206,700,000				3,195,000,000
Long-term Debt Due Within One Year			320,900,000								320,900,000				67,000,000.0
Long-term Debt			2,885,800,000								2,885,800,000				3,128,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											64,500,000		$ 307,200,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			187,800,000								187,800,000				156,900,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			558,500,000				536,800,000				1,574,300,000		1,478,900,000
Financing Activities (Textuals)
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition			326,000,000								$ 326,000,000				329,000,000
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 72,800,000		507,000,000.0
Revenue from Related Parties			2,000,000.0				1,100,000				11,100,000		2,600,000
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			8,800,000	[13]			8,700,000	[14]			26,300,000	[15]	25,300,000	[16]
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			2,800,000				2,100,000	[20]			$ 6,500,000		$ 5,300,000	[20]
Indiana Michigan Power Co [Member] | Utility [Member]
Maximum Interest Rate											3.39%		0.40%
Minimum Interest Rate											0.10%		0.02%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 159,100,000
Maximum Loans to Money Pool											22,600,000
Average Borrowings from Money Pool											86,000,000.0
Average Loans to Money Pool											22,100,000
Net Loans (Borrowings) to/from Money Pool			$ (82,300,000)								(82,300,000)
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											1.38%		0.32%
Average Interest Rate For Funds Loaned											1.46%		0.25%
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											$ 1,300,000
Due Date											2022
Interest Rate (Variable)											Variable
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											$ 3,400,000
Due Date											2022
Interest Rate (Variable)											Variable
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											2023
Interest Rate (Variable)											Variable
Indiana Michigan 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											$ 13,700,000
Due Date											2025
Interest Rate (Variable)											Variable
Indiana Michigan 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											$ 18,900,000
Due Date											2025
Interest Rate (Percentage)			0.93%								0.93%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Nine
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 8,000,000.0
Due Date											2026
Interest Rate (Percentage)			3.44%								3.44%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 72,800,000
Due Date											2026
Interest Rate (Percentage)			3.44%								3.44%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Ten | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		7,000,000
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											$ 10,800,000
Due Date											2024
Interest Rate (Variable)											Variable
Indiana Michigan Power Co [Member] | Other Long Term Debt Eight
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 1,700,000
Due Date											2025
Interest Rate (Percentage)			6.00%								6.00%
Ohio Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 2,969,900,000								$ 2,969,900,000				2,968,500,000
Long-term Debt Due Within One Year			100,000								100,000				100,000
Long-term Debt			2,969,800,000								2,969,800,000				2,968,400,000
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			476,700,000								476,700,000				392,700,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			874,100,000				668,400,000				2,284,000,000		1,867,500,000
Financing Activities (Textuals)
Issuance of Long-term Debt											0		1,037,500,000
Revenue from Related Parties			4,000,000.0				4,300,000				11,600,000		21,900,000
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			21,500,000	[13]			19,100,000	[14]			64,400,000	[15]	56,200,000	[16]
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				4,600,000	[20]			$ 22,200,000		$ 3,500,000	[20]
Ohio Power Co [Member] | Utility [Member]
Maximum Interest Rate											3.39%		0.40%
Minimum Interest Rate											0.10%		0.02%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 147,200,000
Maximum Loans to Money Pool											246,100,000
Average Borrowings from Money Pool											59,900,000
Average Loans to Money Pool											86,900,000
Net Loans (Borrowings) to/from Money Pool			$ (68,800,000)								(68,800,000)
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											1.81%		0.27%
Average Interest Rate For Funds Loaned											1.22%		0.15%
Ohio Power Co [Member] | Other Long Term Debt Nine
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 100,000
Due Date											2028
Interest Rate (Percentage)			1.15%								1.15%
Public Service Co Of Oklahoma [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 1,913,600,000								$ 1,913,600,000				1,913,500,000
Long-term Debt Due Within One Year			500,000								500,000				125,500,000
Long-term Debt			1,913,100,000								1,913,100,000				1,788,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											500,400,000		$ 750,400,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			188,400,000								188,400,000				114,500,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			588,500,000				460,100,000				$ 1,380,400,000		1,068,800,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 499,700,000		1,290,000,000
Revenue from Related Parties			700,000				1,000,000.0				2,100,000		3,100,000
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			10,200,000	[13]			10,600,000	[14]			28,900,000	[15]	28,800,000	[16]
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			2,400,000				1,100,000	[20]			$ 4,600,000		$ 2,400,000	[20]
Public Service Co Of Oklahoma [Member] | Utility [Member]
Maximum Interest Rate											3.39%		0.40%
Minimum Interest Rate											0.10%		0.02%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 338,300,000
Maximum Loans to Money Pool											432,500,000
Average Borrowings from Money Pool											200,900,000
Average Loans to Money Pool											402,800,000
Net Loans (Borrowings) to/from Money Pool			$ (223,500,000)								(223,500,000)
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											1.70%		0.34%
Average Interest Rate For Funds Loaned											0.75%		0.06%
Public Service Co Of Oklahoma [Member] | Other Long Term Debt [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 500,000,000.0
Due Date											2022
Interest Rate (Variable)											Variable
Public Service Co Of Oklahoma [Member] | Other Long Term Debt Eleven
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 500,000,000.0
Due Date											2022
Interest Rate (Variable)											Variable
Public Service Co Of Oklahoma [Member] | Other Long Term Debt Twelve
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 400,000
Due Date											2027
Interest Rate (Percentage)			3.00%								3.00%
Southwestern Electric Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,392,400,000								$ 3,392,400,000				3,395,200,000
Long-term Debt Due Within One Year			6,200,000								6,200,000				6,200,000
Long-term Debt			3,386,200,000								3,386,200,000				3,389,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											4,700,000		$ 4,700,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			217,000,000.0								217,000,000.0				153,000,000.0
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			593,600,000				488,500,000				$ 1,425,300,000		1,265,500,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization											67.50%
Issuance of Long-term Debt											$ 0		496,400,000
Revenue from Related Parties			18,200,000				13,500,000				43,700,000		32,200,000
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			42,300,000	[13]			37,100,000	[14]			116,800,000	[15]	94,500,000	[16]
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			3,200,000				1,300,000	[20]			$ 6,000,000.0		$ 4,100,000	[20]
Southwestern Electric Power Co [Member] | Utility [Member]
Maximum Interest Rate											3.39%		0.40%
Minimum Interest Rate											0.10%		0.02%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool											$ 261,600,000
Maximum Loans to Money Pool											156,600,000
Average Borrowings from Money Pool											191,000,000.0
Average Loans to Money Pool											109,700,000
Net Loans (Borrowings) to/from Money Pool			(156,300,000)								(156,300,000)
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											1.67%		0.28%
Average Interest Rate For Funds Loaned											0.55%		0.38%
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								$ 2,100,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned											3.39%		0.41%
Minimum Interest Rate for Funds Loaned											0.46%		0.21%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned											1.52%		0.34%
Southwestern Electric Power Co [Member] | Other Long Term Debt Thirteen
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 1,500,000
Due Date											2028
Interest Rate (Percentage)			4.68%								4.68%
Southwestern Electric 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											$ 3,200,000
Due Date											2032
Interest Rate (Percentage)			4.58%								4.58%
Transource Energy [Member] | Other Long Term Debt Five
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 5,000,000.0
Due Date											2023
Interest Rate (Variable)											Variable
Transource Energy [Member] | Senior Unsecured Notes Seven
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 2,400,000
Due Date											2050
Interest Rate (Percentage)			2.75%								2.75%
Transource Energy [Member] | Other Long Term Debt Fifteen | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt		64,000,000
Transource Energy [Member] | Other Long Term Debt Sixteen | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		64,000,000
Kentucky Power Co [Member] | Total Long-Term Debt Due Within One Year
Long-term Debt
Liabilities Held for Sale			$ 215,000,000								$ 215,000,000				200,000,000
Kentucky Power Co [Member] | Total Long-Term Debt
Long-term Debt
Liabilities Held for Sale			$ 963,000,000								963,000,000				$ 903,000,000
Kentucky Power Co [Member] | OtherLongTermDebtFour
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 150,000,000.0
Due Date											2023
Interest Rate (Variable)											Variable
Kentucky Power Co [Member] | Other Long Term Debt Fourteen
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 75,000,000.0
Due Date											2022
Interest Rate (Variable)											Variable
Wheeling Power Company | Other Long Term Debt Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 165,000,000.0
Due Date											2024
Interest Rate (Variable)											Variable
Wheeling Power Company | Pollution Control Bond Three
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 65,000,000.0
Due Date											2027
Interest Rate (Percentage)			3.00%								3.00%
Wheeling Power Company | Pollution Control Bond Six
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 65,000,000.0
Due Date											2022
Interest Rate (Percentage)			3.00%								3.00%
Wheeling Power Company | Senior Unsecured Notes Eight
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 113,000,000.0
Due Date											2022
Interest Rate (Percentage)			3.36%								3.36%
AEP Generating Company | Pollution Control Bond Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]										$ 45,000,000.0
Due Date											2025
Interest Rate (Percentage)			3.13%								3.13%
AEP Generating Company | Pollution Control Bond Four
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt											$ 45,000,000.0
Due Date											2022
Interest Rate (Percentage)			1.35%								1.35%
AEP Generating Company | Other Long Term Debt Seventeen | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		120,000,000
AEP Generating Company | Other Long Term Debt Eighteen | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt		$ 80,000,000
Maximum [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
AEP Share Price for Equity Unit Conversion			$ 99.95								$ 99.95
Shares Per Equity Unit			0.5003								0.5003
Minimum [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
AEP Share Price for Equity Unit Conversion			$ 83.29								$ 83.29
Shares Per Equity Unit			0.6003								0.6003
Additional Paid-in Capital [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30,			$ (3,000,000.0)		$ (17,200,000)	$ 15,200,000	$ (6,300,000)		$ 200,000	$ 21,900,000
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 $326 million and $329 million as of September 30, 2022 and December 31, 2021, 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] The book value amounts exclude Long-term Debt of $1.2 billion and $1.1 billion as of September 30, 2022 and December 31, 2021, respectively, classified as Liabilities Held for Sale on the balance sheets. See “Disposition of KPCo and KTCo” section of Note 6 for additional information.

[4] Amount excludes $215 million and $200 million as of September 30, 2022 and December 31, 2021, respectively, of Long-term Debt Due Within One Year classified as Liabilities Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 6 for additional information.

[5] Amount excludes $963 million and $903 million as of September 30, 2022 and December 31, 2021, respectively, of Long-term Debt classified as Liabilities Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 6 for additional information.

[6] 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.

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

[8] Weighted-average rate.

[9] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $342 million. The remaining affiliated amounts were immaterial.

[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $286 million. The remaining affiliated amounts were immaterial.

[11] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1 billion. The affiliated revenue for Vertically Integrated Utilities was $120 million. The remaining affiliated amounts were immaterial.

[12] (a)Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $835 million. The remaining affiliated amounts were immaterial.

[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $339 million. The remaining affiliated amounts were immaterial.

[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $281 million. The remaining affiliated amounts were immaterial.

[15] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $992 million. The remaining affiliated amounts were immaterial.

[16] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $823 million. The remaining affiliated amounts were immaterial.

[17] (a)    Amount excludes $5 million of Advances to Affiliates classified as Assets Held for Sale on the AEPTCo balance sheet. See “Dispositions of KPCo and KTCo” section of Note 6 for additional information

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

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

[20] In 2020, an increase in allowance for doubtful accounts was recognized in response to the anticipated impact of COVID-19 on the collectability of accounts receivable, which caused an increase in fees paid by the Registrants. In 2021, due to higher than expected collections of accounts receivables, allowance for doubtful accounts was adjusted resulting in the issuance of credits to offset the higher fees previously paid.