Financing Activities (Details) - USD ($)		1 Months Ended	3 Months Ended					6 Months Ended
		Jul. 27, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021		Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021		Dec. 31, 2021
Long-term Debt
Senior Unsecured Notes			$ 28,855,600,000					$ 28,855,600,000			$ 27,497,300,000
Pollution Control Bonds			1,804,400,000					1,804,400,000			1,804,500,000
Notes Payable			242,900,000					242,900,000			211,300,000
Securitization Bonds			549,400,000					549,400,000			603,500,000
Spent Nuclear Fuel Obligation	[1]		281,800,000					281,800,000			281,300,000
Junior Subordinated Notes	[2]		2,375,400,000					2,375,400,000			2,373,000,000
Other Long-term Debt			1,349,900,000					1,349,900,000			683,600,000
Total Long-term Debt Outstanding	[3]		35,459,400,000					35,459,400,000			33,454,500,000
Long-term Debt Due Within One Year	[4]		2,476,700,000					2,476,700,000			2,153,800,000
Long-term Debt	[5]		32,982,700,000					32,982,700,000			31,300,700,000
Liabilities Held for Sale			1,900,300,000					1,900,300,000			1,880,900,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[6]							2,662,200,000
Repayments of Long-term Debt								582,400,000	$ 998,100,000
Short-term Debt:
Securitized Debt for Receivables	[7]		750,000,000.0					750,000,000.0			750,000,000.0
Commercial Paper			880,000,000.0					880,000,000.0			1,364,000,000
Total Short-term Debt			$ 2,130,000,000					$ 2,130,000,000			$ 2,614,000,000
Securitized Debt for Receivables	[7],[8]		0.61%					0.61%			0.19%
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable			0.91%		0.19%			0.61%	0.20%
Net Uncollectible Accounts Receivable Written Off			$ 6,200,000		$ 5,800,000			$ 13,600,000	$ 15,100,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts			1,114,700,000					1,114,700,000			$ 995,200,000
Total Principal Outstanding			750,000,000.0					750,000,000.0			750,000,000.0
Delinquent Securitized Accounts Receivable			44,000,000.0					44,000,000.0			57,900,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable			41,200,000					41,200,000			42,800,000
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable			334,300,000					334,300,000			307,100,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			4,639,700,000		3,826,500,000			9,232,300,000	8,107,600,000
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								$ 812,700,000	256,900,000
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition			325,000,000					$ 325,000,000			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,			(18,800,000)	$ 16,700,000	(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			2,945,700,000					2,945,700,000			$ 2,919,700,000
Issuance of Long-term Debt								$ 2,639,100,000	3,055,100,000
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			$ 2,000,000					$ 2,000,000
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]		2.02%					2.02%			0.34%
Term Loan [Member]
Short-term Debt:
Weighted Average Interest Rate	[8],[9]		2.20%					2.20%			0.81%
Term Loan	[9]		$ 500,000,000.0					$ 500,000,000.0			$ 500,000,000.0
AEP Texas Inc. [Member]
Long-term Debt
Total Long-term Debt Outstanding			6,128,200,000					6,128,200,000			5,180,800,000
Long-term Debt Due Within One Year			642,200,000					642,200,000			716,000,000.0
Long-term Debt			5,486,000,000					5,486,000,000			4,464,800,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt								$ 242,000,000.0	40,900,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization								67.50%
Issuance of Long-term Debt								$ 1,188,600,000	$ 444,300,000
AEP Texas Inc. [Member] | Utility [Member]
Maximum Interest Rate								2.11%	0.40%
Minimum Interest Rate								0.10%	0.25%
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								617,900,000
Net Loans (Borrowings) to/from Money Pool			634,100,000					634,100,000
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								0.90%	0.33%
Average Interest Rate For Funds Loaned								1.48%	0.36%
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								2.11%	0.40%
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 Loaned								0.98%	0.33%
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								$ 11,400,000
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 Five
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 Seven | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		$ 400,000,000
AEP Transmission Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 4,885,600,000					$ 4,885,600,000			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			4,781,600,000					4,781,600,000			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									$ 100,000
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			$ 171,500,000					$ 171,500,000			167,900,000
Issuance of Long-term Debt								$ 540,900,000	$ 0
AEP Transmission Co [Member] | Utility [Member]
Maximum Interest Rate								2.11%	0.40%
Minimum Interest Rate								0.10%	0.25%
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								274,200,000
Average Loans to Money Pool								13,300,000
Net Loans (Borrowings) to/from Money Pool	[10]		103,800,000					103,800,000
Authorized Short Term Borrowing Limit	[11]							$ 820,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed								0.93%	0.33%
Average Interest Rate For Funds Loaned								1.49%	0.34%
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								6,800,000
Average Loans to Money Pool								62,000,000.0
Borrowings from Parent			25,700,000					25,700,000
Loans to Parent			$ 0					0
Authorized Short Term Borrowing Limit	[12]							$ 50,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate for Funds Borrowed								2.11%	0.86%
Minimum Interest Rate For Funds Borrowed								0.46%	0.25%
Maximum Interest Rate For Funds Loaned								2.11%	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								1.02%	0.33%
Average Interest Rate For Funds Loaned								0.89%	0.33%
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%
Appalachian Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 4,927,200,000					$ 4,927,200,000			4,938,900,000
Long-term Debt Due Within One Year			251,600,000					251,600,000			480,700,000
Long-term Debt			4,675,600,000					4,675,600,000			4,458,200,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt								117,100,000	$ 380,000,000.0
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			150,300,000					150,300,000			153,100,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			339,000,000.0		276,000,000.0			$ 754,500,000	638,400,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization								67.50%
Issuance of Long-term Debt								$ 103,300,000	494,000,000.0
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			1,500,000		1,200,000	[13]		$ 2,800,000	$ 2,400,000	[13]
Appalachian Power Co [Member] | Utility [Member]
Maximum Interest Rate								2.11%	0.40%
Minimum Interest Rate								0.10%	0.25%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool								$ 404,000,000.0
Maximum Loans to Money Pool								20,800,000
Average Borrowings from Money Pool								148,700,000
Average Loans to Money Pool								19,800,000
Net Loans (Borrowings) to/from Money Pool			$ (329,800,000)					(329,800,000)
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								1.08%	0.28%
Average Interest Rate For Funds Loaned								0.95%	0.36%
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								2042
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								$ 12,700,000
Due Date								2023
Interest Rate (Percentage)			2.01%					2.01%
Appalachian Power Co [Member] | Other Long Term Debt Eleven | Subsequent Event [Member]
Financing Activities (Textuals)
Issuance of Long-term Debt		100,000,000
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%
Indiana Michigan Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,228,700,000					$ 3,228,700,000			3,195,000,000
Long-term Debt Due Within One Year			326,800,000					326,800,000			67,000,000.0
Long-term Debt			2,901,900,000					2,901,900,000			3,128,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt								40,700,000	$ 282,700,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			193,000,000.0					193,000,000.0			156,900,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			502,400,000		463,300,000			1,015,800,000	942,100,000
Financing Activities (Textuals)
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition			325,000,000					$ 325,000,000			329,000,000
Maximum Percentage Debt to Capitalization								67.50%
Issuance of Long-term Debt								$ 72,800,000	507,000,000.0
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			2,000,000.0		1,600,000	[13]		$ 3,700,000	$ 3,200,000	[13]
Indiana Michigan Power Co [Member] | Utility [Member]
Maximum Interest Rate								2.11%	0.40%
Minimum Interest Rate								0.10%	0.25%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool								$ 159,100,000
Maximum Loans to Money Pool								22,500,000
Average Borrowings from Money Pool								91,900,000
Average Loans to Money Pool								21,900,000
Net Loans (Borrowings) to/from Money Pool			$ (28,000,000.0)					(28,000,000.0)
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								0.92%	0.32%
Average Interest Rate For Funds Loaned								0.96%	0.35%
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								$ 2,300,000
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								$ 6,100,000
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								$ 9,000,000.0
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								$ 12,600,000
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								$ 1,100,000
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] | Other Long Term Debt Six
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt								$ 1,100,000
Due Date								2025
Interest Rate (Percentage)			6.00%					6.00%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Eleven | 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 Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt								$ 7,200,000
Due Date								2024
Interest Rate (Variable)								Variable
Ohio Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 2,969,400,000					$ 2,969,400,000			2,968,500,000
Long-term Debt Due Within One Year			100,000					100,000			100,000
Long-term Debt			2,969,300,000					2,969,300,000			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			441,100,000					441,100,000			392,700,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			693,300,000		597,800,000			1,409,900,000	1,199,100,000
Financing Activities (Textuals)
Issuance of Long-term Debt								0	445,800,000
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			7,500,000		(2,400,000)	[13]		$ 14,900,000	$ (1,100,000)	[13]
Ohio Power Co [Member] | Utility [Member]
Maximum Interest Rate								2.11%	0.40%
Minimum Interest Rate								0.10%	0.25%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool								$ 112,200,000
Maximum Loans to Money Pool								246,100,000
Average Borrowings from Money Pool								56,200,000
Average Loans to Money Pool								97,900,000
Net Loans (Borrowings) to/from Money Pool			$ 56,000,000.0					56,000,000.0
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								0.83%	0.34%
Average Interest Rate For Funds Loaned								1.20%	0.29%
Ohio 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								2028
Interest Rate (Percentage)			1.15%					1.15%
Public Service Co Of Oklahoma [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 2,413,800,000					$ 2,413,800,000			1,913,500,000
Long-term Debt Due Within One Year			625,500,000					625,500,000			125,500,000
Long-term Debt			1,788,300,000					1,788,300,000			1,788,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt								300,000	$ 250,300,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			166,900,000					166,900,000			114,500,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			428,500,000		323,800,000			$ 791,900,000	608,700,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization								67.50%
Issuance of Long-term Debt								$ 500,000,000.0	500,000,000.0
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			1,300,000		600,000	[13]		$ 2,200,000	$ 1,300,000	[13]
Public Service Co Of Oklahoma [Member] | Utility [Member]
Maximum Interest Rate								2.11%	0.40%
Minimum Interest Rate								0.10%	0.25%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool								$ 299,900,000
Maximum Loans to Money Pool								432,500,000
Average Borrowings from Money Pool								179,800,000
Average Loans to Money Pool								403,600,000
Net Loans (Borrowings) to/from Money Pool			$ (283,400,000)					(283,400,000)
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								1.17%	0.34%
Average Interest Rate For Funds Loaned								0.65%	0.28%
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 Nine
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt								$ 300,000
Due Date								2027
Interest Rate (Percentage)			3.00%					3.00%
Southwestern Electric Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,393,400,000					$ 3,393,400,000			3,395,200,000
Long-term Debt Due Within One Year			6,200,000					6,200,000			6,200,000
Long-term Debt			3,387,200,000					3,387,200,000			3,389,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt								3,100,000	$ 3,100,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			189,200,000					189,200,000			153,000,000.0
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			437,200,000		392,600,000			$ 831,700,000	777,000,000.0
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization								67.50%
Issuance of Long-term Debt								$ 0	496,400,000
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			1,500,000		1,300,000	[13]		$ 2,800,000	$ 2,800,000	[13]
Southwestern Electric Power Co [Member] | Utility [Member]
Maximum Interest Rate								2.11%	0.40%
Minimum Interest Rate								0.10%	0.25%
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								226,600,000
Average Loans to Money Pool								109,700,000
Net Loans (Borrowings) to/from Money Pool			(213,200,000)					(213,200,000)
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								1.25%	0.32%
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								2.11%	0.40%
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 Loaned								0.98%	0.33%
Southwestern Electric Power Co [Member] | Other Long Term Debt Ten
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 Ten
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt								$ 1,600,000
Due Date								2032
Interest Rate (Percentage)			4.58%					4.58%
Transource Energy [Member] | Other Long Term Debt Two [Member]
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 Five
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt								$ 1,100,000
Due Date								2050
Interest Rate (Percentage)			2.75%					2.75%
Kentucky Power Co [Member] | Total Long-Term Debt Due Within One Year
Long-term Debt
Liabilities Held for Sale			$ 415,000,000					$ 415,000,000			200,000,000
Kentucky Power Co [Member] | Total Long-Term Debt
Long-term Debt
Liabilities Held for Sale			$ 688,000,000					688,000,000			$ 903,000,000
Kentucky Power Co [Member] | Other Long Term Debt Twelve | Subsequent Event [Member]
Financing Activities (Textuals)
Issuance of Long-term Debt		$ 75,000,000
Wheeling Power Company | OtherLongTermDebtFour
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 Two [Member]
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 | Senior Unsecured Notes Six
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%
Wheeling Power Company | Pollution Control Bond Four
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%
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,			$ (17,200,000)	$ 15,200,000	$ 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 $325 million and $329 million as of June 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 $1.1 billion and $1.1 billion as of June 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 $415 million and $200 million as of June 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 $688 million and $903 million as of June 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] In March 2022, AEP extended the maturity date of the original 364-Day Term Loan to August 2022.

[10] (a)    Amount excludes $2 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

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

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

[13] 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.