Financing Activities (Details) - USD ($)		1 Months Ended	3 Months Ended
		Apr. 22, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Long-term Debt
Senior Unsecured Notes			$ 25,919,800,000		$ 25,116,100,000
Pollution Control Bonds			1,937,000,000.0		1,936,700,000
Notes Payable			213,900,000		239,100,000
Securitization Bonds			693,000,000.0		716,400,000
Spent Nuclear Fuel Obligation	[1]		281,200,000		281,200,000
Junior Subordinated Notes	[2]		1,626,000,000.0		1,624,100,000
Other Long-term Debt			1,674,100,000		1,158,900,000
Total Long-term Debt Outstanding			32,345,000,000.0		31,072,500,000
Long-term Debt Due Within One Year			2,130,200,000		2,086,100,000
Long-term Debt			30,214,800,000		28,986,400,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]		1,964,600,000
Repayments of Long-term Debt			650,700,000	$ 300,500,000
Short-term Debt:
Securitized Debt for Receivables	[4]		669,000,000.0		592,000,000.0
Commercial Paper			1,874,400,000		1,852,300,000
364-Day Term Loan			500,000,000.0		0
Notes Payable			5,000,000.0		35,000,000.0
Total Short-term Debt			$ 3,048,400,000		$ 2,479,300,000
Securitized Debt for Receivables	[4],[5]		0.20%		0.85%
Comparative Accounts Receivable Information
Effective Interest Rates on Securitization of Accounts Receivable			0.20%	1.75%
Net Uncollectible Accounts Receivable Written Off			$ 9,300,000	$ 4,200,000
Customer Accounts Receivable Managed Portfolio
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts			871,400,000		$ 958,400,000
Total Principal Outstanding			669,000,000.0		592,000,000.0
Delinquent Securitized Accounts Receivable			67,700,000		62,300,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable			47,600,000		60,000,000.0
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable			211,200,000		296,800,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
Fees Paid to AEP Credit for Customer Accounts Receivable Sold			4,281,100,000	3,747,500,000
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			$ 184,600,000	56,100,000
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition			$ 326,000,000		$ 324,000,000
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 March 31,			$ 19,100,000	30,200,000
Equity Distribution Agreement
Financing Activities (Textuals)
Stock Issued During Period, Shares, New Issues			1,917,140
Issuance of Common Stock			$ 158,000,000
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
Corporate unit ownership share of an equity unit			5.00%
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
2019 Equity Units [Member]
Financing Activities (Textuals)
Equity Units Issued			16,100,000
Per Unit Conversion for Equity Units			$ 50
Net Equity Units Issuance Proceeds			$ 785,000,000
Corporate unit ownership share of an equity unit			5.00%
Principal Amounts of Junior Subordinated Debt			$ 1,000
Forward Equity Purchase Contract Date			2022
Equity Units Annual Distribution Rate			6.125%
Forward Equity Contract Payment Rate			2.725%
Maximum Shares Issued Under Equity Units Conversion			9,701,860
Subsequent Event [Member] | Equity Distribution Agreement
Financing Activities (Textuals)
Stock Issued During Period, Shares, New Issues		438,165
Issuance of Common Stock		$ 37,000,000
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%
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%
Commercial Paper [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]		0.27%		0.29%
364 Day Term Loan
Short-term Debt:
Weighted Average Interest Rate	[5]		0.71%		0.00%
Loans Payable [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]		2.75%		2.55%
AEP Texas Inc. [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 4,810,200,000		$ 4,820,400,000
Long-term Debt Due Within One Year			88,900,000		88,700,000
Long-term Debt			4,721,300,000		4,731,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 11,200,000	$ 114,300,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization			67.50%
AEP Texas Inc. [Member] | Utility [Member]
Maximum Interest Rate			0.40%	2.24%
Minimum Interest Rate			0.25%	1.76%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 295,500,000
Maximum Loans to Money Pool			0
Average Borrowings from Money Pool			197,800,000
Average Loans to Money Pool			0
Net Loans (Borrowings) to/from Money Pool			(284,000,000.0)
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			0.31%	2.05%
Average Interest Rate For Funds Loaned			0.00%	1.97%
AEP Texas Inc. [Member] | Nonutility [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Loans to Money Pool			$ 7,100,000
Average Loans to Money Pool			6,900,000
Net Loans (Borrowings) to/from Money Pool			$ 6,800,000
Maximum and Minimum Interest Rates
Maximum Interest Rate For Funds Loaned			0.40%	2.24%
Minimum Interest Rate for Funds Loaned			0.25%	1.76%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned			0.30%	1.94%
AEP Texas Inc. [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 11,200,000
Due Date			2025
Interest Rate (Percentage)			2.06%
AEP Transmission Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,949,000,000.0		3,948,500,000
Long-term Debt Due Within One Year			50,000,000.0		50,000,000.0
Long-term Debt			3,899,000,000.0		3,898,500,000
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			2.50%
Maximum Percentage Debt to Capitalization			67.50%
AEP Transmission Co [Member] | Utility [Member]
Maximum Interest Rate			0.40%	2.24%
Minimum Interest Rate			0.25%	1.76%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 330,600,000
Maximum Loans to Money Pool			3,500,000
Average Borrowings from Money Pool			230,100,000
Average Loans to Money Pool			1,600,000
Net Loans (Borrowings) to/from Money Pool			(227,800,000)
Authorized Short Term Borrowing Limit	[6]		$ 820,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			0.31%	1.95%
Average Interest Rate For Funds Loaned			0.28%	1.91%
AEP Transmission Co [Member] | Direct Borrowing [Member]
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 1,200,000
Maximum Loans to Money Pool			220,600,000
Average Borrowings from Money Pool			1,200,000
Average Loans to Money Pool			148,700,000
Borrowings from Parent			1,200,000
Loans to Parent			105,800,000
Authorized Short Term Borrowing Limit	[7]		$ 50,000,000.0
Maximum and Minimum Interest Rates
Maximum Interest Rate for Funds Borrowed			0.86%	2.24%
Minimum Interest Rate For Funds Borrowed			0.25%	1.76%
Maximum Interest Rate For Funds Loaned			0.86%	2.24%
Minimum Interest Rate for Funds Loaned			0.25%	1.76%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			0.31%	1.94%
Average Interest Rate For Funds Loaned			0.31%	1.94%
Appalachian Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 4,966,200,000		4,834,100,000
Long-term Debt Due Within One Year			168,500,000		518,300,000
Long-term Debt			4,797,700,000		4,315,800,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			362,500,000	$ 12,200,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			132,600,000		136,000,000.0
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			$ 362,400,000	352,600,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization			67.50%
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			$ 1,200,000	$ 1,700,000
Appalachian Power Co [Member] | Utility [Member]
Maximum Interest Rate			0.40%	2.24%
Minimum Interest Rate			0.25%	1.76%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 27,800,000
Maximum Loans to Money Pool			616,900,000
Average Borrowings from Money Pool			13,200,000
Average Loans to Money Pool			152,400,000
Net Loans (Borrowings) to/from Money Pool			261,100,000
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			0.28%	1.95%
Average Interest Rate For Funds Loaned			0.36%	1.94%
Appalachian Power Co [Member] | Pollution Control Bond [Member] | Subsequent Event [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt		18,000,000
Appalachian Power Co [Member] | Securitization Bonds [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 12,500,000
Due Date			2023
Interest Rate (Percentage)			2.01%
Appalachian Power Co [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]		$ 500,000,000.0
Due Date			2031
Interest Rate (Percentage)			2.70%
Appalachian Power Co [Member] | Senior Unsecured Notes Two [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 350,000,000.0
Due Date			2021
Interest Rate (Percentage)			4.60%
Indiana Michigan Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,006,300,000		3,029,900,000
Long-term Debt Due Within One Year			363,100,000		369,600,000
Long-term Debt			2,643,200,000		2,660,300,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			24,100,000	$ 23,700,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			154,000,000.0		170,500,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			478,800,000	471,400,000
Financing Activities (Textuals)
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition			$ 326,000,000		324,000,000
Maximum Percentage Debt to Capitalization			67.50%
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			$ 1,600,000	$ 2,800,000
Indiana Michigan Power Co [Member] | Utility [Member]
Maximum Interest Rate			0.40%	2.24%
Minimum Interest Rate			0.25%	1.76%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 166,500,000
Maximum Loans to Money Pool			13,300,000
Average Borrowings from Money Pool			118,200,000
Average Loans to Money Pool			13,300,000
Net Loans (Borrowings) to/from Money Pool			(111,300,000)
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			0.31%	1.95%
Average Interest Rate For Funds Loaned			0.30%	1.94%
Indiana Michigan Power Co [Member] | Notes Payable, Other Payables [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 1,500,000
Due Date			2021
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		$ 6,000,000
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			$ 1,500,000
Due Date			2022
Interest Rate (Variable)			Variable
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			$ 3,400,000
Due Date			2022
Interest Rate (Variable)			Variable
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			$ 4,800,000
Due Date			2023
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			$ 5,900,000
Due Date			2024
Interest Rate (Variable)			Variable
Indiana Michigan Power Co [Member] | Notes Payable, Other Payables Six [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 6,500,000
Due Date			2025
Interest Rate (Variable)			Variable
Indiana Michigan Power Co [Member] | Other Long Term Debt [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%
Ohio Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 2,876,300,000		2,430,200,000
Long-term Debt Due Within One Year			500,100,000		500,100,000
Long-term Debt			2,376,200,000		1,930,100,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			360,200,000		398,800,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			601,300,000	$ 570,300,000
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			$ 1,300,000	$ 4,800,000
Ohio Power Co [Member] | Utility [Member]
Maximum Interest Rate			0.40%	2.24%
Minimum Interest Rate			0.25%	1.76%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 259,200,000
Maximum Loans to Money Pool			222,400,000
Average Borrowings from Money Pool			175,100,000
Average Loans to Money Pool			107,400,000
Net Loans (Borrowings) to/from Money Pool			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			0.29%	1.90%
Average Interest Rate For Funds Loaned			0.29%	2.06%
Ohio Power Co [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]		$ 450,000,000.0
Due Date			2031
Interest Rate (Percentage)			1.63%
Public Service Co Of Oklahoma [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 1,623,800,000		1,373,800,000
Long-term Debt Due Within One Year			500,000		500,000
Long-term Debt			1,623,300,000		1,373,300,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			250,100,000	$ 100,000
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			76,200,000		85,000,000.0
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			$ 284,900,000	294,900,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization			67.50%
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			$ 700,000	$ 1,300,000
Public Service Co Of Oklahoma [Member] | Utility [Member]
Maximum Interest Rate			0.40%	2.24%
Minimum Interest Rate			0.25%	1.76%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 262,000,000.0
Maximum Loans to Money Pool			210,100,000
Average Borrowings from Money Pool			130,300,000
Average Loans to Money Pool			122,000,000.0
Net Loans (Borrowings) to/from Money Pool			(245,700,000)
Authorized Short Term Borrowing Limit			$ 300,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			0.33%	2.00%
Average Interest Rate For Funds Loaned			0.28%	1.95%
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	[3]		$ 500,000,000.0
Due Date			2022
Interest Rate (Variable)			Variable
Public Service Co Of Oklahoma [Member] | Other Long Term Debt Two [Member]
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 [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 250,000,000.0
Due Date			2021
Interest Rate (Percentage)			4.40%
Southwestern Electric Power Co [Member]
Long-term Debt
Total Long-term Debt Outstanding			$ 3,131,400,000		2,636,400,000
Long-term Debt Due Within One Year			381,200,000		106,200,000
Long-term Debt			2,750,200,000		2,530,200,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			1,600,000	$ 1,600,000
Short-term Debt:
Notes Payable			5,000,000.0		35,000,000.0
Accounts Receivable and Accrued Unbilled Revenues
Accounts Receivable and Accrued Unbilled Revenues			132,900,000		$ 158,600,000
Proceeds from Sale of Receivables
Proceeds from Sale of Receivables to AEP Credit			$ 384,400,000	365,600,000
Financing Activities (Textuals)
Maximum Percentage Debt to Capitalization			67.50%
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	$ 2,100,000
Southwestern Electric Power Co [Member] | Utility [Member]
Maximum Interest Rate			0.40%	2.24%
Minimum Interest Rate			0.25%	1.76%
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits
Maximum Borrowings from Money Pool			$ 280,300,000
Maximum Loans to Money Pool			156,400,000
Average Borrowings from Money Pool			169,300,000
Average Loans to Money Pool			142,000,000.0
Net Loans (Borrowings) to/from Money Pool			(86,900,000)
Authorized Short Term Borrowing Limit			$ 350,000,000.0
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Borrowed			0.28%	1.95%
Average Interest Rate For Funds Loaned			0.38%	0.00%
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			0.40%	2.24%
Minimum Interest Rate for Funds Loaned			0.25%	1.76%
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool
Average Interest Rate For Funds Loaned			0.30%	1.94%
Southwestern Electric Power Co [Member] | Notes Payable, Other Payables [Member]
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%
Southwestern Electric Power Co [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Proceeds from Issuance of Debt	[3]		$ 500,000,000.0
Due Date			2026
Interest Rate (Percentage)			1.65%
Southwestern Electric Power Co [Member] | Loans Payable [Member]
Short-term Debt:
Weighted Average Interest Rate	[5]		2.75%		2.55%
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]		$ 14,600,000
Due Date			2023
Interest Rate (Variable)			Variable
Transource Energy [Member] | Senior Unsecured Notes [Member]
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made
Repayments of Long-term Debt			$ 1,200,000
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			0.6003
Maximum [Member] | 2019 Equity Units [Member]
Financing Activities (Textuals)
AEP Share Price for Equity Unit Conversion			$ 99.58
Shares Per Equity Unit			0.6026
Minimum [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
AEP Share Price for Equity Unit Conversion			$ 83.29
Shares Per Equity Unit			0.5003
Minimum [Member] | 2019 Equity Units [Member]
Financing Activities (Textuals)
AEP Share Price for Equity Unit Conversion			$ 82.98
Shares Per Equity Unit			0.5021
Retained Earnings [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of March 31,			$ 600,000
Additional Paid-in Capital [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of March 31,			21,900,000	$ 29,000,000.0
Additional Paid-in Capital [Member] | 2020 Equity Units [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of March 31,			121,000,000
Additional Paid-in Capital [Member] | 2019 Equity Units [Member]
Financing Activities (Textuals)
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of March 31,			$ 62,000,000

[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 $324 million as of March 31, 2021 and December 31, 2020, 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.

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

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