Consolidated Statements of Income - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023		Mar. 31, 2022
Revenues
Revenue from Contracts with Customers		$ 4,690.9		$ 4,592.6
Sales to AEP Affiliates		0.0		0.0
TOTAL REVENUES		4,690.9		4,592.6
Expenses
Other Operation		680.0		662.2
Maintenance		317.3		285.0
Depreciation and Amortization		775.5		792.4
Taxes Other Than Income Taxes		394.9		364.2
TOTAL EXPENSES		3,986.1		3,604.5
OPERATING INCOME (LOSS)		704.8		988.1
Other Income (Expense):
Other Income		14.7		2.3
Allowance for Equity Funds Used During Construction		31.3		31.0
Non-Service Cost Components of Net Periodic Benefit Cost		55.5		47.2
Interest Expense		(415.7)		(313.4)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		390.6		755.2
Income Tax Expense (Benefit)		10.4		52.8
Equity Earnings (Loss) of Unconsolidated Subsidiaries		20.2		15.7
Net Income (Loss)		400.4		718.1
Net Income (Loss) Attributable to Noncontrolling Interests		3.4		3.4
Earnings Attributable to Common Shareholders		$ 397.0		$ 714.7
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding		514,176,648		506,050,147
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 0.77		$ 1.41
Weighted Average Number of Diluted AEP Common Shares Outstanding		515,598,090		507,658,522
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 0.77		$ 1.41
Common Stock, Dividends Per Share, Declared		$ 0.83		$ 0.78
Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		$ 2,816.3		$ 2,646.8
Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		1,455.3		1,242.2
Generation and Marketing [Member]
Revenues
Revenue from Contracts with Customers		326.9		609.5
Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		92.4		94.1
TOTAL REVENUES		(129.9)	[1]	165.4	[2],[3]
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		1,706.4		1,500.7
AEP Texas Inc. [Member]
Revenues
Sales to AEP Affiliates		1.2		0.9
TOTAL REVENUES		429.5		416.7
Expenses
Other Operation		146.9		125.8
Maintenance		24.4		22.6
Depreciation and Amortization		111.0		108.8
Taxes Other Than Income Taxes		43.5		37.3
TOTAL EXPENSES		325.8		294.5
OPERATING INCOME (LOSS)		103.7		122.2
Other Income (Expense):
Interest Income		0.4		0.1
Allowance for Equity Funds Used During Construction		6.3		4.3
Non-Service Cost Components of Net Periodic Benefit Cost		4.8		4.2
Interest Expense		(56.9)		(45.5)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		58.3		85.3
Income Tax Expense (Benefit)		10.7		15.7
Net Income (Loss)		47.6		69.6
AEP Texas Inc. [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		427.7		414.7
AEP Texas Inc. [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.6		1.1
TOTAL REVENUES		0.0	[4]	0.0	[5]
AEP Transmission Co [Member]
Revenues
Sales to AEP Affiliates		357.4		325.0
Provision for Refund Affiliated		(4.8)		(0.3)
Provision for Refund-Nonaffiliated		(1.0)		(11.3)
TOTAL REVENUES		441.6		400.4
Expenses
Other Operation		29.0		25.5
Maintenance		4.9		3.3
Depreciation and Amortization		95.2		83.1
Taxes Other Than Income Taxes		74.8		65.6
TOTAL EXPENSES		203.9		177.5
OPERATING INCOME (LOSS)		237.7		222.9
Other Income (Expense):
Interest Income		1.5		0.1
Allowance for Equity Funds Used During Construction		16.4		15.6
Interest Expense		(45.2)		(37.7)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		210.4		200.9
Income Tax Expense (Benefit)		47.7		45.5
Net Income (Loss)		162.7		155.4
Earnings Per Share
Revenues from Related Parties, Net of Provisions for Refund		352.6		324.7
AEP Transmission Co [Member] | AEPTCo Parent [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0
Sales to AEP Affiliates		0.0		0.0
TOTAL REVENUES		0.0		0.0
Other Income (Expense):
Net Income (Loss)	[6]	1.1		0.0
AEP Transmission Co [Member] | State Transcos [Member]
Revenues
Sales to AEP Affiliates		352.6		324.7
TOTAL REVENUES		441.6		400.4
Other Income (Expense):
Net Income (Loss)		161.6		155.4
AEP Transmission Co [Member] | Transmission [Member]
Revenues
Revenue from Contracts with Customers		90.0		87.0
Earnings Per Share
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax		89.0		75.7
AEP Transmission Co [Member] | Transmission [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers		89.0		75.7
AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
TOTAL REVENUES		0.0	[4]	0.0	[5]
Appalachian Power Co [Member]
Revenues
Sales to AEP Affiliates		69.6		56.9
TOTAL REVENUES		987.7		907.3
Expenses
Other Operation		191.8		184.9
Maintenance		73.1		74.1
Depreciation and Amortization		143.0		145.2
Taxes Other Than Income Taxes		41.8		40.2
TOTAL EXPENSES		789.4		714.9
OPERATING INCOME (LOSS)		198.3		192.4
Other Income (Expense):
Interest Income		0.6		0.1
Allowance for Equity Funds Used During Construction		2.4		2.0
Non-Service Cost Components of Net Periodic Benefit Cost		8.1		7.3
Interest Expense		(65.3)		(54.3)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		144.1		147.5
Income Tax Expense (Benefit)		31.6		27.3
Net Income (Loss)		112.5		120.2
Appalachian Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		914.5		847.1
Appalachian Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		3.6		3.3
TOTAL REVENUES		0.0	[4]	0.1	[5]
Appalachian Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		339.7		270.5
Indiana Michigan Power Co [Member]
Revenues
Sales to AEP Affiliates		1.2		2.0
Other Revenues - Affiliated		15.9		8.4
TOTAL REVENUES		663.0		625.2
Expenses
Purchased Electricity from AEP Affiliates		45.1		57.1
Other Operation		169.7		139.3
Maintenance		58.6		51.0
Depreciation and Amortization		125.2		134.9
Taxes Other Than Income Taxes		19.5		25.2
TOTAL EXPENSES		517.3		513.2
OPERATING INCOME (LOSS)		145.7		112.0
Other Income (Expense):
Other Income		0.6		2.6
Allowance for Equity Funds Used During Construction		0.5		2.9
Non-Service Cost Components of Net Periodic Benefit Cost		8.0		6.3
Interest Expense		(33.2)		(30.3)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		121.1		90.6
Income Tax Expense (Benefit)		18.3		1.1
Net Income (Loss)		102.8		89.5
Indiana Michigan Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		642.8		612.0
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		3.1		2.8
Sales to AEP Affiliates				10.0
TOTAL REVENUES		0.0	[4]	(0.1)	[5]
Indiana Michigan Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		99.2		105.7
Ohio Power Co [Member]
Revenues
Sales to AEP Affiliates		7.6		3.7
TOTAL REVENUES		1,034.6		830.0
Expenses
Purchased Electricity from AEP Affiliates		0.0		6.3
Other Operation		273.8		237.6
Maintenance		44.3		40.4
Depreciation and Amortization		75.2		74.9
Taxes Other Than Income Taxes		135.3		127.0
TOTAL EXPENSES		921.2		712.5
OPERATING INCOME (LOSS)		113.4		117.5
Other Income (Expense):
Interest Income		0.1		0.1
Carrying Costs Income		0.0		0.1
Allowance for Equity Funds Used During Construction		2.8		3.0
Non-Service Cost Components of Net Periodic Benefit Cost		6.5		5.5
Interest Expense		(31.1)		(29.2)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		91.7		97.0
Income Tax Expense (Benefit)		13.7		13.8
Net Income (Loss)		78.0		83.2
Ohio Power Co [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		1,021.8		824.2
Ohio Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		5.2		2.1
TOTAL REVENUES		11.1	[4]	6.3	[5]
Ohio Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold		392.6		226.3
Public Service Co Of Oklahoma [Member]
Revenues
Sales to AEP Affiliates		0.7		0.6
TOTAL REVENUES		417.0		387.6
Expenses
Other Operation		92.1		88.8
Maintenance		28.8		25.4
Depreciation and Amortization		61.1		52.7
Taxes Other Than Income Taxes		17.3		14.2
TOTAL EXPENSES		399.4		369.8
OPERATING INCOME (LOSS)		17.6		17.8
Other Income (Expense):
Interest Income		1.0		1.7
Allowance for Equity Funds Used During Construction		1.5		1.1
Non-Service Cost Components of Net Periodic Benefit Cost		3.6		3.1
Interest Expense		(25.2)		(18.9)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		(1.5)		4.8
Income Tax Expense (Benefit)		0.8		(1.0)
Net Income (Loss)		(2.3)		5.8
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		414.8		386.4
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		1.5		0.6
TOTAL REVENUES		0.0	[4]	0.0	[5]
Public Service Co Of Oklahoma [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		200.1		188.7
Southwestern Electric Power Co [Member]
Revenues
Sales to AEP Affiliates		11.7		10.0
TOTAL REVENUES		515.9		494.8
Expenses
Other Operation		99.2		91.5
Maintenance		37.7		30.1
Depreciation and Amortization		80.4		77.8
Taxes Other Than Income Taxes		36.1		29.8
TOTAL EXPENSES		462.7		427.4
OPERATING INCOME (LOSS)		53.2		67.4
Other Income (Expense):
Interest Income		5.4		3.6
Allowance for Equity Funds Used During Construction		0.5		1.6
Non-Service Cost Components of Net Periodic Benefit Cost		3.4		3.1
Interest Expense		(25.0)		(33.1)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		37.5		42.6
Income Tax Expense (Benefit)		(4.0)		(2.2)
Equity Earnings (Loss) of Unconsolidated Subsidiaries		0.3		0.3
Net Income (Loss)		41.8		45.1
Net Income (Loss) Attributable to Noncontrolling Interests		1.2		1.0
Earnings Attributable to Common Shareholders		40.6		44.1
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		503.7		484.2
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.5		0.6
TOTAL REVENUES		0.0	[4]	0.0	[5]
Southwestern Electric Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		209.3		198.2
Reconciling Adjustments [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0
Sales to AEP Affiliates		(443.7)		(392.2)
TOTAL REVENUES		(443.7)		(392.2)
Other Income (Expense):
Net Income (Loss)		0.0		0.0
Reconciling Adjustments [Member] | Other Revenues [Member]
Revenues
TOTAL REVENUES		(0.9)	[1]	(2.9)	[2],[3]
Reconciling Adjustments [Member] | AEP Transmission Co [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0
Sales to AEP Affiliates		0.0		0.0
TOTAL REVENUES		0.0		0.0
Other Income (Expense):
Net Income (Loss)		0.0		0.0
Competitive Contracted Renewable Portfolio
Expenses
Asset Impairments and Other Related Charges		$ 112.0		$ 0.0

[1] Amounts include affiliated and nonaffiliated revenues.

[2] Amounts include affiliated and nonaffiliated revenues

[3] Generation & Marketing includes economic hedge activity.

[4] Amounts include affiliated and nonaffiliated revenues.

[5] Amounts include affiliated and nonaffiliated revenues.

[6] Includes the elimination of AEPTCo Parent’s equity earnings in the State Transcos.