Consolidated Statements of Income - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024		Mar. 31, 2023
Revenues
Revenue from Contracts with Customers		$ 5,025.7		$ 4,690.9
TOTAL REVENUES		5,025.7		4,690.9
Expenses
Other Operation		762.3		680.0
Maintenance		317.5		317.3
Depreciation and Amortization		787.1		775.5
Taxes Other Than Income Taxes		410.4		394.9
TOTAL EXPENSES		3,853.1		3,986.1
OPERATING INCOME (LOSS)		1,172.6		704.8
Other Income (Expense):
Other Income		13.6		14.7
Allowance for Equity Funds Used During Construction		43.6		31.3
Non-Service Cost Components of Net Periodic Benefit Cost		45.1		55.5
Interest Expense		(435.6)		(415.7)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		839.3		390.6
Income Tax Expense (Benefit)		(141.9)		10.4
Equity Earnings (Loss) of Unconsolidated Subsidiaries		24.5		20.2
Net Income (Loss)		1,005.7		400.4
Net Income (Loss) Attributable to Noncontrolling Interests		2.6		3.4
Earnings Attributable to Common Shareholders		$ 1,003.1		$ 397.0
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding		526,552,036		514,176,648
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 1.91		$ 0.77
Weighted Average Number of Diluted AEP Common Shares Outstanding		527,596,395		515,598,090
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 1.90		$ 0.77
Common Stock, Dividends Per Share, Declared		$ 0.88		$ 0.83
Cash Flow Hedges, Tax		$ (1.6)		$ (40.5)
Amortization of Pension and OPEB Deferred Costs, Tax		(0.2)		(4.3)
Competitive Contracted Renewable Portfolio
Expenses
Asset Impairments and Other Related Charges		0.0		112.0
Related Party
Revenues
Revenue from Contracts with Customers		0.0		0.0
Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		2,901.2		2,816.3
Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		1,483.2		1,455.3
Generation and Marketing [Member]
Revenues
Revenue from Contracts with Customers		515.9		326.9
Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		125.4		92.4
TOTAL REVENUES		(60.8)	[1],[2]	(129.9)	[3],[4]
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		1,575.8		1,706.4
AEP Texas Inc. [Member]
Revenues
TOTAL REVENUES		466.4		429.5
Expenses
Other Operation		140.8		146.9
Maintenance		22.1		24.4
Depreciation and Amortization		116.7		111.0
Taxes Other Than Income Taxes		40.0		43.5
TOTAL EXPENSES		319.6		325.8
OPERATING INCOME (LOSS)		146.8		103.7
Other Income (Expense):
Interest Income		0.5		0.4
Allowance for Equity Funds Used During Construction		8.6		6.3
Non-Service Cost Components of Net Periodic Benefit Cost		3.7		4.8
Interest Expense		(61.5)		(56.9)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		98.1		58.3
Income Tax Expense (Benefit)		18.4		10.7
Net Income (Loss)		79.7		47.6
Earnings Per Share
Cash Flow Hedges, Tax		1.0		0.0
Amortization of Pension and OPEB Deferred Costs, Tax		0.0		(0.1)
AEP Texas Inc. [Member] | Related Party
Revenues
Revenue from Contracts with Customers		1.3		1.2
AEP Texas Inc. [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		463.0		427.7
AEP Texas Inc. [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.1		0.6
TOTAL REVENUES		0.0	[5]	0.0	[6]
AEP Transmission Co [Member]
Revenues
Provision for Refund Affiliated		(6.0)		(4.8)
Provision for Refund-Nonaffiliated		(1.4)		(1.0)
TOTAL REVENUES		482.8		441.6
Expenses
Other Operation		29.9		29.0
Maintenance		5.3		4.9
Depreciation and Amortization		105.9		95.2
Taxes Other Than Income Taxes		73.4		74.8
TOTAL EXPENSES		214.5		203.9
OPERATING INCOME (LOSS)		268.3		237.7
Other Income (Expense):
Interest Income		1.9		1.5
Allowance for Equity Funds Used During Construction		17.9		16.4
Interest Expense		(54.8)		(45.2)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		233.3		210.4
Income Tax Expense (Benefit)		52.1		47.7
Net Income (Loss)		181.2		162.7
Earnings Per Share
Revenues from Related Parties, Net of Provisions for Refund		383.4		352.6
AEP Transmission Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		389.4		357.4
AEP Transmission Co [Member] | AEPTCo Parent [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0
TOTAL REVENUES		0.0		0.0
Other Income (Expense):
Net Income (Loss)	[7]	(0.5)		1.1
AEP Transmission Co [Member] | AEPTCo Parent [Member] | Related Party
Revenues
Revenue from Contracts with Customers		0.0		0.0
AEP Transmission Co [Member] | State Transcos [Member]
Revenues
TOTAL REVENUES		482.8		441.6
Other Income (Expense):
Net Income (Loss)		181.7		161.6
AEP Transmission Co [Member] | State Transcos [Member] | Related Party
Revenues
Revenue from Contracts with Customers		383.4		352.6
AEP Transmission Co [Member] | Transmission [Member]
Revenues
Revenue from Contracts with Customers		98.4		90.0
Earnings Per Share
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax		97.0		89.0
AEP Transmission Co [Member] | Transmission [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers		97.0		89.0
AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.4		0.0
TOTAL REVENUES		0.0	[5]	0.0	[6]
Earnings Per Share
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax		2.4
AEP Transmission Co [Member] | Other Revenues [Member] | AEPTCo Parent [Member]
Revenues
Revenue from Contracts with Customers		0.0
AEP Transmission Co [Member] | Other Revenues [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers		2.4
Appalachian Power Co [Member]
Revenues
TOTAL REVENUES		1,093.0		987.7
Expenses
Other Operation		212.6		191.8
Maintenance		80.0		73.1
Depreciation and Amortization		149.8		143.0
Taxes Other Than Income Taxes		46.0		41.8
TOTAL EXPENSES		885.2		789.4
OPERATING INCOME (LOSS)		207.8		198.3
Other Income (Expense):
Interest Income		0.8		0.6
Allowance for Equity Funds Used During Construction		2.9		2.4
Non-Service Cost Components of Net Periodic Benefit Cost		7.1		8.1
Interest Expense		(68.1)		(65.3)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		150.5		144.1
Income Tax Expense (Benefit)		14.0		31.6
Net Income (Loss)		136.5		112.5
Earnings Per Share
Cash Flow Hedges, Tax		(0.1)		(0.1)
Amortization of Pension and OPEB Deferred Costs, Tax		(0.1)		(0.2)
Appalachian Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		63.1		69.6
Appalachian Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		1,024.3		914.5
Appalachian Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		5.6		3.6
TOTAL REVENUES		0.1	[5]	0.0	[6]
Appalachian Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		396.8		339.7
Indiana Michigan Power Co [Member]
Revenues
TOTAL REVENUES		667.4		663.0
Expenses
Purchased Electricity from AEP Affiliates		61.5		45.1
Other Operation		178.2		169.7
Maintenance		52.4		58.6
Depreciation and Amortization		108.3		125.2
Taxes Other Than Income Taxes		23.3		19.5
TOTAL EXPENSES		546.3		517.3
OPERATING INCOME (LOSS)		121.1		145.7
Other Income (Expense):
Other Income		3.2		0.6
Allowance for Equity Funds Used During Construction		3.3		0.5
Non-Service Cost Components of Net Periodic Benefit Cost		6.7		8.0
Interest Expense		(26.2)		(33.2)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		104.8		121.1
Income Tax Expense (Benefit)		(40.2)		18.3
Net Income (Loss)		145.0		102.8
Earnings Per Share
Cash Flow Hedges, Tax		0.0		(0.2)
Amortization of Pension and OPEB Deferred Costs, Tax		0.0		(0.5)
Indiana Michigan Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		1.8		1.2
Indiana Michigan Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		647.8		642.8
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.8		3.1
TOTAL REVENUES		(25.9)	[5]	0.0	[6]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Revenues
Revenue from Contracts with Customers		15.0		15.9
Indiana Michigan Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		122.6		99.2
Ohio Power Co [Member]
Revenues
TOTAL REVENUES		1,023.8		1,034.6
Expenses
Purchased Electricity from AEP Affiliates		46.6		0.0
Other Operation		293.2		273.8
Maintenance		61.3		44.3
Depreciation and Amortization		105.8		75.2
Taxes Other Than Income Taxes		150.8		135.3
TOTAL EXPENSES		916.4		921.2
OPERATING INCOME (LOSS)		107.4		113.4
Other Income (Expense):
Other Income		0.0		0.1
Allowance for Equity Funds Used During Construction		5.5		2.8
Non-Service Cost Components of Net Periodic Benefit Cost		5.5		6.5
Interest Expense		(34.6)		(31.1)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		83.8		91.7
Income Tax Expense (Benefit)		13.2		13.7
Net Income (Loss)		70.6		78.0
Ohio Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		5.7		7.6
Ohio Power Co [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		1,015.4		1,021.8
Ohio Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.7		5.2
TOTAL REVENUES		7.9	[5]	11.1	[6]
Ohio Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		258.7		392.6
Public Service Co Of Oklahoma [Member]
Revenues
TOTAL REVENUES		387.8		417.0
Expenses
Other Operation		96.6		92.1
Maintenance		28.1		28.8
Depreciation and Amortization		67.4		61.1
Taxes Other Than Income Taxes		17.0		17.3
TOTAL EXPENSES		358.0		399.4
OPERATING INCOME (LOSS)		29.8		17.6
Other Income (Expense):
Interest Income		0.2		1.0
Allowance for Equity Funds Used During Construction		2.4		1.5
Non-Service Cost Components of Net Periodic Benefit Cost		2.9		3.6
Interest Expense		(16.8)		(25.2)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		18.5		(1.5)
Income Tax Expense (Benefit)		(53.5)		0.8
Net Income (Loss)		72.0		(2.3)
Earnings Per Share
Cash Flow Hedges, Tax		0.0		(0.4)
Public Service Co Of Oklahoma [Member] | Related Party
Revenues
Revenue from Contracts with Customers		3.5		0.7
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		378.1		414.8
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		6.2		1.5
TOTAL REVENUES		0.0	[5]	0.0	[6]
Public Service Co Of Oklahoma [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		148.9		200.1
Southwestern Electric Power Co [Member]
Revenues
TOTAL REVENUES		516.2		515.9
Expenses
Other Operation		112.9		99.2
Maintenance		37.2		37.7
Depreciation and Amortization		78.7		80.4
Taxes Other Than Income Taxes		34.2		36.1
TOTAL EXPENSES		447.6		462.7
OPERATING INCOME (LOSS)		68.6		53.2
Other Income (Expense):
Interest Income		4.0		5.4
Allowance for Equity Funds Used During Construction		3.4		0.5
Non-Service Cost Components of Net Periodic Benefit Cost		2.6		3.4
Interest Expense		(13.5)		(25.0)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		65.1		37.5
Income Tax Expense (Benefit)		(144.1)		(4.0)
Equity Earnings (Loss) of Unconsolidated Subsidiaries		0.4		0.3
Net Income (Loss)		209.6		41.8
Net Income (Loss) Attributable to Noncontrolling Interests		1.5		1.2
Earnings Attributable to Common Shareholders		208.1		40.6
Earnings Per Share
Cash Flow Hedges, Tax		0.0		0.1
Amortization of Pension and OPEB Deferred Costs, Tax		0.0		(0.1)
Southwestern Electric Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		12.1		11.7
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		500.2		503.7
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		3.9		0.5
TOTAL REVENUES		0.0	[5]	0.0	[6]
Southwestern Electric Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		184.6		209.3
Reconciling Adjustments [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0
TOTAL REVENUES		(526.0)		(443.7)
Other Income (Expense):
Net Income (Loss)		0.0		0.0
Reconciling Adjustments [Member] | Related Party
Revenues
Revenue from Contracts with Customers	[8]	(526.0)		(443.7)
Reconciling Adjustments [Member] | Other Revenues [Member]
Revenues
TOTAL REVENUES		8.0	[1],[2]	(0.9)	[3],[4]
Reconciling Adjustments [Member] | AEP Transmission Co [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0
TOTAL REVENUES		0.0		0.0
Other Income (Expense):
Net Income (Loss)		0.0		0.0
Reconciling Adjustments [Member] | AEP Transmission Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		0.0		$ 0.0
Reconciling Adjustments [Member] | AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		$ 0.0

[1] Amounts include affiliated and nonaffiliated revenues.

[2] Generation & Marketing includes economic hedge activity.

[3] Generation & Marketing includes economic hedge activity.

[4] Amounts include affiliated and nonaffiliated revenues

[5] Amounts include affiliated and nonaffiliated revenues.

[6] Amounts include affiliated and nonaffiliated revenues.

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

[8] Represents inter-segment revenues.