Consolidated Statements of Income - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2024		Sep. 30, 2023		Sep. 30, 2024		Sep. 30, 2023
Revenues
Revenue from Contracts with Customers		$ 5,420.1		$ 5,341.7		$ 15,025.0		$ 14,405.1
TOTAL REVENUES		5,420.1		5,341.7		15,025.0		14,405.1
Expenses
Other Operation		805.8		719.9		2,385.4		2,031.1
Maintenance		343.7		325.5		1,012.7		982.8
Asset Impairments and Other Related Charges		0.0		0.0		142.5		0.0
Depreciation and Amortization		852.7		792.3		2,461.7		2,309.4
Taxes Other Than Income Taxes		407.2		393.9		1,211.2		1,149.2
TOTAL EXPENSES		4,068.6		3,988.4		11,817.0		11,472.3
OPERATING INCOME (LOSS)		1,351.5		1,353.3		3,208.0		2,932.8
Other Income (Expense):
Other Income		28.5		11.9		55.2		41.0
Allowance for Equity Funds Used During Construction		54.2		51.1		153.0		123.4
Non-Service Cost Components of Net Periodic Benefit Cost		46.5		55.2		129.0		165.9
Interest Expense, Operating and Nonoperating		(498.8)		(470.3)		(1,400.0)		(1,346.0)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		981.9		1,001.2		2,145.2		1,917.1
Income Tax Expense (Benefit)		37.5		64.2		(97.7)		103.2
Equity Earnings (Loss) of Unconsolidated Subsidiaries		17.3		21.3		67.0		60.9
Net Income (Loss)		961.7		958.3		2,309.9		1,874.8
Net Income (Loss) Attributable to Noncontrolling Interests		2.1		4.6		6.9		2.9
Earnings Attributable to Common Shareholders		$ 959.6		$ 953.7		$ 2,303.0		$ 1,871.9
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding		532,208,876		520,459,880		529,230,818		516,528,239
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 1.80		$ 1.83		$ 4.35		$ 3.62
Weighted Average Number of Diluted AEP Common Shares Outstanding		533,600,842		521,444,125		530,456,985		517,784,726
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 1.80		$ 1.83		$ 4.34		$ 3.62
Common Stock, Dividends Per Share, Declared		$ 0.88		$ 0.83
Acquisition Of Nuclear Fuel Included In Current Liabilities						$ 8.2		$ 9.5
Cash Flow Hedges, Tax		$ (12.3)		$ (0.3)		(8.0)		(31.5)
Amortization of Pension and OPEB Deferred Costs, Tax		(0.1)		(0.8)		(0.3)		(5.9)
Net Income (Loss)		961.7		958.3		2,309.9		1,874.8
Competitive Contracted Renewable Portfolio
Expenses
Asset Impairments and Other Related Charges		0.0		0.0		0.0		112.0
Related Party
Revenues
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		3,248.8		3,158.1		8,722.0		8,603.4
Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		1,568.5		1,535.2		4,480.5		4,321.3
Generation and Marketing [Member]
Revenues
Revenue from Contracts with Customers		483.7		527.5		1,442.1		1,172.6
Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		119.1		120.9		380.4		307.8
TOTAL REVENUES		(62.8)	[1],[2]	8.5	[3],[4]	(166.4)	[5],[6]	(250.2)	[7],[8]
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		1,659.2		1,756.8		4,603.5		4,887.8
AEP Texas Inc. [Member]
Revenues
TOTAL REVENUES		571.2		554.6		1,577.2		1,445.3
Expenses
Other Operation		164.7		154.4		453.3		395.2
Maintenance		22.5		25.0		66.3		75.7
Depreciation and Amortization		126.7		125.6		368.3		351.5
Taxes Other Than Income Taxes		44.8		48.6		125.4		136.9
TOTAL EXPENSES		358.7		353.6		1,013.3		959.3
OPERATING INCOME (LOSS)		212.5		201.0		563.9		486.0
Other Income (Expense):
Interest Income		3.1		0.5		5.7		1.5
Allowance for Equity Funds Used During Construction		10.5		7.8		34.6		19.4
Non-Service Cost Components of Net Periodic Benefit Cost		3.7		4.8		10.8		14.4
Interest Expense, Operating and Nonoperating		(67.7)		(59.9)		(188.5)		(173.1)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		162.1		154.2		426.5		348.2
Income Tax Expense (Benefit)		29.6		28.7		85.9		66.0
Net Income (Loss)		132.5		125.5		340.6		282.2
Earnings Per Share
Cash Flow Hedges, Tax		0.0		0.0		1.6		0.8
Amortization of Pension and OPEB Deferred Costs, Tax		0.0		0.0		0.0		(0.1)
AEP Texas Inc. [Member] | Related Party
Revenues
Revenue from Contracts with Customers		1.3		1.2		4.0		3.7
AEP Texas Inc. [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		569.2		551.6		1,569.9		1,438.7
AEP Texas Inc. [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.7		1.8		3.3		2.9
TOTAL REVENUES		0.0	[9]	0.0	[10]	0.0	[11]	0.0	[12]
AEP Transmission Co [Member]
Revenues
Provision for Refund Affiliated		(8.5)		(4.8)		(31.1)		(17.9)
Provision for Refund-Nonaffiliated		(2.2)		(1.0)		(3.9)		(4.8)
TOTAL REVENUES		497.2		462.7		1,455.2		1,349.2
Expenses
Other Operation		31.7		31.6		101.6		87.0
Maintenance		5.7		5.1		16.0		14.3
Depreciation and Amortization		108.2		99.6		320.8		291.2
Taxes Other Than Income Taxes		79.7		73.8		228.6		216.6
TOTAL EXPENSES		225.3		210.1		667.0		609.1
OPERATING INCOME (LOSS)		271.9		252.6		788.2		740.1
Other Income (Expense):
Interest Income		3.1		1.6		9.3		5.7
Allowance for Equity Funds Used During Construction		24.3		22.7		64.7		62.2
Interest Expense, Operating and Nonoperating		(54.3)		(51.6)		(160.5)		(147.5)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		245.0		225.3		701.7		660.5
Income Tax Expense (Benefit)		53.7		46.1		153.5		142.9
Net Income (Loss)		191.3		179.2		548.2		517.6
Earnings Per Share
Revenues from Related Parties, Net of Provisions for Refund		395.9		369.9		1,157.1		1,080.0
AEP Transmission Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		404.4		374.7		1,188.2		1,097.9
AEP Transmission Co [Member] | AEPTCo Parent [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
TOTAL REVENUES		0.0		0.0		0.0		0.0
Other Income (Expense):
Net Income (Loss)	[13]	0.5		1.0		0.5		3.6
AEP Transmission Co [Member] | AEPTCo Parent [Member] | Related Party
Revenues
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
AEP Transmission Co [Member] | State Transcos [Member]
Revenues
TOTAL REVENUES		497.2		462.7		1,455.2		1,349.2
Other Income (Expense):
Net Income (Loss)		190.8		178.2		547.7		514.0
AEP Transmission Co [Member] | State Transcos [Member] | Related Party
Revenues
Revenue from Contracts with Customers		395.9		369.9		1,157.1		1,080.0
AEP Transmission Co [Member] | Transmission [Member]
Revenues
Revenue from Contracts with Customers		103.3		93.8		299.0		274.0
Earnings Per Share
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax		101.1		92.8		295.1		269.2
AEP Transmission Co [Member] | Transmission [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers		101.1		92.8		295.1		269.2
AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.2		0.0		3.0		0.0
TOTAL REVENUES		0.0	[9]	0.0	[10]	0.0	[11]	0.0	[12]
Earnings Per Share
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax		0.2				3.0
AEP Transmission Co [Member] | Other Revenues [Member] | AEPTCo Parent [Member]
Revenues
Revenue from Contracts with Customers		0.0				0.0
AEP Transmission Co [Member] | Other Revenues [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers		0.2				3.0
Appalachian Power Co [Member]
Revenues
TOTAL REVENUES		1,028.9		961.8		3,032.1		2,776.0
Expenses
Other Operation		204.2		187.9		628.8		569.6
Maintenance		86.4		74.3		244.7		222.5
Depreciation and Amortization		149.0		143.7		444.5		424.8
Taxes Other Than Income Taxes		44.3		43.5		132.5		126.5
TOTAL EXPENSES		842.3		792.6		2,510.5		2,304.2
OPERATING INCOME (LOSS)		186.6		169.2		521.6		471.8
Other Income (Expense):
Interest Income		1.8		0.8		3.8		2.2
Allowance for Equity Funds Used During Construction		4.2		3.6		11.4		8.7
Non-Service Cost Components of Net Periodic Benefit Cost		6.9		8.1		20.4		24.4
Interest Expense, Operating and Nonoperating		(67.2)		(68.5)		(203.4)		(200.7)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		132.3		113.2		353.8		306.4
Income Tax Expense (Benefit)		22.5		21.3		49.2		59.1
Net Income (Loss)		109.8		91.9		304.6		247.3
Earnings Per Share
Cash Flow Hedges, Tax		(0.1)		(0.1)		(0.2)		(0.2)
Amortization of Pension and OPEB Deferred Costs, Tax		(0.1)		(0.2)		(0.2)		(0.6)
Appalachian Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		65.2		62.5		183.1		193.2
Appalachian Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		960.6		896.0		2,836.6		2,573.0
Appalachian Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		3.1		3.3		12.4		9.8
TOTAL REVENUES		0.1	[9]	0.1	[10]	0.2	[11]	0.1	[12]
Appalachian Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		358.4		343.2		1,060.0		960.8
Indiana Michigan Power Co [Member]
Revenues
TOTAL REVENUES		733.5		676.3		1,995.2		1,938.5
Expenses
Purchased Electricity from AEP Affiliates		63.0		57.0		169.0		139.2
Other Operation		180.0		168.9		548.5		508.7
Maintenance		58.1		57.3		173.7		173.0
Asset Impairments and Other Related Charges		0.0		0.0		13.4		0.0
Depreciation and Amortization		132.6		116.7		359.2		352.9
Taxes Other Than Income Taxes		21.0		22.3		68.9		62.4
TOTAL EXPENSES		572.9		551.5		1,659.6		1,558.6
OPERATING INCOME (LOSS)		160.6		124.8		335.6		379.9
Other Income (Expense):
Other Income		3.3		4.5		9.7		8.1
Allowance for Equity Funds Used During Construction						10.1		6.6
Non-Service Cost Components of Net Periodic Benefit Cost		6.8		7.7		20.0		23.4
Interest Expense, Operating and Nonoperating		(35.7)		(33.0)		(98.9)		(102.0)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		135.0		104.0		266.4		309.4
Income Tax Expense (Benefit)		(44.1)		11.0		(92.9)		38.8
Net Income (Loss)		179.1		93.0		359.3		270.6
Earnings Per Share
Acquisition Of Nuclear Fuel Included In Current Liabilities						8.2		9.5
Cash Flow Hedges, Tax		0.0		0.1		0.1		(0.1)
Amortization of Pension and OPEB Deferred Costs, Tax		0.0		0.0		0.0		(0.6)
Indiana Michigan Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		1.3		0.6		5.2		3.7
Indiana Michigan Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		714.9		656.1		1,932.3		1,879.3
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.1		4.2		7.0		9.7
TOTAL REVENUES		(1.2)	[9]	2.1	[10]	(22.7)	[11]	2.1	[12]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Revenues
Revenue from Contracts with Customers		15.2		15.4		50.7		45.8
Indiana Michigan Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		118.2		129.3		326.9		322.4
Ohio Power Co [Member]
Revenues
TOTAL REVENUES		1,004.2		989.5		2,924.3		2,903.2
Expenses
Other Operation		343.2		296.9		920.2		836.1
Maintenance		66.3		62.2		194.7		157.7
Asset Impairments and Other Related Charges		0.0		0.0		52.9		0.0
Depreciation and Amortization		86.1		81.3		293.9		224.7
Taxes Other Than Income Taxes		136.9		132.5		425.0		382.0
TOTAL EXPENSES		845.7		871.6		2,615.7		2,571.0
OPERATING INCOME (LOSS)		158.5		117.9		308.6		332.2
Other Income (Expense):
Other Income		0.9		0.1		1.0		0.4
Allowance for Equity Funds Used During Construction		6.4		5.6		16.2		11.3
Non-Service Cost Components of Net Periodic Benefit Cost		5.4		6.5		16.2		19.5
Interest Expense, Operating and Nonoperating		(38.7)		(33.9)		(109.9)		(96.9)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		132.5		96.2		232.1		266.5
Income Tax Expense (Benefit)		19.8		15.7		30.4		40.3
Net Income (Loss)		112.7		80.5		201.7		226.2
Ohio Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		5.6		7.8		17.0		23.6
Expenses
Purchased Electricity from AEP Affiliates		14.1		38.0		86.2		49.6
Ohio Power Co [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		995.8		978.7		2,899.0		2,869.3
Ohio Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.8		3.0		8.3		10.3
TOTAL REVENUES		3.3	[9]	3.0	[10]	15.2	[11]	20.1	[12]
Ohio Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		199.1		260.7		642.8		920.9
Public Service Co Of Oklahoma [Member]
Revenues
TOTAL REVENUES		615.4		644.2		1,462.0		1,535.9
Expenses
Other Operation		112.2		103.9		328.1		283.5
Maintenance		28.7		25.4		81.7		82.7
Depreciation and Amortization		70.6		61.8		202.1		187.8
Taxes Other Than Income Taxes		18.8		17.2		60.2		49.5
TOTAL EXPENSES		515.1		526.4		1,285.8		1,344.8
OPERATING INCOME (LOSS)		100.3		117.8		176.2		191.1
Other Income (Expense):
Interest Income		0.2		0.3		0.7		1.4
Allowance for Equity Funds Used During Construction		1.3		2.4		4.6		5.3
Non-Service Cost Components of Net Periodic Benefit Cost		2.9		3.6		8.5		10.7
Interest Expense, Operating and Nonoperating		(26.5)		(25.5)		(70.2)		(77.5)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		78.2		98.6		119.8		131.0
Income Tax Expense (Benefit)		(35.5)		(40.8)		(102.2)		(57.1)
Net Income (Loss)		113.7		139.4		222.0		188.1
Earnings Per Share
Cash Flow Hedges, Tax		(2.3)		0.0		(2.3)		(0.4)
Public Service Co Of Oklahoma [Member] | Related Party
Revenues
Revenue from Contracts with Customers		1.1		0.2		5.7		1.0
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		612.9		642.6		1,439.1		1,529.8
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		1.4		1.4		17.2		5.1
TOTAL REVENUES		0.0	[9]	0.0	[10]	0.0	[11]	0.0	[12]
Public Service Co Of Oklahoma [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		284.8		318.1		613.7		741.3
Southwestern Electric Power Co [Member]
Revenues
Provision for Refund		(8.9)		(0.1)		(189.0)		(4.2)
TOTAL REVENUES		638.8		654.8		1,550.8		1,708.5
Expenses
Other Operation		95.1		96.9		324.3		281.3
Maintenance		35.3		38.4		125.9		121.1
Depreciation and Amortization		117.7		100.6		297.6		266.8
Taxes Other Than Income Taxes		34.1		36.2		93.8		104.4
TOTAL EXPENSES		486.3		487.5		1,423.7		1,388.2
OPERATING INCOME (LOSS)		152.5		167.3		127.1		320.3
Other Income (Expense):
Interest Income		3.1		4.1		11.4		14.8
Allowance for Equity Funds Used During Construction		2.9		4.3		9.7		7.3
Non-Service Cost Components of Net Periodic Benefit Cost		2.6		3.4		7.6		10.2
Interest Expense, Operating and Nonoperating		(31.9)		(42.1)		(75.1)		(107.2)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS		129.2		137.0		80.7		245.4
Income Tax Expense (Benefit)		(10.5)		(21.7)		(198.8)		(35.7)
Equity Earnings (Loss) of Unconsolidated Subsidiaries		0.4		0.3		1.1		1.0
Net Income (Loss)		140.1		159.0		280.6		282.1
Net Income (Loss) Attributable to Noncontrolling Interests		1.0		1.5		3.5		3.0
Earnings Attributable to Common Shareholders		139.1		157.5		277.1		279.1
Earnings Per Share
Cash Flow Hedges, Tax		(0.1)		0.0		(0.1)		0.1
Amortization of Pension and OPEB Deferred Costs, Tax		(0.1)		(0.1)		(0.1)		(0.3)
Southwestern Electric Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		21.9		14.4		52.3		45.7
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		625.1		640.0		1,680.5		1,665.2
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.7		0.5		7.0		1.8
TOTAL REVENUES		0.0	[9]	0.0	[10]	0.0	[11]	0.0	[12]
Southwestern Electric Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		204.1		215.4		582.1		614.6
Reconciling Adjustments [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
TOTAL REVENUES		(508.0)		(508.4)		(1,524.8)		(1,416.3)
Other Income (Expense):
Net Income (Loss)		0.0		0.0		0.0		0.0
Reconciling Adjustments [Member] | Related Party
Revenues
Revenue from Contracts with Customers	[14]	(508.0)		(508.4)		(1,524.8)		(1,416.3)
Reconciling Adjustments [Member] | Other Revenues [Member]
Revenues
TOTAL REVENUES		(0.7)	[1],[2]	(0.7)	[3],[4]	4.9	[5],[6]	(3.6)	[7],[8]
Reconciling Adjustments [Member] | AEP Transmission Co [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
TOTAL REVENUES		0.0		0.0		0.0		0.0
Other Income (Expense):
Net Income (Loss)		0.0		0.0		0.0		0.0
Reconciling Adjustments [Member] | AEP Transmission Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		0.0		$ 0.0		0.0		$ 0.0
Reconciling Adjustments [Member] | AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		$ 0.0				$ 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] Generation & Marketing includes economic hedge activity.

[7] Generation & Marketing includes economic hedge activity.

[8] Amounts include affiliated and nonaffiliated revenues

[9] Amounts include affiliated and nonaffiliated revenues.

[10] Amounts include affiliated and nonaffiliated revenues.

[11] Amounts include affiliated and nonaffiliated revenues.

[12] Amounts include affiliated and nonaffiliated revenues.

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

[14] Represents inter-segment revenues.