Consolidated Statements of Income - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022
Revenues
Revenue from Contracts with Customers		$ 5,341.7		$ 5,526.1		$ 14,405.1		$ 14,758.4
TOTAL REVENUES		5,341.7		5,526.1		14,405.1		14,758.4
Expenses
Other Operation		719.9		797.0		2,031.1		2,079.0
Maintenance		325.5		298.1		982.8		909.6
Asset Impairments and Other Related Charges		0.0		24.9		0.0		24.9
Establishment of Regulatory Asset		0.0		(37.0)		0.0		(37.0)
Depreciation and Amortization		792.3		821.8		2,309.4		2,416.8
Taxes Other Than Income Taxes		393.9		384.8		1,149.2		1,118.5
TOTAL EXPENSES		3,988.4		4,596.0		11,472.3		11,835.8
OPERATING INCOME (LOSS)		1,353.3		930.1		2,932.8		2,922.6
Other Income (Expense):
Other Income		11.9		4.8		41.0		(5.6)
Allowance for Equity Funds Used During Construction		51.1		35.6		123.4		95.2
Non-Service Cost Components of Net Periodic Benefit Cost		55.2		47.2		165.9		141.5
Interest Expense		(470.3)		(360.7)		(1,346.0)		(1,001.7)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		1,001.2		657.0		1,917.1		2,152.0
Income Tax Expense (Benefit)		64.2		(16.1)		103.2		90.7
Equity Earnings (Loss) of Unconsolidated Subsidiaries		21.3		10.2		60.9		(139.1)
Net Income (Loss)		958.3		683.3		1,874.8		1,922.2
Net Income (Loss) Attributable to Noncontrolling Interests		4.6		(0.4)		2.9		(0.7)
Earnings Attributable to Common Shareholders		$ 953.7		$ 683.7		$ 1,871.9		$ 1,922.9
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding		520,459,880		513,730,196		516,528,239		511,162,723
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 1.83		$ 1.33		$ 3.62		$ 3.76
Weighted Average Number of Diluted AEP Common Shares Outstanding		521,444,125		515,315,994		517,784,726		512,714,006
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 1.83		$ 1.33		$ 3.62		$ 3.75
Common Stock, Dividends Per Share, Declared		$ 0.83		$ 0.78
Acquisition Of Nuclear Fuel Included In Current Liabilities						$ 9.5		$ 8.5
Cash Flow Hedges, Tax		$ (0.3)		$ (19.5)		(31.5)		81.6
Amortization of Pension and OPEB Deferred Costs, Tax		(0.8)		(0.8)		(5.9)		(4.5)
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		3,158.1		3,174.6		8,603.4		8,416.4
Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		1,535.2		1,525.5		4,321.3		4,064.5
Generation and Marketing [Member]
Revenues
Revenue from Contracts with Customers		527.5		733.1		1,172.6		1,997.0
Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		120.9		92.9		307.8		280.5
TOTAL REVENUES		8.5	[1]	128.3	[2],[3]	(250.2)	[4],[5]	429.4	[6],[7]
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		1,756.8		2,111.9		4,887.8		5,177.0
AEP Texas Inc. [Member]
Revenues
TOTAL REVENUES		554.6		508.9		1,445.3		1,404.4
Expenses
Other Operation		154.4		163.8		395.2		431.6
Maintenance		25.0		22.7		75.7		70.1
Depreciation and Amortization		125.6		117.7		351.5		342.7
Taxes Other Than Income Taxes		48.6		45.5		136.9		125.8
TOTAL EXPENSES		353.6		349.7		959.3		970.2
OPERATING INCOME (LOSS)		201.0		159.2		486.0		434.2
Other Income (Expense):
Interest Income		0.5		1.3		1.5		2.7
Allowance for Equity Funds Used During Construction		7.8		5.2		19.4		13.2
Non-Service Cost Components of Net Periodic Benefit Cost		4.8		4.2		14.4		12.5
Interest Expense		(59.9)		(55.4)		(173.1)		(153.2)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		154.2		114.5		348.2		309.4
Income Tax Expense (Benefit)		28.7		20.9		66.0		56.2
Net Income (Loss)		125.5		93.6		282.2		253.2
Earnings Per Share
Cash Flow Hedges, Tax		0.0		0.1		0.8		0.2
Amortization of Pension and OPEB Deferred Costs, Tax		0.0		0.0		(0.1)		0.0
AEP Texas Inc. [Member] | Related Party
Revenues
Revenue from Contracts with Customers		1.2		0.9		3.7		2.6
AEP Texas Inc. [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		551.6		507.7		1,438.7		1,399.3
AEP Texas Inc. [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		1.8		0.3		2.9		2.5
TOTAL REVENUES		0.0	[8]	0.0	[9]	0.0	[10]	0.0	[11]
AEP Transmission Co [Member]
Revenues
Provision for Refund Affiliated		(4.8)		(9.3)		(17.9)		(65.7)
Provision for Refund-Nonaffiliated		(1.0)		(1.9)		(4.8)		(12.2)
TOTAL REVENUES		462.7		418.5		1,349.2		1,183.3
Expenses
Other Operation		31.6		39.6		87.0		94.7
Maintenance		5.1		4.1		14.3		11.2
Depreciation and Amortization		99.6		87.4		291.2		256.2
Taxes Other Than Income Taxes		73.8		68.7		216.6		203.0
TOTAL EXPENSES		210.1		199.8		609.1		565.1
OPERATING INCOME (LOSS)		252.6		218.7		740.1		618.2
Other Income (Expense):
Interest Income		1.6		0.7		5.7		1.0
Allowance for Equity Funds Used During Construction		22.7		20.3		62.2		51.2
Interest Expense		(51.6)		(42.7)		(147.5)		(119.7)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		225.3		197.0		660.5		550.7
Income Tax Expense (Benefit)		46.1		44.3		142.9		124.1
Net Income (Loss)		179.2		152.7		517.6		426.6
Earnings Per Share
Revenues from Related Parties, Net of Provisions for Refund		369.9		331.3		1,080.0		933.8
AEP Transmission Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		374.7		340.6		1,097.9		999.5
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)	[12]	1.0		0.1		3.6		0.2
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		462.7		418.5		1,349.2		1,183.3
Other Income (Expense):
Net Income (Loss)		178.2		152.6		514.0		426.4
AEP Transmission Co [Member] | State Transcos [Member] | Related Party
Revenues
Revenue from Contracts with Customers		369.9		331.3		1,080.0		933.8
AEP Transmission Co [Member] | Transmission [Member]
Revenues
Revenue from Contracts with Customers		93.8		89.1		274.0		261.7
Earnings Per Share
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax		92.8		87.2		269.2		249.5
AEP Transmission Co [Member] | Transmission [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers		92.8		87.2		269.2		249.5
AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
TOTAL REVENUES		0.0	[8]	0.0	[9]	0.0	[10]	0.0	[11]
Appalachian Power Co [Member]
Revenues
TOTAL REVENUES		961.8		888.9		2,776.0		2,569.8
Expenses
Other Operation		187.9		182.0		569.6		514.0
Maintenance		74.3		69.3		222.5		214.6
Asset Impairments and Other Related Charges		0.0		24.9		0.0		24.9
Establishment of Regulatory Asset		0.0		(37.0)		0.0		(37.0)
Depreciation and Amortization		143.7		142.9		424.8		431.0
Taxes Other Than Income Taxes		43.5		41.5		126.5		121.0
TOTAL EXPENSES		792.6		741.6		2,304.2		2,102.7
OPERATING INCOME (LOSS)		169.2		147.3		471.8		467.1
Other Income (Expense):
Interest Income		0.8		2.6		2.2		3.0
Allowance for Equity Funds Used During Construction		3.6		2.2		8.7		6.8
Non-Service Cost Components of Net Periodic Benefit Cost		8.1		7.3		24.4		21.8
Interest Expense		(68.5)		(61.7)		(200.7)		(171.1)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		113.2		97.7		306.4		327.6
Income Tax Expense (Benefit)		21.3		5.0		59.1		24.5
Net Income (Loss)		91.9		92.7		247.3		303.1
Earnings Per Share
Cash Flow Hedges, Tax		(0.1)		(0.1)		(0.2)		(0.2)
Amortization of Pension and OPEB Deferred Costs, Tax		(0.2)		(0.3)		(0.6)		(0.9)
Appalachian Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		62.5		67.6		193.2		187.6
Appalachian Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		896.0		818.4		2,573.0		2,370.4
Appalachian Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		3.3		2.9		9.8		11.8
TOTAL REVENUES		0.1	[8]	0.3	[9]	0.1	[10]	0.4	[11]
Appalachian Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		343.2		318.0		960.8		834.2
Indiana Michigan Power Co [Member]
Revenues
TOTAL REVENUES		676.3		715.4		1,938.5		1,971.6
Expenses
Purchased Electricity from AEP Affiliates		57.0		67.9		139.2		184.6
Other Operation		168.9		162.4		508.7		450.9
Maintenance		57.3		55.9		173.0		167.7
Depreciation and Amortization		116.7		131.6		352.9		400.2
Taxes Other Than Income Taxes		22.3		22.4		62.4		76.2
TOTAL EXPENSES		551.5		590.8		1,558.6		1,646.8
OPERATING INCOME (LOSS)		124.8		124.6		379.9		324.8
Other Income (Expense):
Other Income		4.5		2.4		8.1		7.4
Allowance for Equity Funds Used During Construction						6.6		7.9
Non-Service Cost Components of Net Periodic Benefit Cost		7.7		6.3		23.4		18.8
Interest Expense		(33.0)		(31.2)		(102.0)		(92.5)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		104.0		102.1		309.4		258.5
Income Tax Expense (Benefit)		11.0		8.0		38.8		7.7
Net Income (Loss)		93.0		94.1		270.6		250.8
Earnings Per Share
Acquisition Of Nuclear Fuel Included In Current Liabilities						9.5		8.5
Cash Flow Hedges, Tax		0.1		0.1		(0.1)		0.3
Amortization of Pension and OPEB Deferred Costs, Tax		0.0		(0.1)		(0.6)		(0.1)
Indiana Michigan Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		0.6		2.0		3.7		11.1
Indiana Michigan Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		656.1		695.7		1,879.3		1,912.1
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		4.2		4.4		9.7		10.0
TOTAL REVENUES		2.1	[8]	0.0	[9]	2.1	[10]	(0.1)	[11]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Revenues
Revenue from Contracts with Customers		15.4		13.3		45.8		38.4
Indiana Michigan Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		129.3		150.6		322.4		367.2
Ohio Power Co [Member]
Revenues
TOTAL REVENUES		989.5		1,021.3		2,903.2		2,674.2
Expenses
Purchased Electricity from AEP Affiliates		38.0		0.0		49.6		9.8
Other Operation		296.9		267.3		836.1		728.2
Maintenance		62.2		47.8		157.7		136.7
Depreciation and Amortization		81.3		70.7		224.7		216.9
Taxes Other Than Income Taxes		132.5		131.0		382.0		379.0
TOTAL EXPENSES		871.6		916.3		2,571.0		2,345.6
OPERATING INCOME (LOSS)		117.9		105.0		332.2		328.6
Other Income (Expense):
Other Income		0.1		0.2		0.4		1.0
Allowance for Equity Funds Used During Construction		5.6		3.9		11.3		10.3
Non-Service Cost Components of Net Periodic Benefit Cost		6.5		5.6		19.5		16.6
Interest Expense		(33.9)		(29.8)		(96.9)		(88.8)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		96.2		84.9		266.5		267.7
Income Tax Expense (Benefit)		15.7		13.0		40.3		38.6
Equity Earnings (Loss) of Unconsolidated Subsidiaries		0.0		0.0		0.0		0.8
Net Income (Loss)		80.5		71.9		226.2		229.9
Ohio Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		7.8		4.0		23.6		11.6
Ohio Power Co [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		978.7		1,015.2		2,869.3		2,656.6
Ohio Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		3.0		2.1		10.3		6.0
TOTAL REVENUES		3.0	[8]	5.5	[9]	20.1	[10]	18.6	[11]
Ohio Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		260.7		399.5		920.9		875.0
Public Service Co Of Oklahoma [Member]
Revenues
TOTAL REVENUES		644.2		608.2		1,535.9		1,438.7
Expenses
Other Operation		103.9		116.3		283.5		301.0
Maintenance		25.4		31.3		82.7		88.0
Depreciation and Amortization		61.8		59.5		187.8		172.7
Taxes Other Than Income Taxes		17.2		15.6		49.5		43.6
TOTAL EXPENSES		526.4		516.3		1,344.8		1,279.5
OPERATING INCOME (LOSS)		117.8		91.9		191.1		159.2
Other Income (Expense):
Other Income		2.7		3.0		6.7		8.5
Non-Service Cost Components of Net Periodic Benefit Cost		3.6		3.1		10.7		9.4
Interest Expense		(25.5)		(22.4)		(77.5)		(62.6)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		98.6		75.6		131.0		114.5
Income Tax Expense (Benefit)		(40.8)		(31.3)		(57.1)		(41.2)
Net Income (Loss)		139.4		106.9		188.1		155.7
Earnings Per Share
Cash Flow Hedges, Tax		0.0		0.0		(0.4)		0.0
Public Service Co Of Oklahoma [Member] | Related Party
Revenues
Revenue from Contracts with Customers		0.2		0.7		1.0		2.1
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		642.6		606.5		1,529.8		1,432.9
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		1.4		1.0		5.1		3.7
TOTAL REVENUES		0.0	[8]	0.0	[9]	0.0	[10]	0.0	[11]
Public Service Co Of Oklahoma [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		318.1		293.6		741.3		674.2
Southwestern Electric Power Co [Member]
Revenues
TOTAL REVENUES		654.8		717.5		1,708.5		1,748.9
Expenses
Other Operation		96.9		114.1		281.3		308.7
Maintenance		38.4		32.9		121.1		107.8
Depreciation and Amortization		100.6		95.8		266.8		251.8
Taxes Other Than Income Taxes		36.2		34.2		104.4		94.9
TOTAL EXPENSES		487.5		567.9		1,388.2		1,432.3
OPERATING INCOME (LOSS)		167.3		149.6		320.3		316.6
Other Income (Expense):
Interest Income		4.1		2.7		14.8		13.9
Allowance for Equity Funds Used During Construction		4.3		1.0		7.3		3.4
Non-Service Cost Components of Net Periodic Benefit Cost		3.4		3.2		10.2		9.4
Interest Expense		(42.1)		(35.2)		(107.2)		(102.0)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		137.0		121.3		245.4		241.3
Income Tax Expense (Benefit)		(21.7)		(17.8)		(35.7)		(21.0)
Equity Earnings (Loss) of Unconsolidated Subsidiaries		0.3		0.3		1.0		1.0
Net Income (Loss)		159.0		139.4		282.1		263.3
Net Income (Loss) Attributable to Noncontrolling Interests		1.5		0.0		3.0		3.1
Earnings Attributable to Common Shareholders		157.5		139.4		279.1		260.2
Earnings Per Share
Cash Flow Hedges, Tax		0.0		0.0		0.1		0.0
Amortization of Pension and OPEB Deferred Costs, Tax		(0.1)		(0.1)		(0.3)		(0.3)
Southwestern Electric Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		14.5		18.2		40.7		43.7
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		639.8		698.8		1,666.0		1,703.7
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.5		0.5		1.8		1.5
TOTAL REVENUES		0.0	[8]	0.0	[9]	0.0	[10]	0.0	[11]
Southwestern Electric Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		215.4		290.9		614.6		669.1
Mineral Rights
Expenses
Gain on Sale of Mineral Rights		0.0		0.0		0.0		(116.3)
Reconciling Adjustments [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
TOTAL REVENUES		(508.4)		(425.0)		(1,416.3)		(1,190.5)
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		(508.4)		(425.0)		(1,416.3)		(1,190.5)
Reconciling Adjustments [Member] | Other Revenues [Member]
Revenues
TOTAL REVENUES		(0.7)	[1]	(2.0)	[2],[3]	(3.6)	[4],[5]	(6.9)	[6],[7]
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
Competitive Contracted Renewable Portfolio
Expenses
Asset Impairments and Other Related Charges		0.0		0.0		112.0		0.0
Kentucky Operations [Member]
Expenses
Asset Impairments and Other Related Charges		$ 0.0		$ 194.5		$ 0.0		$ 263.3

[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] Generation & Marketing includes economic hedge activity.

[6] Amounts include affiliated and nonaffiliated revenues

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