Consolidated Statements of Income - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2022		Sep. 30, 2021		Sep. 30, 2022		Sep. 30, 2021
Revenues
Revenue from Contracts with Customers		$ 5,526.1		$ 4,623.0		$ 14,758.4		$ 12,730.6
Sales to AEP Affiliates		0.0		0.0		0.0		0.0
TOTAL REVENUES		5,526.1		4,623.0		14,758.4		12,730.6
Expenses
Other Operation		797.0		735.3		2,079.0		1,894.6
Maintenance		298.1		277.8		909.6		817.0
Loss On Expected Sale Of KPCo		194.5		0.0		263.3		0.0
Asset Impairments and Other Related Charges		24.9		0.0		24.9		0.0
Establishment of Regulatory Asset		(37.0)		0.0		(37.0)		0.0
Gain on Sale of Mineral Rights		0.0		0.0		(116.3)		0.0
Depreciation and Amortization		821.8		700.3		2,416.8		2,103.9
Taxes Other Than Income Taxes		384.8		360.8		1,118.5		1,061.4
TOTAL EXPENSES		4,596.0		3,515.6		11,835.8		10,003.0
OPERATING INCOME (LOSS)		930.1		1,107.4		2,922.6		2,727.6
Other Income (Expense):
Other Income		4.8		(20.6)		(5.6)		34.2
Allowance for Equity Funds Used During Construction		35.6		37.0		95.2		103.9
Non-Service Cost Components of Net Periodic Benefit Cost		47.2		29.6		141.5		88.9
Interest Expense		(360.7)		(303.7)		(1,001.7)		(895.5)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		657.0		849.7		2,152.0		2,059.1
Income Tax Expense (Benefit)		(16.1)		69.8		90.7		185.5
Equity Earnings (Loss) of Unconsolidated Subsidiaries		10.2		17.0		(139.1)		75.9
Net Income (Loss)		683.3		796.9		1,922.2		1,949.5
Net Income (Loss) Attributable to Noncontrolling Interests		(0.4)		0.9		(0.7)		0.3
Earnings Attributable to Common Shareholders		$ 683.7		$ 796.0		$ 1,922.9		$ 1,949.2
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding		513,730,196		501,233,680		511,162,723		499,418,278
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 1.33		$ 1.59		$ 3.76		$ 3.90
Weighted Average Number of Diluted AEP Common Shares Outstanding		515,315,994		502,606,836		512,714,006		500,600,237
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 1.33		$ 1.58		$ 3.75		$ 3.89
Common Stock, Dividends Per Share, Declared		$ 0.78		$ 0.74
Cash Flow Hedges, Tax		$ (19.5)		$ 47.8		$ 81.6		$ 97.3
Amortization of Pension and OPEB Deferred Costs, Tax		(0.8)		(0.5)		(4.5)		(1.6)
Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		3,174.6		2,716.8		8,416.4		7,445.9
Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		1,525.5		1,195.0		4,064.5		3,366.9
Generation and Marketing [Member]
Revenues
Revenue from Contracts with Customers		733.1		617.4		1,997.0		1,641.6
Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		92.9		93.8		280.5		276.2
TOTAL REVENUES		128.3	[1]	154.8	[2],[3]	429.4	[4],[5]	188.7	[6],[7]
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		2,111.9		1,441.4		5,177.0		4,126.1
AEP Texas Inc. [Member]
Revenues
Sales to AEP Affiliates		0.9		0.9		2.6		2.9
TOTAL REVENUES		508.9		432.6		1,404.4		1,195.3
Expenses
Other Operation		163.8		135.3		431.6		367.1
Maintenance		22.7		22.0		70.1		59.8
Depreciation and Amortization		117.7		87.6		342.7		287.1
Taxes Other Than Income Taxes		45.5		41.6		125.8		117.4
TOTAL EXPENSES		349.7		286.5		970.2		831.4
OPERATING INCOME (LOSS)		159.2		146.1		434.2		363.9
Other Income (Expense):
Interest Income		1.3		0.2		2.7		0.6
Allowance for Equity Funds Used During Construction		5.2		9.2		13.2		16.7
Non-Service Cost Components of Net Periodic Benefit Cost		4.2		2.8		12.5		8.3
Interest Expense		(55.4)		(44.2)		(153.2)		(132.5)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		114.5		114.1		309.4		257.0
Income Tax Expense (Benefit)		20.9		14.6		56.2		31.6
Net Income (Loss)		93.6		99.5		253.2		225.4
Earnings Per Share
Cash Flow Hedges, Tax		0.1		0.1		0.2		0.2
Amortization of Pension and OPEB Deferred Costs, Tax		0.0		0.0		0.0		0.0
AEP Texas Inc. [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		507.7		430.8		1,399.3		1,189.1
AEP Texas Inc. [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.3		0.9		2.5		3.3
TOTAL REVENUES		0.0	[8]	0.0	[9]	0.0	[10]	0.0	[11]
AEP Transmission Co [Member]
Revenues
Revenue from Contracts with Customers								0.3
Sales to AEP Affiliates		340.6		297.7		999.5		882.3
Provision for Refund Affiliated		(9.3)		(0.1)		(65.7)		(17.7)
Provision for Refund-Nonaffiliated		(1.9)		0.0		(12.2)		(2.3)
TOTAL REVENUES		418.5		377.0		1,183.3		1,104.2
Expenses
Other Operation		39.6		32.6		94.7		78.1
Maintenance		4.1		5.4		11.2		12.3
Depreciation and Amortization		87.4		76.0		256.2		219.0
Taxes Other Than Income Taxes		68.7		61.0		203.0		178.9
TOTAL EXPENSES		199.8		175.0		565.1		488.3
OPERATING INCOME (LOSS)		218.7		202.0		618.2		615.9
Other Income (Expense):
Interest Income		0.7		0.2		1.0		0.4
Allowance for Equity Funds Used During Construction		20.3		16.0		51.2		49.3
Interest Expense		(42.7)		(36.1)		(119.7)		(104.5)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		197.0		182.1		550.7		561.1
Income Tax Expense (Benefit)		44.3		36.7		124.1		115.4
Net Income (Loss)		152.7		145.4		426.6		445.7
Earnings Per Share
Revenues from Related Parties, Net of Provisions for Refund		331.3		297.6		933.8		864.6
AEP Transmission Co [Member] | AEPTCo Parent [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Sales to AEP Affiliates		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]	0.1		0.1		0.2		0.2
AEP Transmission Co [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers								0.3
Sales to AEP Affiliates		331.3		297.6		933.8		864.6
TOTAL REVENUES		418.5		377.0		1,183.3		1,104.2
Other Income (Expense):
Net Income (Loss)		152.6		145.3		426.4		445.5
AEP Transmission Co [Member] | Transmission [Member]
Revenues
Revenue from Contracts with Customers		89.1		79.2		261.7		241.6
Earnings Per Share
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax		87.2		79.2		249.5		239.3
AEP Transmission Co [Member] | Transmission [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers		87.2		79.2		249.5		239.3
AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.2		0.0		0.3
TOTAL REVENUES		0.0	[8]	0.0	[9]	0.0	[10]	0.0	[11]
Appalachian Power Co [Member]
Revenues
Sales to AEP Affiliates		67.6		52.4		187.6		140.6
TOTAL REVENUES		888.9		804.0		2,569.8		2,298.0
Expenses
Other Operation		182.0		173.0		514.0		442.1
Maintenance		69.3		69.1		214.6		184.4
Asset Impairments and Other Related Charges		24.9		0.0		24.9		0.0
Establishment of Regulatory Asset		(37.0)		0.0		(37.0)		0.0
Depreciation and Amortization		142.9		135.4		431.0		406.6
Taxes Other Than Income Taxes		41.5		39.8		121.0		116.7
TOTAL EXPENSES		741.6		670.5		2,102.7		1,870.1
OPERATING INCOME (LOSS)		147.3		133.5		467.1		427.9
Other Income (Expense):
Interest Income		2.6		0.2		3.0		0.8
Allowance for Equity Funds Used During Construction		2.2		4.3		6.8		12.1
Non-Service Cost Components of Net Periodic Benefit Cost		7.3		4.7		21.8		14.2
Interest Expense		(61.7)		(52.8)		(171.1)		(160.6)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		97.7		89.9		327.6		294.4
Income Tax Expense (Benefit)		5.0		3.6		24.5		19.3
Net Income (Loss)		92.7		86.3		303.1		275.1
Earnings Per Share
Cash Flow Hedges, Tax		(0.1)		0.0		(0.2)		2.3
Amortization of Pension and OPEB Deferred Costs, Tax		(0.3)		(0.2)		(0.9)		(0.8)
Appalachian Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		818.4		748.5		2,370.4		2,149.2
Appalachian Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.9		3.1		11.8		8.2
TOTAL REVENUES		0.3	[8]	0.0	[9]	0.4	[10]	0.0	[11]
Appalachian Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		318.0		253.2		834.2		720.3
Indiana Michigan Power Co [Member]
Revenues
Sales to AEP Affiliates		2.0		1.1		11.1		2.6
Other Revenues - Affiliated		13.3		14.7		38.4		41.2
TOTAL REVENUES		715.4		635.7		1,971.6		1,784.0
Expenses
Purchased Electricity from AEP Affiliates		67.9		63.3		184.6		172.7
Other Operation		162.4		167.5		450.9		482.4
Maintenance		55.9		52.0		167.7		165.4
Depreciation and Amortization		131.6		110.6		400.2		328.7
Taxes Other Than Income Taxes		22.4		27.8		76.2		83.8
TOTAL EXPENSES		590.8		509.8		1,646.8		1,494.8
OPERATING INCOME (LOSS)		124.6		125.9		324.8		289.2
Other Income (Expense):
Other Income		2.4		2.5		7.4		8.9
Allowance for Equity Funds Used During Construction						7.9		9.7
Non-Service Cost Components of Net Periodic Benefit Cost		6.3		4.1		18.8		12.3
Interest Expense		(31.2)		(30.2)		(92.5)		(86.6)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		102.1		102.3		258.5		223.8
Income Tax Expense (Benefit)		8.0		(1.8)		7.7		(8.3)
Net Income (Loss)		94.1		104.1		250.8		232.1
Earnings Per Share
Cash Flow Hedges, Tax		0.1		0.1		0.3		0.3
Amortization of Pension and OPEB Deferred Costs, Tax		(0.1)		0.0		(0.1)		0.0
Indiana Michigan Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		695.7		618.2		1,912.1		1,735.1
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		4.4		1.7		10.0		5.1
Sales to AEP Affiliates		15.0		17.0		44.0		46.0
TOTAL REVENUES		0.0	[8]	0.0	[9]	(0.1)	[10]	0.0	[11]
Indiana Michigan Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		150.6		88.6		367.2		261.8
Ohio Power Co [Member]
Revenues
Sales to AEP Affiliates		4.0		4.3		11.6		21.9
TOTAL REVENUES		1,021.3		767.7		2,674.2		2,196.5
Expenses
Purchased Electricity from AEP Affiliates		0.0		3.5		9.8		48.0
Other Operation		267.3		245.1		728.2		622.9
Maintenance		47.8		39.3		136.7		116.4
Depreciation and Amortization		70.7		76.9		216.9		228.6
Taxes Other Than Income Taxes		131.0		126.0		379.0		366.2
TOTAL EXPENSES		916.3		675.5		2,345.6		1,895.7
OPERATING INCOME (LOSS)		105.0		92.2		328.6		300.8
Other Income (Expense):
Interest Income		0.2		0.2		0.8		0.5
Carrying Costs Income		0.0		0.1		0.2		1.1
Allowance for Equity Funds Used During Construction		3.9		2.0		10.3		7.6
Non-Service Cost Components of Net Periodic Benefit Cost		5.6		3.7		16.6		11.0
Interest Expense		(29.8)		(32.9)		(88.8)		(96.2)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		84.9		65.3		267.7		224.8
Income Tax Expense (Benefit)		13.0		8.9		38.6		26.2
Equity Earnings (Loss) of Unconsolidated Subsidiaries		0.0		0.0		0.8		0.0
Net Income (Loss)		71.9		56.4		229.9		198.6
Ohio Power Co [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		1,015.2		761.0		2,656.6		2,167.8
Ohio Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.1		2.4		6.0		6.8
TOTAL REVENUES		5.5	[8]	4.9	[9]	18.6	[10]	14.2	[11]
Ohio Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold		399.5		184.7		875.0		513.6
Public Service Co Of Oklahoma [Member]
Revenues
Sales to AEP Affiliates		0.7		1.0		2.1		3.1
TOTAL REVENUES		608.2		483.8		1,438.7		1,124.4
Expenses
Other Operation		116.3		102.3		301.0		262.7
Maintenance		31.3		21.2		88.0		68.1
Depreciation and Amortization		59.5		48.9		172.7		149.0
Taxes Other Than Income Taxes		15.6		12.1		43.6		37.1
TOTAL EXPENSES		516.3		380.4		1,279.5		957.7
OPERATING INCOME (LOSS)		91.9		103.4		159.2		166.7
Other Income (Expense):
Other Income		3.0		1.8		8.5		4.5
Non-Service Cost Components of Net Periodic Benefit Cost		3.1		2.1		9.4		6.4
Interest Expense		(22.4)		(16.2)		(62.6)		(44.7)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		75.6		91.1		114.5		132.9
Income Tax Expense (Benefit)		(31.3)		(2.1)		(41.2)		(3.7)
Net Income (Loss)		106.9		93.2		155.7		136.6
Earnings Per Share
Cash Flow Hedges, Tax		0.0		0.0		0.0		0.0
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		606.5		481.3		1,432.9		1,117.4
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		1.0		1.5		3.7		3.9
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		293.6		195.9		674.2		440.8
Southwestern Electric Power Co [Member]
Revenues
Sales to AEP Affiliates		18.2		13.5		43.7		32.2
TOTAL REVENUES		717.5		584.1		1,748.9		1,630.3
Expenses
Other Operation		114.1		91.7		308.7		270.6
Maintenance		32.9		33.7		107.8		99.5
Depreciation and Amortization		95.8		74.8		251.8		217.4
Taxes Other Than Income Taxes		34.2		28.9		94.9		89.0
TOTAL EXPENSES		567.9		443.5		1,432.3		1,329.2
OPERATING INCOME (LOSS)		149.6		140.6		316.6		301.1
Other Income (Expense):
Interest Income		2.7		2.8		13.9		6.9
Allowance for Equity Funds Used During Construction		1.0		1.4		3.4		5.4
Non-Service Cost Components of Net Periodic Benefit Cost		3.2		2.1		9.4		6.2
Interest Expense		(35.2)		(31.7)		(102.0)		(92.4)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		121.3		115.2		241.3		227.2
Income Tax Expense (Benefit)		(17.8)		6.3		(21.0)		19.0
Equity Earnings (Loss) of Unconsolidated Subsidiaries		0.3		1.0		1.0		2.5
Net Income (Loss)		139.4		109.9		263.3		210.7
Net Income (Loss) Attributable to Noncontrolling Interests		0.0		1.0		3.1		2.6
Earnings Attributable to Common Shareholders		139.4		108.9		260.2		208.1
Earnings Per Share
Cash Flow Hedges, Tax		0.0		0.1		0.0		0.3
Amortization of Pension and OPEB Deferred Costs, Tax		(0.1)		(0.1)		(0.3)		(0.3)
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		698.8		570.1		1,703.7		1,596.6
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.5		0.5		1.5		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		290.9		214.4		669.1		652.7
Mineral Rights
Expenses
Gain on Sale of Mineral Rights						(116.3)		0.0
Reconciling Adjustments [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Sales to AEP Affiliates		(425.0)		(376.0)		(1,190.5)		(1,112.2)
TOTAL REVENUES		(425.0)		(376.0)		(1,190.5)		(1,112.2)
Other Income (Expense):
Net Income (Loss)		0.0		0.0		0.0		0.0
Reconciling Adjustments [Member] | Other Revenues [Member]
Revenues
TOTAL REVENUES		(2.0)	[1]	(3.0)	[2],[3]	(6.9)	[4],[5]	(8.6)	[6],[7]
Reconciling Adjustments [Member] | AEP Transmission Co [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
Sales to AEP Affiliates		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

[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.