Consolidated Statements of Income - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2023		Jun. 30, 2022		Jun. 30, 2023		Jun. 30, 2022
Revenues
Revenue from Contracts with Customers		$ 4,372.5		$ 4,639.7		$ 9,063.4		$ 9,232.3
TOTAL REVENUES		4,372.5		4,639.7		9,063.4		9,232.3
Expenses
Other Operation		631.2		619.8		1,311.2		1,282.0
Maintenance		340.0		326.5		657.3		611.5
Loss On Expected Sale Of KPCo		0.0		68.8		0.0		68.8
Gain on Sale of Mineral Rights		0.0		(116.3)		0.0		(116.3)
Depreciation and Amortization		741.6		802.6		1,517.1		1,595.0
Taxes Other Than Income Taxes		360.4		369.5		755.3		733.7
TOTAL EXPENSES		3,497.8		3,635.3		7,483.9		7,239.8
OPERATING INCOME (LOSS)		874.7		1,004.4		1,579.5		1,992.5
Other Income (Expense):
Other Income		14.4		(12.7)		29.1		(10.4)
Allowance for Equity Funds Used During Construction		41.0		28.6		72.3		59.6
Non-Service Cost Components of Net Periodic Benefit Cost		55.2		47.1		110.7		94.3
Interest Expense		(460.0)		(327.6)		(875.7)		(641.0)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		525.3		739.8		915.9		1,495.0
Income Tax Expense (Benefit)		28.6		54.0		39.0		106.8
Equity Earnings (Loss) of Unconsolidated Subsidiaries		19.4		(165.0)		39.6		(149.3)
Net Income (Loss)		516.1		520.8		916.5		1,238.9
Net Income (Loss) Attributable to Noncontrolling Interests		(5.1)		(3.7)		(1.7)		(0.3)
Earnings Attributable to Common Shareholders		$ 521.2		$ 524.5		$ 918.2		$ 1,239.2
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding		514,879,144		513,623,431		514,529,837		509,857,710
Total Basic Earnings Per Share Attributable to AEP Common Shareholders		$ 1.01		$ 1.02		$ 1.78		$ 2.43
Weighted Average Number of Diluted AEP Common Shares Outstanding		516,242,919		515,162,210		515,922,446		511,391,735
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders		$ 1.01		$ 1.02		$ 1.78		$ 2.42
Common Stock, Dividends Per Share, Declared		$ 0.83		$ 0.78
Acquisition Of Nuclear Fuel Included In Current Liabilities						$ (36.0)		$ 0.0
Cash Flow Hedges, Tax		$ 9.3		$ 35.2		(31.2)		101.1
Amortization of Pension and OPEB Deferred Costs, Tax		(0.8)		(3.1)		(5.1)		(3.7)
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		2,629.0		2,595.0		5,445.3		5,241.8
Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		1,330.8		1,296.8		2,786.1		2,539.0
Generation and Marketing [Member]
Revenues
Revenue from Contracts with Customers		318.2		654.4		645.1		1,263.9
Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		94.5		93.5		186.9		187.6
TOTAL REVENUES		(128.8)	[1]	135.7	[2],[3]	(258.7)	[4],[5]	301.1	[6],[7]
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		1,424.6		1,564.4		3,131.0		3,065.1
AEP Texas Inc. [Member]
Revenues
TOTAL REVENUES		461.2		478.8		890.7		895.5
Expenses
Other Operation		93.9		142.0		240.8		267.8
Maintenance		26.3		24.8		50.7		47.4
Depreciation and Amortization		114.9		116.2		225.9		225.0
Taxes Other Than Income Taxes		44.8		43.0		88.3		80.3
TOTAL EXPENSES		279.9		326.0		605.7		620.5
OPERATING INCOME (LOSS)		181.3		152.8		285.0		275.0
Other Income (Expense):
Interest Income		0.6		1.3		1.0		1.4
Allowance for Equity Funds Used During Construction		5.3		3.7		11.6		8.0
Non-Service Cost Components of Net Periodic Benefit Cost		4.8		4.1		9.6		8.3
Interest Expense		(56.3)		(52.3)		(113.2)		(97.8)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		135.7		109.6		194.0		194.9
Income Tax Expense (Benefit)		26.6		19.6		37.3		35.3
Net Income (Loss)		109.1		90.0		156.7		159.6
Earnings Per Share
Cash Flow Hedges, Tax		0.8		0.0		0.8		0.1
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		1.3		0.8		2.5		1.7
AEP Texas Inc. [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		459.4		476.9		887.1		891.6
AEP Texas Inc. [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.5		1.1		1.1		2.2
TOTAL REVENUES		0.0	[8]	0.0	[9]	0.0	[10]	0.0	[11]
AEP Transmission Co [Member]
Revenues
Provision for Refund Affiliated		(8.3)		(46.8)		(13.1)		(56.4)
Provision for Refund-Nonaffiliated		(2.8)		(8.3)		(3.8)		(10.3)
TOTAL REVENUES		444.9		364.4		886.5		764.8
Expenses
Other Operation		26.4		29.6		55.4		55.1
Maintenance		4.3		3.8		9.2		7.1
Depreciation and Amortization		96.4		85.7		191.6		168.8
Taxes Other Than Income Taxes		68.0		68.7		142.8		134.3
TOTAL EXPENSES		195.1		187.8		399.0		365.3
OPERATING INCOME (LOSS)		249.8		176.6		487.5		399.5
Other Income (Expense):
Interest Income		2.6		0.2		4.1		0.3
Allowance for Equity Funds Used During Construction		23.1		15.3		39.5		30.9
Interest Expense		(50.7)		(39.3)		(95.9)		(77.0)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		224.8		152.8		435.2		353.7
Income Tax Expense (Benefit)		49.1		34.3		96.8		79.8
Net Income (Loss)		175.7		118.5		338.4		273.9
Earnings Per Share
Revenues from Related Parties, Net of Provisions for Refund		357.5		287.1		710.1		602.5
AEP Transmission Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		365.8		333.9		723.2		658.9
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)	[12]	1.5		0.1		2.6		0.1
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		444.9		364.4		886.5		764.8
Other Income (Expense):
Net Income (Loss)		174.2		118.4		335.8		273.8
AEP Transmission Co [Member] | State Transcos [Member] | Related Party
Revenues
Revenue from Contracts with Customers		357.5		287.1		710.1		602.5
AEP Transmission Co [Member] | Transmission [Member]
Revenues
Revenue from Contracts with Customers		90.2		85.6		180.2		172.6
Earnings Per Share
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax		87.4		77.3		176.4		162.3
AEP Transmission Co [Member] | Transmission [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers		87.4		77.3		176.4		162.3
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		826.5		773.6		1,814.2		1,680.9
Expenses
Other Operation		189.9		147.1		381.7		332.0
Maintenance		75.1		71.2		148.2		145.3
Depreciation and Amortization		138.1		142.9		281.1		288.1
Taxes Other Than Income Taxes		41.2		39.3		83.0		79.5
TOTAL EXPENSES		722.2		646.2		1,511.6		1,361.1
OPERATING INCOME (LOSS)		104.3		127.4		302.6		319.8
Other Income (Expense):
Interest Income		0.8		0.3		1.4		0.4
Allowance for Equity Funds Used During Construction		2.7		2.6		5.1		4.6
Non-Service Cost Components of Net Periodic Benefit Cost		8.2		7.2		16.3		14.5
Interest Expense		(66.9)		(55.1)		(132.2)		(109.4)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		49.1		82.4		193.2		229.9
Income Tax Expense (Benefit)		6.2		(7.8)		37.8		19.5
Net Income (Loss)		42.9		90.2		155.4		210.4
Earnings Per Share
Cash Flow Hedges, Tax		0.0		0.0		(0.1)		(0.1)
Amortization of Pension and OPEB Deferred Costs, Tax		(0.2)		(0.3)		(0.4)		(0.6)
Appalachian Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		61.1		63.1		130.7		120.0
Appalachian Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		762.5		704.9		1,677.0		1,552.0
Appalachian Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.9		5.6		6.5		8.9
TOTAL REVENUES		0.0	[8]	0.0	[9]	0.0	[10]	0.1	[11]
Appalachian Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		277.9		245.7		617.6		516.2
Indiana Michigan Power Co [Member]
Revenues
TOTAL REVENUES		599.2		631.0		1,262.2		1,256.2
Expenses
Purchased Electricity from AEP Affiliates		37.1		59.6		82.2		116.7
Other Operation		170.1		149.2		339.8		288.5
Maintenance		57.1		60.8		115.7		111.8
Depreciation and Amortization		111.0		133.7		236.2		268.6
Taxes Other Than Income Taxes		20.6		28.6		40.1		53.8
TOTAL EXPENSES		489.8		542.8		1,007.1		1,056.0
OPERATING INCOME (LOSS)		109.4		88.2		255.1		200.2
Other Income (Expense):
Other Income		3.0		2.4		3.6		5.0
Allowance for Equity Funds Used During Construction						2.8		5.4
Non-Service Cost Components of Net Periodic Benefit Cost		7.7		6.2		15.7		12.5
Interest Expense		(35.8)		(31.0)		(69.0)		(61.3)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		84.3		65.8		205.4		156.4
Income Tax Expense (Benefit)		9.5		(1.4)		27.8		(0.3)
Net Income (Loss)		74.8		67.2		177.6		156.7
Earnings Per Share
Acquisition Of Nuclear Fuel Included In Current Liabilities						(36.0)		0.0
Cash Flow Hedges, Tax		0.0		0.1		(0.2)		0.2
Amortization of Pension and OPEB Deferred Costs, Tax		(0.1)		0.0		(0.6)		0.0
Indiana Michigan Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		580.4		604.4		1,223.2		1,216.4
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.4		2.8		5.5		5.6
TOTAL REVENUES		0.0	[8]	0.0	[9]	0.0	[10]	(0.1)	[11]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party
Revenues
Revenue from Contracts with Customers				19.0		35.0		29.0
Indiana Michigan Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		93.9		110.9		193.1		216.6
Ohio Power Co [Member]
Revenues
TOTAL REVENUES		879.1		822.9		1,913.7		1,652.9
Expenses
Purchased Electricity from AEP Affiliates		11.6		3.5		11.6		9.8
Other Operation		265.4		223.3		539.2		460.9
Maintenance		51.2		48.5		95.5		88.9
Depreciation and Amortization		68.2		71.3		143.4		146.2
Taxes Other Than Income Taxes		114.2		121.0		249.5		248.0
TOTAL EXPENSES		778.2		716.8		1,699.4		1,429.3
OPERATING INCOME (LOSS)		100.9		106.1		214.3		223.6
Other Income (Expense):
Other Income		0.2		0.6		0.3		0.8
Allowance for Equity Funds Used During Construction		2.9		3.4		5.7		6.4
Non-Service Cost Components of Net Periodic Benefit Cost		6.5		5.5		13.0		11.0
Interest Expense		(31.9)		(29.8)		(63.0)		(59.0)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		78.6		85.8		170.3		182.8
Income Tax Expense (Benefit)		10.9		11.8		24.6		25.6
Equity Earnings (Loss) of Unconsolidated Subsidiaries		0.0		0.8		0.0		0.8
Net Income (Loss)		67.7		74.8		145.7		158.0
Ohio Power Co [Member] | Related Party
Revenues
Revenue from Contracts with Customers		8.2		3.9		15.8		7.6
Ohio Power Co [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers		868.8		817.2		1,890.6		1,641.4
Ohio Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.1		1.8		7.3		3.9
TOTAL REVENUES		6.0	[8]	6.8	[9]	17.1	[10]	13.1	[11]
Ohio Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold		267.6		249.2		660.2		475.5
Public Service Co Of Oklahoma [Member]
Revenues
TOTAL REVENUES		474.7		442.9		891.7		830.5
Expenses
Other Operation		87.5		95.9		179.6		184.7
Maintenance		28.5		31.3		57.3		56.7
Depreciation and Amortization		64.9		60.5		126.0		113.2
Taxes Other Than Income Taxes		15.0		13.8		32.3		28.0
TOTAL EXPENSES		419.0		393.4		818.4		763.2
OPERATING INCOME (LOSS)		55.7		49.5		73.3		67.3
Other Income (Expense):
Interest Income		0.1		2.5		1.1		4.2
Allowance for Equity Funds Used During Construction		1.4		0.2		2.9		1.3
Non-Service Cost Components of Net Periodic Benefit Cost		3.5		3.2		7.1		6.3
Interest Expense		(26.8)		(21.3)		(52.0)		(40.2)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		33.9		34.1		32.4		38.9
Income Tax Expense (Benefit)		(17.1)		(8.9)		(16.3)		(9.9)
Net Income (Loss)		51.0		43.0		48.7		48.8
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		0.1		0.8		0.8		1.4
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		472.4		440.0		887.2		826.4
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		2.2		2.1		3.7		2.7
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		223.1		191.9		423.2		380.6
Southwestern Electric Power Co [Member]
Revenues
TOTAL REVENUES		537.8		536.6		1,053.7		1,031.4
Expenses
Other Operation		85.2		103.1		184.4		194.6
Maintenance		45.0		44.8		82.7		74.9
Depreciation and Amortization		85.8		78.2		166.2		156.0
Taxes Other Than Income Taxes		32.1		30.9		68.2		60.7
TOTAL EXPENSES		438.0		437.0		900.7		864.4
OPERATING INCOME (LOSS)		99.8		99.6		153.0		167.0
Other Income (Expense):
Interest Income		5.3		7.6		10.7		11.2
Allowance for Equity Funds Used During Construction		2.5		0.8		3.0		2.4
Non-Service Cost Components of Net Periodic Benefit Cost		3.4		3.1		6.8		6.2
Interest Expense		(40.1)		(33.7)		(65.1)		(66.8)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS		70.9		77.4		108.4		120.0
Income Tax Expense (Benefit)		(10.0)		(1.0)		(14.0)		(3.2)
Equity Earnings (Loss) of Unconsolidated Subsidiaries		0.4		0.4		0.7		0.7
Net Income (Loss)		81.3		78.8		123.1		123.9
Net Income (Loss) Attributable to Noncontrolling Interests		0.3		2.1		1.5		3.1
Earnings Attributable to Common Shareholders		81.0		76.7		121.6		120.8
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)		(0.2)		(0.2)
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers		522.5		520.7		1,026.2		1,004.9
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers		0.8		0.4		1.3		1.0
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		189.9		180.0		399.2		378.2
Mineral Rights
Expenses
Gain on Sale of Mineral Rights						0.0		(116.3)
Reconciling Adjustments [Member]
Revenues
Revenue from Contracts with Customers		0.0		0.0		0.0		0.0
TOTAL REVENUES		(464.2)		(373.3)		(907.9)		(765.5)
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		(464.2)		(373.3)		(907.9)		(765.5)
Reconciling Adjustments [Member] | Other Revenues [Member]
Revenues
TOTAL REVENUES		(2.0)	[1]	(2.0)	[2],[3]	(2.9)	[4],[5]	(4.9)	[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

[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.