Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2022		Jun. 30, 2021
Revenues
Revenue from Contracts with Customers	$ 4,639.7		$ 3,826.5		$ 9,232.3		$ 8,107.6
Sales to AEP Affiliates	0.0		0.0		0.0		0.0
TOTAL REVENUES	4,639.7		3,826.5		9,232.3		8,107.6
Expenses
Other Operation	619.8		566.9		1,282.0		1,159.3
Maintenance	326.5		264.3		611.5		539.2
Loss on the Expected Sale of the Kentucky Operations	68.8		0.0		68.8		0.0
Gain on Sale of Mineral Rights	(116.3)		0.0		(116.3)		0.0
Depreciation and Amortization	802.6		707.3		1,595.0		1,403.6
Taxes Other Than Income Taxes	369.5		354.1		733.7		700.6
TOTAL EXPENSES	3,635.3		3,016.6		7,239.8		6,487.4
OPERATING INCOME (LOSS)	1,004.4		809.9		1,992.5		1,620.2
Other Income (Expense):
Other Income	(12.7)		33.1		(10.4)		54.8
Allowance for Equity Funds Used During Construction	28.6		33.5		59.6		66.9
Non-Service Cost Components of Net Periodic Benefit Cost	47.1		29.7		94.3		59.3
Interest Expense	(327.6)		(301.6)		(641.0)		(591.8)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	739.8		604.6		1,495.0		1,209.4
Income Tax Expense (Benefit)	54.0		61.2		106.8		115.7
Equity Earnings (Loss) of Unconsolidated Subsidiaries	(165.0)		30.4		(149.3)		58.9
Net Income (Loss)	520.8		573.8		1,238.9		1,152.6
Net Income (Loss) Attributable to Noncontrolling Interests	(3.7)		(4.4)		(0.3)		(0.6)
Earnings Attributable to Common Shareholders	$ 524.5		$ 578.2		$ 1,239.2		$ 1,153.2
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding	513,623,431		499,916,640		509,857,710		498,495,532
Total Basic Earnings Per Share Attributable to AEP Common Shareholders	$ 1.02		$ 1.16		$ 2.43		$ 2.31
Weighted Average Number of Diluted AEP Common Shares Outstanding	515,162,210		500,983,778		511,391,735		499,581,893
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders	$ 1.02		$ 1.15		$ 2.42		$ 2.31
Common Stock, Dividends Per Share, Declared	$ 0.78		$ 0.74
Cash Flow Hedges, Tax	$ 35.2		$ 34.5		$ 101.1		$ 49.5
Amortization of Pension and OPEB Deferred Costs, Tax	(3.1)		(0.6)		(3.7)		(1.1)
Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	2,595.0		2,224.6		5,241.8		4,729.1
Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	1,296.8		1,089.6		2,539.0		2,171.9
Generation and Marketing [Member]
Revenues
Revenue from Contracts with Customers	654.4		422.5		1,263.9		1,024.2
Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	93.5		89.8		187.6		182.4
TOTAL REVENUES	135.7	[1]	29.1	[2],[3]	301.1	[4],[5]	33.9	[6],[7]
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	1,564.4		1,124.0		3,065.1		2,684.7
AEP Texas Inc. [Member]
Revenues
Sales to AEP Affiliates	0.8		1.0		1.7		2.0
TOTAL REVENUES	478.8		398.5		895.5		762.7
Expenses
Other Operation	142.0		109.6		267.8		231.8
Maintenance	24.8		18.7		47.4		37.8
Depreciation and Amortization	116.2		102.0		225.0		199.5
Taxes Other Than Income Taxes	43.0		39.5		80.3		75.8
TOTAL EXPENSES	326.0		269.8		620.5		544.9
OPERATING INCOME (LOSS)	152.8		128.7		275.0		217.8
Other Income (Expense):
Interest Income	1.3		0.2		1.4		0.4
Allowance for Equity Funds Used During Construction	3.7		3.4		8.0		7.5
Non-Service Cost Components of Net Periodic Benefit Cost	4.1		2.7		8.3		5.5
Interest Expense	(52.3)		(45.3)		(97.8)		(88.3)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	109.6		89.7		194.9		142.9
Income Tax Expense (Benefit)	19.6		9.9		35.3		17.0
Net Income (Loss)	90.0		79.8		159.6		125.9
Earnings Per Share
Cash Flow Hedges, Tax	0.0		0.0		0.1		0.1
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	476.9		396.6		891.6		758.3
AEP Texas Inc. [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	1.1		0.9		2.2		2.4
TOTAL REVENUES	0.0	[8]	0.0	[9]	0.0	[10]	0.0	[11]
AEP Transmission Co [Member]
Revenues
Revenue from Contracts with Customers							0.1
Sales to AEP Affiliates	333.9		299.0		658.9		584.6
Provision for Refund Affiliated	(46.8)		(17.6)		(56.4)		(17.6)
Provision for Refund-Nonaffiliated	(8.3)		(2.0)		(10.3)		(2.3)
TOTAL REVENUES	364.4		365.5		764.8		727.2
Expenses
Other Operation	29.6		24.4		55.1		45.5
Maintenance	3.8		3.3		7.1		6.9
Depreciation and Amortization	85.7		72.4		168.8		143.0
Taxes Other Than Income Taxes	68.7		60.1		134.3		117.9
TOTAL EXPENSES	187.8		160.2		365.3		313.3
OPERATING INCOME (LOSS)	176.6		205.3		399.5		413.9
Other Income (Expense):
Interest Income	0.2		0.1		0.3		0.2
Allowance for Equity Funds Used During Construction	15.3		16.6		30.9		33.3
Interest Expense	(39.3)		(34.3)		(77.0)		(68.4)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	152.8		187.7		353.7		379.0
Income Tax Expense (Benefit)	34.3		39.1		79.8		78.7
Net Income (Loss)	118.5		148.6		273.9		300.3
Earnings Per Share
Revenues from Related Parties, Net of Provisions for Refund	287.1		281.4		602.5		567.0
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)	0.1	[12]	0.1		0.1	[12]	0.1
AEP Transmission Co [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers							0.1
Sales to AEP Affiliates	287.1		281.4		602.5		567.0
TOTAL REVENUES	364.4		365.5		764.8		727.2
Other Income (Expense):
Net Income (Loss)	118.4		148.5		273.8		300.2
AEP Transmission Co [Member] | Transmission [Member]
Revenues
Revenue from Contracts with Customers	85.6		86.1		172.6		162.4
Earnings Per Share
Revenue from Contract with Customers, Net of Provisions for Refund, Including Assessed Tax	77.3		84.1		162.3		160.1
AEP Transmission Co [Member] | Transmission [Member] | State Transcos [Member]
Revenues
Revenue from Contracts with Customers	77.3		84.1		162.3		160.1
AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	0.0		0.0		0.0		0.1
TOTAL REVENUES	0.0	[8]	0.0	[9]	0.0	[10]	0.0	[11]
Appalachian Power Co [Member]
Revenues
Sales to AEP Affiliates	63.1		38.1		120.0		88.2
TOTAL REVENUES	773.6		677.0		1,680.9		1,494.0
Expenses
Other Operation	147.1		118.7		332.0		269.1
Maintenance	71.2		50.1		145.3		115.3
Depreciation and Amortization	142.9		135.4		288.1		271.2
Taxes Other Than Income Taxes	39.3		39.2		79.5		76.9
TOTAL EXPENSES	646.2		556.5		1,361.1		1,199.6
OPERATING INCOME (LOSS)	127.4		120.5		319.8		294.4
Other Income (Expense):
Interest Income	0.3		0.3		0.4		0.6
Allowance for Equity Funds Used During Construction	2.6		4.3		4.6		7.8
Non-Service Cost Components of Net Periodic Benefit Cost	7.2		4.8		14.5		9.5
Interest Expense	(55.1)		(52.9)		(109.4)		(107.8)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	82.4		77.0		229.9		204.5
Income Tax Expense (Benefit)	(7.8)		10.7		19.5		15.7
Net Income (Loss)	90.2		66.3		210.4		188.8
Earnings Per Share
Cash Flow Hedges, Tax	0.0		(0.1)		(0.1)		2.3
Amortization of Pension and OPEB Deferred Costs, Tax	(0.3)		(0.3)		(0.6)		(0.6)
Appalachian Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	704.9		636.5		1,552.0		1,400.7
Appalachian Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	5.6		2.4		8.9		5.1
TOTAL REVENUES	0.0	[8]	(0.2)	[9]	0.1	[10]	0.0	[11]
Appalachian Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	245.7		213.1		516.2		467.1
Indiana Michigan Power Co [Member]
Revenues
Sales to AEP Affiliates	7.1		0.7		9.1		1.5
Other Revenues - Affiliated	16.7		12.2		25.1		26.5
TOTAL REVENUES	631.0		583.8		1,256.2		1,148.3
Expenses
Purchased Electricity from AEP Affiliates	59.6		57.8		116.7		109.4
Other Operation	149.2		160.3		288.5		314.9
Maintenance	60.8		64.4		111.8		113.4
Depreciation and Amortization	133.7		108.9		268.6		218.1
Taxes Other Than Income Taxes	28.6		29.8		53.8		56.0
TOTAL EXPENSES	542.8		510.8		1,056.0		985.0
OPERATING INCOME (LOSS)	88.2		73.0		200.2		163.3
Other Income (Expense):
Other Income	2.4		3.4		5.0		6.4
Allowance for Equity Funds Used During Construction					5.4		7.0
Non-Service Cost Components of Net Periodic Benefit Cost	6.2		4.1		12.5		8.2
Interest Expense	(31.0)		(29.1)		(61.3)		(56.4)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	65.8		51.4		156.4		121.5
Income Tax Expense (Benefit)	(1.4)		(5.8)		(0.3)		(6.5)
Net Income (Loss)	67.2		57.2		156.7		128.0
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
Indiana Michigan Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	604.4		569.2		1,216.4		1,116.9
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	2.8		1.7		5.6		3.4
Sales to AEP Affiliates	19.0		13.0		29.0		29.0
TOTAL REVENUES	0.0	[8]	0.0	[9]	(0.1)	[10]	0.0	[11]
Indiana Michigan Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	110.9		89.6		216.6		173.2
Ohio Power Co [Member]
Revenues
Sales to AEP Affiliates	3.9		12.8		7.6		17.6
TOTAL REVENUES	822.9		704.9		1,652.9		1,428.8
Expenses
Purchased Electricity from AEP Affiliates	3.5		14.4		9.8		44.5
Other Operation	223.3		193.2		460.9		377.8
Maintenance	48.5		38.4		88.9		77.1
Depreciation and Amortization	71.3		76.6		146.2		151.7
Taxes Other Than Income Taxes	121.0		118.9		248.0		240.2
TOTAL EXPENSES	716.8		595.1		1,429.3		1,220.2
OPERATING INCOME (LOSS)	106.1		109.8		223.6		208.6
Other Income (Expense):
Interest Income	0.5		0.1		0.6		0.3
Carrying Costs Income	0.1		0.5		0.2		1.0
Allowance for Equity Funds Used During Construction	3.4		2.9		6.4		5.6
Non-Service Cost Components of Net Periodic Benefit Cost	5.5		3.6		11.0		7.3
Interest Expense	(29.8)		(31.7)		(59.0)		(63.3)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	85.8		85.2		182.8		159.5
Income Tax Expense (Benefit)	11.8		11.2		25.6		17.3
Equity Earnings (Loss) of Unconsolidated Subsidiaries	0.8		0.0		0.8		0.0
Net Income (Loss)	74.8		74.0		158.0		142.2
Ohio Power Co [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	817.2		690.1		1,641.4		1,406.8
Ohio Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	1.8		2.0		3.9		4.4
TOTAL REVENUES	6.8	[8]	4.0	[9]	13.1	[10]	9.3	[11]
Ohio Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	249.2		153.6		475.5		328.9
Public Service Co Of Oklahoma [Member]
Revenues
Sales to AEP Affiliates	0.8		1.1		1.4		2.1
TOTAL REVENUES	442.9		344.5		830.5		640.6
Expenses
Other Operation	95.9		81.3		184.7		160.4
Maintenance	31.3		22.5		56.7		46.9
Depreciation and Amortization	60.5		50.2		113.2		100.1
Taxes Other Than Income Taxes	13.8		12.5		28.0		25.0
TOTAL EXPENSES	393.4		290.5		763.2		577.3
OPERATING INCOME (LOSS)	49.5		54.0		67.3		63.3
Other Income (Expense):
Interest Income	2.5		1.6		4.2		1.7
Allowance for Equity Funds Used During Construction	0.2		0.6		1.3		1.0
Non-Service Cost Components of Net Periodic Benefit Cost	3.2		2.2		6.3		4.3
Interest Expense	(21.3)		(14.1)		(40.2)		(28.5)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	34.1		44.3		38.9		41.8
Income Tax Expense (Benefit)	(8.9)		(1.8)		(9.9)		(1.6)
Net Income (Loss)	43.0		46.1		48.8		43.4
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	440.0		342.5		826.4		636.1
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	2.1		0.9		2.7		2.4
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	191.9		124.0		380.6		244.9
Southwestern Electric Power Co [Member]
Revenues
Sales to AEP Affiliates	15.5		10.9		25.5		18.7
TOTAL REVENUES	536.6		430.1		1,031.4		1,046.2
Expenses
Other Operation	103.1		88.6		194.6		178.9
Maintenance	44.8		31.8		74.9		65.8
Depreciation and Amortization	78.2		73.0		156.0		142.6
Taxes Other Than Income Taxes	30.9		30.1		60.7		60.1
TOTAL EXPENSES	437.0		362.0		864.4		885.7
OPERATING INCOME (LOSS)	99.6		68.1		167.0		160.5
Other Income (Expense):
Interest Income	7.6		3.1		11.2		4.1
Allowance for Equity Funds Used During Construction	0.8		1.9		2.4		4.0
Non-Service Cost Components of Net Periodic Benefit Cost	3.1		2.0		6.2		4.1
Interest Expense	(33.7)		(31.4)		(66.8)		(60.7)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	77.4		43.7		120.0		112.0
Income Tax Expense (Benefit)	(1.0)		7.1		(3.2)		12.7
Equity Earnings (Loss) of Unconsolidated Subsidiaries	0.4		0.8		0.7		1.5
Net Income (Loss)	78.8		37.4		123.9		100.8
Net Income (Loss) Attributable to Noncontrolling Interests	2.1		0.6		3.1		1.6
Earnings Attributable to Common Shareholders	76.7		36.8		120.8		99.2
Earnings Per Share
Cash Flow Hedges, Tax	0.0		0.1		0.0		0.2
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	520.7		418.8		1,004.9		1,026.5
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	0.4		0.4		1.0		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	180.0		138.5		378.2		438.3
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	(373.3)		(367.8)		(765.5)		(736.2)
TOTAL REVENUES	(373.3)		(367.8)		(765.5)		(736.2)
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]	(2.0)	[2],[3]	(4.9)	[4],[5]	(5.6)	[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.