Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Revenues
Revenue from Contracts with Customers	$ 16,792.0		$ 14,918.5		$ 15,561.4
Sales to AEP Affiliates	0.0		0.0		0.0
TOTAL REVENUES	16,792.0		14,918.5		15,561.4
Expenses
Other Operation	2,547.7		2,572.4		2,743.7
Maintenance	1,121.8		1,010.4		1,213.9
Asset Impairments and Other Related Charges	11.6		0.0		156.4
Depreciation and Amortization	2,825.7		2,682.8		2,514.5
Taxes Other Than Income Taxes	1,407.6		1,295.5		1,234.5
TOTAL EXPENSES	13,380.7		11,930.8		12,969.1
OPERATING INCOME (LOSS)	3,411.3		2,987.7		2,592.3
Other Income (Expense):
Other Income	41.4		57.0		26.6
Allowance for Equity Funds Used During Construction	139.7		148.1		168.4
Non-Service Cost Components of Net Periodic Benefit Cost	118.6		119.0		120.0
Interest Expense	(1,199.1)		(1,165.7)		(1,072.5)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	2,511.9		2,146.1		1,834.8
Income Tax Expense (Benefit)	115.5		40.5		(12.9)
Equity Earnings (Loss) of Unconsolidated Subsidiaries	91.7		91.1		72.1
Net Income (Loss)	2,488.1		2,196.7		1,919.8
Net Income Attributable to Noncontrolling Interests	0.0		(3.4)		(1.3)
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 2,488.1		$ 2,200.1		$ 1,921.1
Earnings Per Share
WEIGHTED AVERAGE NUMBER OF BASIC AEP COMMON SHARES OUTSTANDING	500,522,177		495,718,223		493,694,345
Total Basic Earnings (Loss) per Share Attributable to AEP Common Shareholders	$ 4.97		$ 4.44		$ 3.89
WEIGHTED AVERAGE NUMBER OF DILUTED AEP COMMON SHARES OUTSTANDING	501,784,032		497,226,867		495,306,238
TOTAL DILUTED EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS	$ 4.96		$ 4.42		$ 3.88
Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	$ 9,852.2		$ 8,753.2		$ 9,245.7
Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	4,464.1		4,238.7		4,319.0
Generation and Marketing Revenues [Member]
Revenues
Revenue from Contracts with Customers	2,108.3		1,621.0		1,721.8
Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	367.4		305.6		274.9
TOTAL REVENUES	227.6	[1],[2]	61.5	[3],[4]	61.7	[5],[6]
Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	5,466.3		4,369.7		5,106.1
AEP Texas Inc. [Member]
Revenues
Revenue from Contracts with Customers	1,587.7		1,528.0		1,551.6
Sales to AEP Affiliates	3.9		90.8		160.5
TOTAL REVENUES	1,593.8		1,618.9		1,709.3
Expenses
Other Operation	489.5		488.9		492.0
Maintenance	86.2		80.5		158.8
Asset Impairments and Other Related Charges	0.0		0.0		32.5
Depreciation and Amortization	387.0		529.8		622.3
Taxes Other Than Income Taxes	155.1		136.4		140.6
TOTAL EXPENSES	1,117.8		1,249.3		1,477.3
OPERATING INCOME (LOSS)	476.0		369.6		232.0
Other Income (Expense):
Interest Income	0.8		1.4		3.4
Allowance for Equity Funds Used During Construction	21.5		19.4		15.2
Non-Service Cost Components of Net Periodic Benefit Cost	11.1		11.2		11.3
Interest Expense	(176.5)		(171.8)		(137.2)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	332.9		229.8		124.7
Income Tax Expense (Benefit)	43.1		(11.2)		(53.6)
Net Income (Loss)	289.8		241.0		178.3
AEP Texas Inc. [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	1,586.4		1,524.9		1,545.9
AEP Texas Inc. [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	3.5		3.2		2.9
TOTAL REVENUES	0.0	[7]	87.5	[8]	157.1	[9]
AEP Texas Inc. [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	0.0		13.7		31.1
AEP Transmission Co [Member]
Revenues
Revenue from Contracts with Customers	1,410.9		1,232.7		1,042.1
Sales to AEP Affiliates	1,153.9		896.3		806.7
TOTAL REVENUES	1,469.3		1,145.7		1,021.4
Expenses
Other Operation	105.5		99.8		93.9
Maintenance	18.4		10.2		15.4
Depreciation and Amortization	297.3		249.0		176.0
Taxes Other Than Income Taxes	238.8		205.2		168.9
TOTAL EXPENSES	660.0		564.2		454.2
OPERATING INCOME (LOSS)	809.3		581.5		567.2
Other Income (Expense):
Interest Income	0.5		2.4		3.0
Allowance for Equity Funds Used During Construction	67.2		74.0		84.3
Interest Expense	(141.2)		(127.8)		(97.4)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	735.8		530.1		557.1
Income Tax Expense (Benefit)	144.1		106.7		117.4
Net Income (Loss)	591.7		423.4		439.7
AEP Transmission Co [Member] | Transmission [Member]
Revenues
Revenue from Contracts with Customers	315.1		248.8		214.6
AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	0.3		0.6		0.1
TOTAL REVENUES	0.0	[7]	0.0	[8]	0.0	[9]
Appalachian Power Co [Member]
Revenues
Revenue from Contracts with Customers	3,092.9		2,809.2		2,911.1
Sales to AEP Affiliates	197.9		174.7		205.3
TOTAL REVENUES	3,105.2		2,796.2		2,924.7
Expenses
Other Operation	610.0		530.5		567.6
Maintenance	265.5		226.8		255.4
Asset Impairments and Other Related Charges	0.0		0.0		92.9
Re-Establishment of Regulatory Asset - Coal Fired Generation	0.0		(49.0)		0.0
Depreciation and Amortization	546.2		507.5		466.8
Taxes Other Than Income Taxes	154.2		150.2		146.2
TOTAL EXPENSES	2,555.8		2,239.6		2,527.4
OPERATING INCOME (LOSS)	549.4		556.6		397.3
Other Income (Expense):
Interest Income	1.0		1.6		2.4
Allowance for Equity Funds Used During Construction	15.6		14.6		16.6
Non-Service Cost Components of Net Periodic Benefit Cost	19.0		18.8		17.0
Interest Expense	(214.0)		(217.6)		(205.0)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	371.0		374.0		228.3
Income Tax Expense (Benefit)	22.1		4.3		(78.0)
Net Income (Loss)	348.9		369.7		306.3
Appalachian Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	2,895.5		2,610.9		2,708.2
Appalachian Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	11.8		10.6		11.2
TOTAL REVENUES	0.0	[7]	0.0	[8]	0.0	[9]
Appalachian Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	440.3		513.3		607.5
Appalachian Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	539.6		360.3		391.0
Indiana Michigan Power Co [Member]
Revenues
Revenue from Contracts with Customers	2,330.7		2,236.0		2,308.1
Sales to AEP Affiliates	3.8		10.5		10.5
Other Revenues - Affiliated	54.0		60.8		63.4
TOTAL REVENUES	2,326.7		2,241.8		2,306.7
Expenses
Purchased Electricity from AEP Affiliates	217.9		172.8		214.9
Other Operation	645.2		650.0		641.2
Maintenance	210.0		193.2		231.2
Depreciation and Amortization	446.0		411.6		350.6
Taxes Other Than Income Taxes	110.8		107.1		105.1
TOTAL EXPENSES	1,968.8		1,878.9		1,965.9
OPERATING INCOME (LOSS)	357.9		362.9		340.8
Other Income (Expense):
Other Income	11.7		10.0		18.2
Allowance for Equity Funds Used During Construction	12.8		11.5		19.4
Non-Service Cost Components of Net Periodic Benefit Cost	16.4		16.7		17.7
Interest Expense	(116.8)		(112.3)		(117.9)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	269.2		277.3		258.8
Income Tax Expense (Benefit)	(10.6)		(7.5)		(10.6)
Net Income (Loss)	279.8		284.8		269.4
Indiana Michigan Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	2,261.2		2,165.3		2,222.1
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	7.7		5.2		10.7
Sales to AEP Affiliates	60.0		69.0		73.0
TOTAL REVENUES	0.0	[7]	0.0	[8]	0.0	[9]
Indiana Michigan Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	162.1		162.0		190.6
Indiana Michigan Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	176.8		182.2		232.3
Ohio Power Co [Member]
Revenues
Revenue from Contracts with Customers	2,837.5		2,665.0		2,748.8
Sales to AEP Affiliates	24.8		41.5		27.3
TOTAL REVENUES	2,899.1		2,749.1		2,797.6
Expenses
Purchased Electricity from AEP Affiliates	51.9		119.7		156.0
Amortization of Generation Deferrals	0.0		0.0		65.3
Other Operation	836.8		822.6		742.6
Maintenance	158.2		127.1		150.1
Depreciation and Amortization	303.3		276.6		240.9
Taxes Other Than Income Taxes	485.7		450.2		434.2
TOTAL EXPENSES	2,513.9		2,345.4		2,396.4
OPERATING INCOME (LOSS)	385.2		403.7		401.2
Other Income (Expense):
Interest Income	0.6		1.0		3.2
Carrying Costs Income	1.2		1.6		1.0
Allowance for Equity Funds Used During Construction	10.8		12.5		18.2
Non-Service Cost Components of Net Periodic Benefit Cost	14.6		15.0		14.6
Interest Expense	(124.4)		(117.2)		(106.2)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	288.0		316.6		332.0
Income Tax Expense (Benefit)	34.4		45.2		34.9
Net Income (Loss)	253.6		271.4		297.1
Ohio Power Co [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	2,863.7		2,698.6		2,759.5
Ohio Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	10.6		9.0		10.8
TOTAL REVENUES	19.0	[7]	17.5	[8]	17.1	[9]
Ohio Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	678.0		549.2		607.3
Public Service Co Of Oklahoma [Member]
Revenues
Revenue from Contracts with Customers	1,474.3		1,263.9		1,512.8
Sales to AEP Affiliates	4.2		5.2		6.1
TOTAL REVENUES	1,474.4		1,266.1		1,481.8
Expenses
Other Operation	353.8		327.3		315.0
Maintenance	97.2		98.4		100.7
Depreciation and Amortization	196.6		173.5		169.5
Taxes Other Than Income Taxes	49.6		47.5		43.3
TOTAL EXPENSES	1,281.5		1,090.2		1,282.5
OPERATING INCOME (LOSS)	192.9		175.9		199.3
Other Income (Expense):
Interest Income	4.3		0.1		1.2
Allowance for Equity Funds Used During Construction	2.4		4.0		2.7
Non-Service Cost Components of Net Periodic Benefit Cost	8.5		8.5		8.4
Interest Expense	(62.9)		(60.3)		(66.5)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	145.2		128.2		145.1
Income Tax Expense (Benefit)	4.1		5.2		7.5
Net Income (Loss)	141.1		123.0		137.6
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	1,465.3		1,246.1		1,469.6
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	4.9		14.8		6.1
TOTAL REVENUES	0.0	[7]	0.0	[8]	0.0	[9]
Public Service Co Of Oklahoma [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	584.3		443.5		654.0
Southwestern Electric Power Co [Member]
Revenues
Revenue from Contracts with Customers	2,126.0		1,735.3		1,799.2
Sales to AEP Affiliates	41.4		41.0		36.9
Provision for Refund	(0.4)		(2.0)		(32.0)
TOTAL REVENUES	2,131.8		1,738.5		1,750.9
Expenses
Other Operation	360.3		338.3		348.0
Maintenance	136.7		129.7		145.6
Asset Impairments and Other Related Charges	11.6		0.0		0.0
Depreciation and Amortization	295.0		272.7		249.1
Taxes Other Than Income Taxes	117.7		102.8		100.2
TOTAL EXPENSES	1,792.3		1,448.0		1,495.2
OPERATING INCOME (LOSS)	339.5		290.5		255.7
Other Income (Expense):
Interest Income	9.2		2.1		2.6
Allowance for Equity Funds Used During Construction	7.0		7.7		6.8
Non-Service Cost Components of Net Periodic Benefit Cost	8.3		8.4		8.5
Interest Expense	(125.9)		(118.5)		(119.1)
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS)	238.1		190.2		154.5
Income Tax Expense (Benefit)	(0.6)		9.4		(4.7)
Equity Earnings (Loss) of Unconsolidated Subsidiaries	3.4		2.9		3.0
Net Income (Loss)	242.1		183.7		162.2
Net Income Attributable to Noncontrolling Interests	3.1		2.9		3.6
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS	239.0		180.8		158.6
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	2,088.9		1,696.6		1,744.6
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	1.9		2.9		1.4
TOTAL REVENUES	0.0	[7]	0.0	[8]	0.0	[9]
Southwestern Electric Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	$ 871.0		$ 604.5		$ 652.3

[1] Amounts include affiliated and nonaffiliated revenues.

[2] Generation & Marketing includes economic hedge activity.

[3] Amounts include affiliated and nonaffiliated revenues.

[4] Generation & Marketing includes economic hedge activity.

[5] Amounts include affiliated and nonaffiliated revenues.

[6] Generation & Marketing includes economic hedge activity.

[7] Amounts include affiliated and nonaffiliated revenues.

[8] Amounts include affiliated and nonaffiliated revenues.

[9] Amounts include affiliated and nonaffiliated revenues.