Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022		Mar. 31, 2021
Revenues
Revenue from Contracts with Customers	$ 4,592.6		$ 4,281.1
Sales to AEP Affiliates	0.0		0.0
TOTAL REVENUES	4,592.6		4,281.1
Expenses
Other Operation	662.2		592.4
Maintenance	285.0		274.9
Depreciation and Amortization	792.4		696.3
Taxes Other Than Income Taxes	364.2		346.5
TOTAL EXPENSES	3,604.5		3,470.8
OPERATING INCOME (LOSS)	988.1		810.3
Other Income (Expense):
Other Income	2.3		21.7
Allowance for Equity Funds Used During Construction	31.0		33.4
Non-Service Cost Components of Net Periodic Benefit Cost	47.2		29.6
Interest Expense	(313.4)		(290.2)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	755.2		604.8
Income Tax Expense (Benefit)	52.8		54.5
Equity Earnings (Loss) of Unconsolidated Subsidiaries	15.7		28.5
Net Income (Loss)	718.1		578.8
Net Income (Loss) Attributable to Noncontrolling Interests	3.4		3.8
Earnings Attributable to Common Shareholders	$ 714.7		$ 575.0
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding	506,050,147		497,058,635
Total Basic Earnings Per Share Attributable to AEP Common Shareholders	$ 1.41		$ 1.16
Weighted Average Number of Diluted AEP Common Shares Outstanding	507,658,522		498,164,219
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders	$ 1.41		$ 1.15
Common Stock, Dividends Per Share, Declared	$ 0.78		$ 0.74
Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	$ 2,646.8		$ 2,504.5
Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	1,242.2		1,082.3
Generation and Marketing [Member]
Revenues
Revenue from Contracts with Customers	609.5		601.7
Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	94.1		92.6
TOTAL REVENUES	165.4	[1]	4.8	[2]
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	1,500.7		1,560.7
AEP Texas Inc. [Member]
Revenues
Sales to AEP Affiliates	0.9		1.0
TOTAL REVENUES	416.7		364.2
Expenses
Other Operation	125.8		122.2
Maintenance	22.6		19.1
Depreciation and Amortization	108.8		97.5
Taxes Other Than Income Taxes	37.3		36.3
TOTAL EXPENSES	294.5		275.1
OPERATING INCOME (LOSS)	122.2		89.1
Other Income (Expense):
Interest Income	0.1		0.2
Allowance for Equity Funds Used During Construction	4.3		4.1
Non-Service Cost Components of Net Periodic Benefit Cost	4.2		2.8
Interest Expense	(45.5)		(43.0)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	85.3		53.2
Income Tax Expense (Benefit)	15.7		7.1
Net Income (Loss)	69.6		46.1
AEP Texas Inc. [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	414.7		361.7
AEP Texas Inc. [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	1.1		1.5
TOTAL REVENUES	0.0	[3]	0.0	[4]
AEP Transmission Co [Member]
Revenues
Sales to AEP Affiliates	324.7		285.6
TOTAL REVENUES	400.4		361.7
Expenses
Other Operation	25.5		21.1
Maintenance	3.3		3.6
Depreciation and Amortization	83.1		70.6
Taxes Other Than Income Taxes	65.6		57.8
TOTAL EXPENSES	177.5		153.1
OPERATING INCOME (LOSS)	222.9		208.6
Other Income (Expense):
Interest Income	0.1		0.1
Allowance for Equity Funds Used During Construction	15.6		16.7
Interest Expense	(37.7)		(34.1)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	200.9		191.3
Income Tax Expense (Benefit)	45.5		39.6
Net Income (Loss)	155.4		151.7
AEP Transmission Co [Member] | Transmission [Member]
Revenues
Revenue from Contracts with Customers	75.7		76.0
AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	0.0		0.1
TOTAL REVENUES	0.0	[3]	0.0	[4]
Appalachian Power Co [Member]
Revenues
Sales to AEP Affiliates	56.9		50.1
TOTAL REVENUES	907.3		817.0
Expenses
Other Operation	184.9		150.4
Maintenance	74.1		65.2
Depreciation and Amortization	145.2		135.8
Taxes Other Than Income Taxes	40.2		37.7
TOTAL EXPENSES	714.9		643.1
OPERATING INCOME (LOSS)	192.4		173.9
Other Income (Expense):
Interest Income	0.1		0.3
Allowance for Equity Funds Used During Construction	2.0		3.5
Non-Service Cost Components of Net Periodic Benefit Cost	7.3		4.7
Interest Expense	(54.3)		(54.9)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	147.5		127.5
Income Tax Expense (Benefit)	27.3		5.0
Net Income (Loss)	120.2		122.5
Appalachian Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	847.1		764.2
Appalachian Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	3.3		2.7
TOTAL REVENUES	0.1	[3]	0.2	[4]
Appalachian Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	60.7		163.9
Appalachian Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	209.8		90.1
Indiana Michigan Power Co [Member]
Revenues
Sales to AEP Affiliates	2.0		0.8
Other Revenues - Affiliated	8.4		14.3
TOTAL REVENUES	625.2		564.5
Expenses
Purchased Electricity from AEP Affiliates	57.1		51.6
Other Operation	139.3		154.6
Maintenance	51.0		49.0
Depreciation and Amortization	134.9		109.2
Taxes Other Than Income Taxes	25.2		26.2
TOTAL EXPENSES	513.2		474.2
OPERATING INCOME (LOSS)	112.0		90.3
Other Income (Expense):
Other Income	2.6		3.0
Allowance for Equity Funds Used During Construction	2.9		3.5
Non-Service Cost Components of Net Periodic Benefit Cost	6.3		4.1
Interest Expense	(30.3)		(27.3)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	90.6		70.1
Income Tax Expense (Benefit)	1.1		(0.7)
Net Income (Loss)	89.5		70.8
Indiana Michigan Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	612.0		547.7
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	2.8		1.7
Sales to AEP Affiliates	10.0		16.0
TOTAL REVENUES	(0.1)	[3]	0.0	[4]
Indiana Michigan Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	50.0		36.3
Indiana Michigan Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	55.7		47.3
Ohio Power Co [Member]
Revenues
Sales to AEP Affiliates	3.7		4.8
TOTAL REVENUES	830.0		723.9
Expenses
Purchased Electricity from AEP Affiliates	6.3		30.1
Other Operation	237.6		184.6
Maintenance	40.4		38.7
Depreciation and Amortization	74.9		75.1
Taxes Other Than Income Taxes	127.0		121.3
TOTAL EXPENSES	712.5		625.1
OPERATING INCOME (LOSS)	117.5		98.8
Other Income (Expense):
Interest Income	0.1		0.2
Carrying Costs Income	0.1		0.5
Allowance for Equity Funds Used During Construction	3.0		2.7
Non-Service Cost Components of Net Periodic Benefit Cost	5.5		3.7
Interest Expense	(29.2)		(31.6)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	97.0		74.3
Income Tax Expense (Benefit)	13.8		6.1
Net Income (Loss)	83.2		68.2
Ohio Power Co [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	824.2		716.7
Ohio Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	2.1		2.4
TOTAL REVENUES	6.3	[3]	5.3	[4]
Ohio Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	226.3		175.3
Public Service Co Of Oklahoma [Member]
Revenues
Sales to AEP Affiliates	0.6		1.0
TOTAL REVENUES	387.6		296.1
Expenses
Other Operation	88.8		79.1
Maintenance	25.4		24.4
Depreciation and Amortization	52.7		49.9
Taxes Other Than Income Taxes	14.2		12.5
TOTAL EXPENSES	369.8		286.8
OPERATING INCOME (LOSS)	17.8		9.3
Other Income (Expense):
Interest Income	1.7		0.1
Allowance for Equity Funds Used During Construction	1.1		0.4
Non-Service Cost Components of Net Periodic Benefit Cost	3.1		2.1
Interest Expense	(18.9)		(14.4)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	4.8		(2.5)
Income Tax Expense (Benefit)	(1.0)		0.2
Net Income (Loss)	5.8		(2.7)
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	386.4		293.6
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	0.6		1.5
TOTAL REVENUES	0.0	[3]	0.0	[4]
Public Service Co Of Oklahoma [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	188.7		120.9
Southwestern Electric Power Co [Member]
Revenues
Sales to AEP Affiliates	10.0		7.8
TOTAL REVENUES	494.8		616.1
Expenses
Other Operation	91.5		90.3
Maintenance	30.1		34.0
Depreciation and Amortization	77.8		69.6
Taxes Other Than Income Taxes	29.8		30.0
TOTAL EXPENSES	427.4		523.7
OPERATING INCOME (LOSS)	67.4		92.4
Other Income (Expense):
Interest Income	3.6		1.0
Allowance for Equity Funds Used During Construction	1.6		2.1
Non-Service Cost Components of Net Periodic Benefit Cost	3.1		2.1
Interest Expense	(33.1)		(29.3)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	42.6		68.3
Income Tax Expense (Benefit)	(2.2)		5.6
Equity Earnings (Loss) of Unconsolidated Subsidiaries	0.3		0.7
Net Income (Loss)	45.1		63.4
Net Income (Loss) Attributable to Noncontrolling Interests	1.0		1.0
Earnings Attributable to Common Shareholders	44.1		62.4
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	484.2		607.7
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	0.6		0.6
TOTAL REVENUES	0.0	[3]	0.0	[4]
Southwestern Electric Power Co [Member] | Purchased Electricity, Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	$ 198.2		$ 299.8

[1] Amounts include affiliated and nonaffiliated revenues.

[2] Amounts include affiliated and nonaffiliated revenues

[3] Amounts include affiliated and nonaffiliated revenues.

[4] Amounts include affiliated and nonaffiliated revenues.