Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019
Revenues
Revenue from Contracts with Customers	$ 3,494.0		$ 3,573.6		$ 7,241.5		$ 7,630.4
Sales to AEP Affiliates	0.0		0.0		0.0		0.0
TOTAL REVENUES	3,494.0		3,573.6		7,241.5		7,630.4
Expenses
Other Operation	566.0		607.4		1,168.1		1,273.4
Maintenance	243.4		348.7		492.9		623.2
Depreciation and Amortization	679.5		622.6		1,351.7		1,228.4
Taxes Other Than Income Taxes	317.5		302.3		638.6		612.2
TOTAL EXPENSES	2,771.3		3,022.6		5,767.2		6,291.0
OPERATING INCOME (LOSS)	722.7		551.0		1,474.3		1,339.4
Other Income (Expense):
Other Income	14.3		6.6		9.9		15.2
Allowance for Equity Funds Used During Construction	35.1		50.4		66.5		79.3
Non-Service Cost Components of Net Periodic Benefit Cost	29.8		30.0		59.5		60.0
Interest Expense	(294.0)		(250.7)		(586.1)		(506.5)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	507.9		387.3		1,024.1		987.4
Income Tax Expense (Benefit)	12.6		(54.4)		59.1		(9.9)
Equity Earnings (Loss) of Unconsolidated Subsidiaries	19.2		17.4		48.8		35.9
Net Income (Loss)	514.5		459.1		1,013.8		1,033.2
Net Income (Loss) Attributable to Noncontrolling Interests	(6.3)		(2.2)		(2.2)		(0.9)
Earnings Attributable to Common Shareholders	$ 520.8		$ 461.3		$ 1,016.0		$ 1,034.1
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding	495,655,053		493,584,347		495,125,961		493,447,477
Total Basic Earnings Per Share Attributable to AEP Common Shareholders	$ 1.05		$ 0.93		$ 2.05		$ 2.10
Weighted Average Number of Diluted AEP Common Shares Outstanding	497,337,980		495,382,966		496,973,449		494,934,320
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders	$ 1.05		$ 0.93		$ 2.04		$ 2.09
Common Stock, Dividends Per Share, Declared	$ 0.70		$ 0.67
Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	$ 2,062.3		$ 2,116.4		$ 4,255.3		$ 4,488.7
Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	1,009.4		1,001.6		2,084.6		2,181.4
Generation and Marketing [Member]
Revenues
Revenue from Contracts with Customers	350.2		382.9		758.6		822.6
Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	72.1		72.7		143.0		137.7
TOTAL REVENUES	(1.1)	[1]	(9.4)	[2]	18.8	[3]	40.3	[4]
Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	360.3		480.9		715.6		1,031.3
Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	604.6		660.7		1,400.3		1,522.5
AEP Texas Inc. [Member]
Revenues
Sales to AEP Affiliates	16.9		42.2		48.0		82.4
TOTAL REVENUES	401.5		438.0		825.1		828.7
Expenses
Other Operation	92.9		111.2		210.4		221.0
Maintenance	23.1		89.9		43.7		115.2
Depreciation and Amortization	165.6		155.7		328.1		294.6
Taxes Other Than Income Taxes	34.0		34.0		68.0		70.5
TOTAL EXPENSES	318.8		399.3		653.4		719.2
OPERATING INCOME (LOSS)	82.7		38.7		171.7		109.5
Other Income (Expense):
Interest Income	0.1		0.7		0.7		1.1
Allowance for Equity Funds Used During Construction	4.9		1.4		10.0		3.2
Non-Service Cost Components of Net Periodic Benefit Cost	2.8		2.8		5.6		5.6
Interest Expense	(42.2)		(19.5)		(84.7)		(56.9)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	48.3		24.1		103.3		62.5
Income Tax Expense (Benefit)	(18.6)		(56.5)		(11.2)		(52.5)
Net Income (Loss)	66.9		80.6		114.5		115.0
AEP Texas Inc. [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	383.5		395.1		775.1		744.9
AEP Texas Inc. [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	1.1		0.7		2.0		1.4
TOTAL REVENUES	16.1	[5]	41.0	[6]	46.3	[7]	80.8	[8]
AEP Texas Inc. [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	3.2		8.5		3.2		17.9
AEP Transmission Co [Member]
Revenues
Sales to AEP Affiliates	177.7		209.1		411.4		402.3
TOTAL REVENUES	238.1		266.9		533.7		510.4
Expenses
Other Operation	22.9		18.7		46.7		35.7
Maintenance	0.1		2.5		3.3		5.7
Depreciation and Amortization	58.9		42.8		114.9		83.1
Taxes Other Than Income Taxes	50.2		41.9		100.6		83.3
TOTAL EXPENSES	132.1		105.9		265.5		207.8
OPERATING INCOME (LOSS)	106.0		161.0		268.2		302.6
Other Income (Expense):
Interest Income	1.3		0.6		2.1		1.3
Allowance for Equity Funds Used During Construction	18.5		28.8		34.7		40.1
Interest Expense	(32.8)		(21.4)		(62.4)		(43.1)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	93.0		169.0		242.6		300.9
Income Tax Expense (Benefit)	19.3		33.0		51.1		60.6
Net Income (Loss)	73.7		136.0		191.5		240.3
AEP Transmission Co [Member] | Transmission [Member]
Revenues
Revenue from Contracts with Customers	60.4		57.8		121.7		108.1
AEP Transmission Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	0.0		0.0		0.6		0.0
TOTAL REVENUES	0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Appalachian Power Co [Member]
Revenues
Sales to AEP Affiliates	30.8		46.3		80.5		98.0
TOTAL REVENUES	637.5		655.8		1,386.9		1,448.6
Expenses
Other Operation	108.8		138.9		242.8		275.8
Maintenance	46.4		61.3		96.7		122.8
Depreciation and Amortization	120.6		117.1		242.8		229.6
Taxes Other Than Income Taxes	37.5		35.9		75.4		71.8
TOTAL EXPENSES	517.6		578.9		1,095.6		1,219.6
OPERATING INCOME (LOSS)	119.9		76.9		291.3		229.0
Other Income (Expense):
Interest Income	0.5		1.0		0.8		1.8
Allowance for Equity Funds Used During Construction	2.4		6.0		4.8		7.7
Non-Service Cost Components of Net Periodic Benefit Cost	4.7		4.2		9.4		8.5
Interest Expense	(54.1)		(51.6)		(107.2)		(100.9)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	73.4		36.5		199.1		146.1
Income Tax Expense (Benefit)	(7.9)		(19.0)		2.5		(43.1)
Net Income (Loss)	81.3		55.5		196.6		189.2
Appalachian Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	604.0		605.9		1,301.0		1,344.6
Appalachian Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	2.7		3.6		5.4		6.0
TOTAL REVENUES	0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Appalachian Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Revenues
Sales to AEP Affiliates	24.0		30.0		57.0		64.0
Expenses
Cost of Goods and Services Sold	153.9		161.2		264.9		344.5
Appalachian Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	50.4		64.5		173.0		175.1
Indiana Michigan Power Co [Member]
Revenues
Sales to AEP Affiliates	4.9		2.3		7.8		4.6
Other Revenues - Affiliated	15.8		20.9		28.3		34.2
TOTAL REVENUES	546.6		543.1		1,116.9		1,157.4
Expenses
Purchased Electricity from AEP Affiliates	43.7		51.3		79.9		111.1
Other Operation	149.5		154.5		294.2		295.0
Maintenance	44.3		54.6		93.4		112.9
Depreciation and Amortization	105.2		87.3		199.1		173.5
Taxes Other Than Income Taxes	25.7		26.2		52.1		53.5
TOTAL EXPENSES	457.3		465.2		910.9		964.5
OPERATING INCOME (LOSS)	89.3		77.9		206.0		192.9
Other Income (Expense):
Other Income	3.1		6.1		5.6		11.8
Allowance for Equity Funds Used During Construction					4.8		12.5
Non-Service Cost Components of Net Periodic Benefit Cost	4.2		4.4		8.4		8.8
Interest Expense	(28.1)		(28.2)		(58.8)		(57.1)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	68.5		60.2		161.2		156.4
Income Tax Expense (Benefit)	4.7		(0.1)		5.1		(2.8)
Net Income (Loss)	63.8		60.3		156.1		159.2
Indiana Michigan Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	524.9		517.4		1,078.3		1,114.1
Indiana Michigan Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	1.0		2.5		2.5		4.5
Sales to AEP Affiliates	18.0		23.0		34.0		38.0
TOTAL REVENUES	0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Indiana Michigan Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	48.4		42.4		101.6		100.0
Indiana Michigan Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	40.5		48.9		90.6		118.5
Ohio Power Co [Member]
Revenues
Sales to AEP Affiliates	16.3		1.7		24.7		9.2
TOTAL REVENUES	640.4		606.6		1,330.7		1,443.4
Expenses
Purchased Electricity from AEP Affiliates	30.3		33.7		72.7		79.8
Amortization of Generation Deferrals	0.0		24.1		0.0		56.5
Other Operation	186.6		153.9		363.9		370.8
Maintenance	26.9		34.2		58.5		66.7
Depreciation and Amortization	59.8		56.1		130.3		119.4
Taxes Other Than Income Taxes	108.0		106.0		220.0		214.9
TOTAL EXPENSES	525.5		529.5		1,108.4		1,203.8
OPERATING INCOME (LOSS)	114.9		77.1		222.3		239.6
Other Income (Expense):
Interest Income	0.2		1.1		0.4		1.9
Carrying Costs Income	0.6		0.2		1.0		0.4
Allowance for Equity Funds Used During Construction	2.8		4.1		4.7		9.3
Non-Service Cost Components of Net Periodic Benefit Cost	3.7		3.6		7.5		7.3
Interest Expense	(30.1)		(25.6)		(59.0)		(50.2)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	92.1		60.5		176.9		208.3
Income Tax Expense (Benefit)	11.2		9.9		20.9		29.7
Net Income (Loss)	80.9		50.6		156.0		178.6
Ohio Power Co [Member] | Transmission and Distribution Utilities [Member]
Revenues
Revenue from Contracts with Customers	621.8		602.3		1,301.0		1,428.8
Ohio Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	2.3		2.6		5.0		5.4
TOTAL REVENUES	3.8	[5]	1.5	[6]	9.9	[7]	6.6	[8]
Ohio Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	113.9		121.5		263.0		295.7
Public Service Co Of Oklahoma [Member]
Revenues
Sales to AEP Affiliates	1.3		2.1		2.4		3.7
TOTAL REVENUES	308.6		348.1		605.9		680.9
Expenses
Other Operation	69.6		64.8		156.8		138.4
Maintenance	24.6		26.1		49.0		48.6
Depreciation and Amortization	45.0		42.8		89.7		86.3
Taxes Other Than Income Taxes	12.4		10.5		23.7		21.9
TOTAL EXPENSES	249.0		291.5		543.9		603.4
OPERATING INCOME (LOSS)	59.6		56.6		62.0		77.5
Other Income (Expense):
Interest Income	0.0		0.2		0.1		0.2
Allowance for Equity Funds Used During Construction	0.9		0.6		1.9		0.7
Non-Service Cost Components of Net Periodic Benefit Cost	2.1		2.1		4.2		4.2
Interest Expense	(15.5)		(17.3)		(31.3)		(34.2)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	47.1		42.2		36.9		48.4
Income Tax Expense (Benefit)	0.7		0.3		0.8		0.3
Net Income (Loss)	46.4		41.9		36.1		48.1
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	301.1		344.6		596.5		673.8
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	6.2		1.4		7.0		3.4
TOTAL REVENUES	0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Public Service Co Of Oklahoma [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	(1.6)		44.8		15.3		82.8
Public Service Co Of Oklahoma [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	99.0		102.5		209.4		225.4
Southwestern Electric Power Co [Member]
Revenues
Sales to AEP Affiliates	17.5		6.4		25.0		12.8
TOTAL REVENUES	415.0		375.5		800.9		796.6
Expenses
Other Operation	70.0		65.9		162.2		150.5
Maintenance	32.7		39.3		66.5		68.2
Depreciation and Amortization	68.1		61.8		135.4		123.9
Taxes Other Than Income Taxes	25.0		24.5		50.3		49.8
TOTAL EXPENSES	322.4		342.5		673.2		709.5
OPERATING INCOME (LOSS)	92.6		33.0		127.7		87.1
Other Income (Expense):
Interest Income	0.5		0.7		1.1		1.4
Allowance for Equity Funds Used During Construction	0.9		1.1		2.3		2.9
Non-Service Cost Components of Net Periodic Benefit Cost	2.1		2.2		4.2		4.3
Interest Expense	(29.7)		(30.5)		(59.8)		(60.2)
INCOME BEFORE INCOME TAX EXPENSE AND EQUITY EARNINGS	66.4		6.5		75.5		35.5
Income Tax Expense (Benefit)	7.9		0.0		1.7		0.7
Equity Earnings (Loss) of Unconsolidated Subsidiaries	0.7		0.8		1.5		1.5
Net Income (Loss)	59.2		7.3		75.3		36.3
Net Income (Loss) Attributable to Noncontrolling Interests	0.4		1.1		1.4		2.3
Earnings Attributable to Common Shareholders	58.8		6.2		73.9		34.0
Earnings Per Share
Provision for Refund	(4.4)		(25.2)		(4.4)		(25.2)
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member]
Revenues
Revenue from Contracts with Customers	401.0		394.0		778.6		808.3
Southwestern Electric Power Co [Member] | Other Revenues [Member]
Revenues
Revenue from Contracts with Customers	0.9		0.3		1.7		0.7
TOTAL REVENUES	0.0	[5]	0.0	[6]	0.0	[7]	0.0	[8]
Southwestern Electric Power Co [Member] | Fuel and Other Consumables Used for Electric Generation [Member]
Expenses
Cost of Goods and Services Sold	85.6		117.9		174.7		251.4
Southwestern Electric Power Co [Member] | Purchased Electricity for Resale [Member]
Expenses
Cost of Goods and Services Sold	$ 41.0		$ 33.1		$ 84.1		$ 65.7

[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.

[5] Amounts include affiliated and nonaffiliated revenues.

[6] Amounts include affiliated and nonaffiliated revenues.

[7] Amounts include affiliated and nonaffiliated revenues.

[8] Amounts include affiliated and nonaffiliated revenues.