Property, Plant and Equipment (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		$ 24,329.5		$ 25,834.2
Property, Plant and Equipment, Transmission		35,934.1		33,266.9
Property, Plant and Equipment, Distribution		28,989.9		27,138.8
Property, Plant and Equipment, Other		6,484.9		5,971.8
Property, Plant and Equipment, Construction Work in Progress		5,508.0		4,809.7
Accumulated Depreciation		24,553.0		23,682.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		76,693.4		73,339.1
Asset Retirement Obligations (ARO)
Beginning Balance	[1],[2],[3],[4],[5],[6]	2,943.6		2,741.7
Accretion Expense	[1],[2],[3],[4],[5],[6]	116.3		111.2
Liabilities Incurred	[1],[2],[3],[4],[5],[6]	38.9		37.4
Liabilities Settled	[1],[2],[3],[4],[5],[6]	(130.6)		(47.0)
Revisions in Cash Flow Estimates	[1],[2],[3],[4],[5],[6],[7]	63.0		100.3
Ending Balance	[1],[2],[3],[4],[5],[6]	3,031.2		2,943.6	$ 2,741.7
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant		2,110.0		2,000.0
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization
Allowance for Equity Funds Used During Construction		174.9		133.7	139.7
Allowance for Borrowed Funds Used During Construction		117.3		63.0	53.8
Jointly-owned Electric Facilities
Utility Plant in Service		1,906.8		2,626.0
Construction Work in Progress		11.7		21.5
Accumulated Depreciation		490.8		1,096.1
Asset Impairments and Other Related Charges		85.6		48.8	11.6
Competitive Contracted Renewable Portfolio
Asset Retirement Obligations (ARO)
Liabilities Settled		(31.0)
AEP Texas Inc. [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Transmission		6,812.6		6,301.5
Property, Plant and Equipment, Distribution		5,798.8		5,312.8
Property, Plant and Equipment, Other		1,145.9		1,022.8
Property, Plant and Equipment, Construction Work in Progress		904.6		805.2
Accumulated Depreciation		1,887.9		1,760.7
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		12,774.0		11,681.6
Asset Retirement Obligations (ARO)
Beginning Balance	[3],[4]	4.5		4.4
Accretion Expense	[3],[4]	0.2		0.3
Liabilities Incurred	[3],[4]	0.0		0.0
Liabilities Settled	[3],[4]	(0.3)		(0.2)
Revisions in Cash Flow Estimates	[3],[4],[7]	0.1		0.0
Ending Balance	[3],[4]	4.5		4.5	4.4
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization
Allowance for Equity Funds Used During Construction		28.4		19.7	21.5
Allowance for Borrowed Funds Used During Construction		23.4		11.5	10.5
AEP Transmission Co [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Transmission		13,723.9		12,335.4
Property, Plant and Equipment, Other		501.4		476.8
Property, Plant and Equipment, Construction Work in Progress		1,563.7		1,554.7
Accumulated Depreciation		1,291.3		1,027.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		14,497.7		13,339.9
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization
Allowance for Equity Funds Used During Construction		83.2		70.7	67.2
Allowance for Borrowed Funds Used During Construction		31.4		22.4	21.0
Appalachian Power Co [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		7,041.3		6,776.8
Property, Plant and Equipment, Transmission		4,711.8		4,482.8
Property, Plant and Equipment, Distribution		5,176.6		4,933.0
Property, Plant and Equipment, Other		981.3		883.3
Property, Plant and Equipment, Construction Work in Progress		709.2		705.3
Accumulated Depreciation		5,688.7		5,402.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		12,931.5		12,379.2
Asset Retirement Obligations (ARO)
Beginning Balance	[3],[4]	427.7		404.6
Accretion Expense	[3],[4]	16.8		15.8
Liabilities Incurred	[3],[4]	16.1		3.0
Liabilities Settled	[3],[4]	(23.1)		(12.7)
Revisions in Cash Flow Estimates	[3],[4],[7]	26.5		17.0
Ending Balance	[3],[4]	464.0		427.7	404.6
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization
Allowance for Equity Funds Used During Construction		11.9		11.7	15.6
Allowance for Borrowed Funds Used During Construction		14.1		6.5	7.5
Jointly-owned Electric Facilities
Asset Impairments and Other Related Charges		0.0		24.9	0.0
Indiana Michigan Power Co [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		5,646.8		5,585.1
Property, Plant and Equipment, Transmission		1,906.4		1,842.2
Property, Plant and Equipment, Distribution		3,254.0		3,024.7
Property, Plant and Equipment, Other		898.5		839.3
Property, Plant and Equipment, Construction Work in Progress		301.7		253.0
Accumulated Depreciation		4,378.4		4,132.8
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		7,629.0		7,411.5
Asset Retirement Obligations (ARO)
Beginning Balance	[3],[4],[5]	2,028.1		1,946.3
Accretion Expense	[3],[4],[5]	74.8		71.5
Liabilities Incurred	[3],[4],[5]	4.8		3.2
Liabilities Settled	[3],[4],[5]	(3.7)		(0.6)
Revisions in Cash Flow Estimates	[3],[4],[5],[7]	2.0		7.7
Ending Balance	[3],[4],[5]	2,106.0		2,028.1	1,946.3
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant		2,110.0		2,000.0
Fair Value of Legally Restricted Assets		3,510.0		3,010.0
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization
Allowance for Equity Funds Used During Construction		10.9		9.8	12.8
Allowance for Borrowed Funds Used During Construction		7.7		5.7	5.1
Ohio Power Co [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Transmission		3,395.1		3,198.6
Property, Plant and Equipment, Distribution		6,839.4		6,450.3
Property, Plant and Equipment, Other		1,125.0		1,051.4
Property, Plant and Equipment, Construction Work in Progress		654.0		474.3
Accumulated Depreciation		2,713.6		2,565.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		9,299.9		8,609.3
Asset Retirement Obligations (ARO)
Beginning Balance	[4]	5.0		1.9
Accretion Expense	[4]	0.2		0.2
Liabilities Incurred	[4]	0.0		3.0
Liabilities Settled	[4]	(3.1)		(0.1)
Revisions in Cash Flow Estimates	[4],[7]	0.0		0.0
Ending Balance	[4]	2.1		5.0	1.9
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization
Allowance for Equity Funds Used During Construction		17.1		13.9	10.8
Allowance for Borrowed Funds Used During Construction		14.0		6.7	4.7
Public Service Co Of Oklahoma [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		2,695.5		2,394.8
Property, Plant and Equipment, Transmission		1,228.3		1,164.4
Property, Plant and Equipment, Distribution		3,450.8		3,216.4
Property, Plant and Equipment, Other		505.9		469.3
Property, Plant and Equipment, Construction Work in Progress		313.7		219.3
Accumulated Depreciation		2,081.9		1,837.7
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		6,112.3		5,626.5
Asset Retirement Obligations (ARO)
Beginning Balance	[1],[3],[4]	75.7		57.6
Accretion Expense	[1],[3],[4]	4.7		4.1
Liabilities Incurred	[1],[3],[4]	5.8		12.8
Liabilities Settled	[1],[3],[4]	(1.2)		(0.7)
Revisions in Cash Flow Estimates	[1],[3],[4],[7]	(0.8)		1.9
Ending Balance	[1],[3],[4]	84.2		75.7	57.6
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization
Allowance for Equity Funds Used During Construction		8.4		1.5	2.4
Allowance for Borrowed Funds Used During Construction		5.2		2.7	0.7
Southwestern Electric Power Co [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		4,790.7		5,476.2
Property, Plant and Equipment, Transmission		2,660.6		2,479.8
Property, Plant and Equipment, Distribution		2,824.1		2,659.6
Property, Plant and Equipment, Other		814.4		804.4
Property, Plant and Equipment, Construction Work in Progress		555.8		369.5
Accumulated Depreciation		3,087.2		3,527.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		8,558.4		8,262.2
Asset Retirement Obligations (ARO)
Beginning Balance	[1],[2],[3],[4]	280.9		222.7
Accretion Expense	[1],[2],[3],[4]	13.7		11.9
Liabilities Incurred	[1],[2],[3],[4]	7.5		15.4
Liabilities Settled	[1],[2],[3],[4]	(55.0)		(25.8)
Revisions in Cash Flow Estimates	[1],[2],[3],[4],[7]	34.5		56.7
Ending Balance	[1],[2],[3],[4]	281.6		280.9	222.7
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization
Allowance for Equity Funds Used During Construction		11.5		4.9	7.0
Allowance for Borrowed Funds Used During Construction		9.8		4.3	3.0
Jointly-owned Electric Facilities
Utility Plant in Service		2,993.1		3,692.8
Construction Work in Progress		14.6		31.6
Accumulated Depreciation		558.7		1,131.3
Asset Impairments and Other Related Charges		$ 85.6		$ 0.0	$ 11.6
Flint Creek Generating Station (Unit No. 1) [Member] | Coal [Member]
Jointly-owned Electric Facilities
Percent of Ownership	[8]	50.00%		50.00%
Utility Plant in Service	[8]	$ 402.8		$ 382.9
Construction Work in Progress	[8]	1.6		16.4
Accumulated Depreciation	[8]	$ 167.5		$ 149.4
Flint Creek Generating Station (Unit No. 1) [Member] | Southwestern Electric Power Co [Member] | Coal [Member]
Jointly-owned Electric Facilities
Percent of Ownership	[8]	50.00%		50.00%
Utility Plant in Service	[8]	$ 402.8		$ 382.9
Construction Work in Progress	[8]	1.6		16.4
Accumulated Depreciation	[8]	$ 167.5		$ 149.4
Pirkey Generating Station (Unit No. 1) [Member] | Public Utilities, Inventory, Lignite [Member]
Jointly-owned Electric Facilities
Percent of Ownership	[8]	85.90%	[9]	85.90%
Utility Plant in Service	[8]	$ 0.0	[9]	$ 632.0
Construction Work in Progress	[8]	0.0	[9]	0.0
Accumulated Depreciation	[8]	$ 0.0	[9]	$ 632.0
Pirkey Generating Station (Unit No. 1) [Member] | Southwestern Electric Power Co [Member] | Public Utilities, Inventory, Lignite [Member]
Jointly-owned Electric Facilities
Percent of Ownership	[8]	85.90%	[9]	85.90%
Utility Plant in Service	[8]	$ 0.0	[9]	$ 632.0
Construction Work in Progress	[8]	0.0	[9]	0.0
Accumulated Depreciation	[8]	$ 0.0	[9]	$ 632.0
Turk Generating Plant [Member] | Coal [Member]
Jointly-owned Electric Facilities
Percent of Ownership	[8]	73.30%	[10]	73.30%
Utility Plant in Service	[8]	$ 1,504.0	[10]	$ 1,611.1
Construction Work in Progress	[8]	10.1	[10]	5.1
Accumulated Depreciation	[8]	$ 323.3	[10]	$ 314.7
Turk Generating Plant [Member] | Southwestern Electric Power Co [Member] | Coal [Member]
Jointly-owned Electric Facilities
Percent of Ownership	[8]	73.30%	[10]	73.30%
Utility Plant in Service	[8]	$ 1,504.0	[10]	$ 1,611.1
Construction Work in Progress	[8]	10.1	[10]	5.1
Accumulated Depreciation	[8]	$ 323.3	[10]	$ 314.7
NCWF [Member] | Public Service Co Of Oklahoma [Member]
Jointly-owned Electric Facilities
Percent of Ownership		45.50%
NCWF [Member] | Public Service Co Of Oklahoma [Member] | Wind [Member]
Jointly-owned Electric Facilities
Percent of Ownership	[11],[12]	45.50%		45.50%
Utility Plant in Service	[11],[12]	$ 906.3		$ 889.3
Construction Work in Progress	[11],[12]	2.4		9.1
Accumulated Depreciation	[11],[12]	$ 54.1		$ 28.1
NCWF [Member] | Southwestern Electric Power Co [Member]
Jointly-owned Electric Facilities
Percent of Ownership		54.50%
NCWF [Member] | Southwestern Electric Power Co [Member] | Wind [Member]
Jointly-owned Electric Facilities
Percent of Ownership	[11],[12]	54.50%		54.50%
Utility Plant in Service	[11],[12]	$ 1,086.3		$ 1,066.8
Construction Work in Progress	[11],[12]	2.9		10.1
Accumulated Depreciation	[11],[12]	$ 67.9		$ 35.2
Rockport Generating Plant | Indiana Michigan Power Co [Member] | Coal [Member]
Jointly-owned Electric Facilities
Percent of Ownership	[13],[14]	50.00%		50.00%
Utility Plant in Service	[13],[14]	$ 1,341.4		$ 1,357.4
Construction Work in Progress	[13],[14]	7.9		9.2
Accumulated Depreciation	[13],[14]	$ 1,018.9		905.1
Rockport Generating Plant | AEP Generating Co [Member]
Jointly-owned Electric Facilities
Percent of Ownership		50.00%
Regulated Operation [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation	[15]	$ 23,862.7		23,759.7
Property, Plant and Equipment, Transmission		35,903.6		33,221.7
Property, Plant and Equipment, Distribution		28,989.9		27,138.8
Property, Plant and Equipment, Other		5,986.1		5,528.9
Property, Plant and Equipment, Construction Work in Progress	[15]	5,480.6		4,776.4
Accumulated Depreciation		24,093.8		23,118.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		$ 76,129.1		$ 71,307.5
Regulated Operation [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		162 years		132 years	132 years
Depreciable Life Ranges - Transmission		78 years		75 years	75 years
Depreciable Life Ranges - Distribution		85 years		78 years	80 years
Depreciable Life Ranges - Other		75 years		75 years	75 years
Regulated Operation [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		20 years		20 years	20 years
Depreciable Life Ranges - Transmission		15 years		24 years	15 years
Depreciable Life Ranges - Distribution		7 years		7 years	7 years
Depreciable Life Ranges - Other		5 years		5 years	5 years
Regulated Operation [Member] | Generation [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		4.70%		7.60%	7.80%
Regulated Operation [Member] | Generation [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.70%		2.70%	2.70%
Regulated Operation [Member] | Transmission [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.70%		2.70%	2.60%
Regulated Operation [Member] | Transmission [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.00%		2.00%	2.00%
Regulated Operation [Member] | Distribution [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		3.60%		3.60%	3.60%
Regulated Operation [Member] | Distribution [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.90%		2.70%	2.80%
Regulated Operation [Member] | Other Property Class [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		9.10%		14.40%	12.50%
Regulated Operation [Member] | Other Property Class [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		3.80%		3.10%	3.00%
Regulated Operation [Member] | AEP Texas Inc. [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		$ 0.0		$ 0.0
Property, Plant and Equipment, Transmission		6,812.6		6,301.5
Property, Plant and Equipment, Distribution		5,798.8		5,312.8
Property, Plant and Equipment, Other		1,142.9		1,020.4
Property, Plant and Equipment, Construction Work in Progress		904.6		805.2
Accumulated Depreciation		1,886.7		1,759.5
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		$ 12,772.2		$ 11,680.4
Regulated Operation [Member] | AEP Texas Inc. [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Transmission		75 years		75 years	75 years
Depreciable Life Ranges - Distribution		70 years		70 years	70 years
Depreciable Life Ranges - Other		50 years		50 years	50 years
Regulated Operation [Member] | AEP Texas Inc. [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Transmission		50 years		50 years	50 years
Depreciable Life Ranges - Distribution		7 years		7 years	7 years
Depreciable Life Ranges - Other		5 years		5 years	5 years
Regulated Operation [Member] | AEP Texas Inc. [Member] | Transmission [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.20%		2.20%	2.20%
Regulated Operation [Member] | AEP Texas Inc. [Member] | Distribution [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.90%		2.90%	2.90%
Regulated Operation [Member] | AEP Texas Inc. [Member] | Other Property Class [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		6.00%		6.20%	5.80%
Regulated Operation [Member] | AEP Transmission Co [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		$ 0.0		$ 0.0
Property, Plant and Equipment, Transmission		13,723.9		12,335.4
Property, Plant and Equipment, Distribution		0.0		0.0
Property, Plant and Equipment, Other		501.2		476.6
Property, Plant and Equipment, Construction Work in Progress		1,563.7		1,554.7
Accumulated Depreciation		1,291.4		1,027.1
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		$ 14,497.4		$ 13,339.6
Regulated Operation [Member] | AEP Transmission Co [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Transmission		78 years		75 years	75 years
Depreciable Life Ranges - Other		58 years		56 years	56 years
Regulated Operation [Member] | AEP Transmission Co [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Transmission		24 years		24 years	24 years
Depreciable Life Ranges - Other		5 years		5 years	5 years
Regulated Operation [Member] | AEP Transmission Co [Member] | Transmission [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.60%		2.60%	2.50%
Regulated Operation [Member] | AEP Transmission Co [Member] | Other Property Class [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		7.00%		6.60%	6.70%
Regulated Operation [Member] | Appalachian Power Co [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		$ 7,041.3		$ 6,776.8
Property, Plant and Equipment, Transmission		4,711.8		4,482.8
Property, Plant and Equipment, Distribution		5,176.6		4,933.0
Property, Plant and Equipment, Other		943.7		849.2
Property, Plant and Equipment, Construction Work in Progress		709.2		705.3
Accumulated Depreciation		5,684.0		5,397.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		$ 12,898.6		$ 12,349.8
Regulated Operation [Member] | Appalachian Power Co [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		162 years		118 years	118 years
Depreciable Life Ranges - Transmission		78 years		75 years	75 years
Depreciable Life Ranges - Distribution		60 years		57 years	57 years
Depreciable Life Ranges - Other		55 years		55 years	55 years
Regulated Operation [Member] | Appalachian Power Co [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		35 years		35 years	35 years
Depreciable Life Ranges - Transmission		15 years		24 years	15 years
Depreciable Life Ranges - Distribution		12 years		12 years	12 years
Depreciable Life Ranges - Other		5 years		5 years	5 years
Regulated Operation [Member] | Appalachian Power Co [Member] | Generation [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		3.30%		3.60%	3.60%
Regulated Operation [Member] | Appalachian Power Co [Member] | Transmission [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.30%		2.20%	2.10%
Regulated Operation [Member] | Appalachian Power Co [Member] | Distribution [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		3.60%		3.60%	3.50%
Regulated Operation [Member] | Appalachian Power Co [Member] | Other Property Class [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		7.40%		7.30%	8.50%
Regulated Operation [Member] | Indiana Michigan Power Co [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		$ 5,588.7		$ 5,534.6
Property, Plant and Equipment, Transmission		1,906.4		1,842.2
Property, Plant and Equipment, Distribution		3,254.0		3,024.7
Property, Plant and Equipment, Other		856.8		796.1
Property, Plant and Equipment, Construction Work in Progress		294.1		253.0
Accumulated Depreciation		4,353.7		4,117.8
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		$ 7,546.3		$ 7,332.8
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		132 years		132 years	132 years
Depreciable Life Ranges - Transmission		67 years		67 years	70 years
Depreciable Life Ranges - Distribution		71 years		71 years	71 years
Depreciable Life Ranges - Other		45 years		45 years	51 years
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		20 years		20 years	20 years
Depreciable Life Ranges - Transmission		44 years		44 years	45 years
Depreciable Life Ranges - Distribution		14 years		14 years	14 years
Depreciable Life Ranges - Other		5 years		5 years	5 years
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Generation [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		4.70%		4.90%	4.70%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Transmission [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.50%		2.50%	2.40%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Distribution [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.90%		3.10%	3.40%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Other Property Class [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		9.10%		10.10%	9.00%
Regulated Operation [Member] | Ohio Power Co [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		$ 0.0		$ 0.0
Property, Plant and Equipment, Transmission		3,395.1		3,198.6
Property, Plant and Equipment, Distribution		6,839.4		6,450.3
Property, Plant and Equipment, Other		1,114.4		1,040.6
Property, Plant and Equipment, Construction Work in Progress		654.0		474.3
Accumulated Depreciation		2,712.7		2,564.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		$ 9,290.2		$ 8,599.5
Regulated Operation [Member] | Ohio Power Co [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Transmission		60 years		60 years	60 years
Depreciable Life Ranges - Distribution		70 years		70 years	70 years
Depreciable Life Ranges - Other		50 years		50 years	50 years
Regulated Operation [Member] | Ohio Power Co [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Transmission		39 years		39 years	39 years
Depreciable Life Ranges - Distribution		11 years		11 years	11 years
Depreciable Life Ranges - Other		5 years		5 years	5 years
Regulated Operation [Member] | Ohio Power Co [Member] | Transmission [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.30%		2.30%	2.30%
Regulated Operation [Member] | Ohio Power Co [Member] | Distribution [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		3.10%		2.70%	2.90%
Regulated Operation [Member] | Ohio Power Co [Member] | Other Property Class [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		6.40%		6.10%	6.10%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation		$ 2,695.5		$ 2,394.8
Property, Plant and Equipment, Transmission		1,228.3		1,164.4
Property, Plant and Equipment, Distribution		3,450.8		3,216.4
Property, Plant and Equipment, Other		502.7		466.0
Property, Plant and Equipment, Construction Work in Progress		313.7		219.3
Accumulated Depreciation		2,083.6		1,839.4
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		$ 6,107.4		$ 5,621.5
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		75 years		75 years	75 years
Depreciable Life Ranges - Transmission		75 years		75 years	75 years
Depreciable Life Ranges - Distribution		85 years		78 years	78 years
Depreciable Life Ranges - Other		58 years		56 years	56 years
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		25 years		30 years	30 years
Depreciable Life Ranges - Transmission		41 years		42 years	42 years
Depreciable Life Ranges - Distribution		15 years		15 years	15 years
Depreciable Life Ranges - Other		5 years		5 years	5 years
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Generation [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		3.00%		3.10%	2.80%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Transmission [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.60%		2.50%	2.40%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Distribution [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.90%		2.90%	2.90%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Other Property Class [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		6.80%		6.80%	6.10%
Regulated Operation [Member] | Southwestern Electric Power Co [Member]
Depreciation, Depletion and Amortization
Property, Plant and Equipment, Generation	[15]	$ 4,790.7		$ 5,476.2
Property, Plant and Equipment, Transmission		2,660.6		2,479.8
Property, Plant and Equipment, Distribution		2,824.1		2,659.6
Property, Plant and Equipment, Other		544.1		582.6
Property, Plant and Equipment, Construction Work in Progress	[15]	555.8		369.5
Accumulated Depreciation		2,840.8		3,314.8
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		$ 8,534.5		$ 8,252.9
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		65 years		65 years	65 years
Depreciable Life Ranges - Transmission		70 years		70 years	74 years
Depreciable Life Ranges - Distribution		75 years		75 years	80 years
Depreciable Life Ranges - Other		58 years		57 years	58 years
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		30 years		30 years	30 years
Depreciable Life Ranges - Transmission		46 years		44 years	49 years
Depreciable Life Ranges - Distribution		7 years		15 years	15 years
Depreciable Life Ranges - Other		5 years		5 years	5 years
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Generation [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.90%		2.70%	2.70%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Transmission [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.20%		2.30%	2.40%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Distribution [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.90%		2.90%	2.80%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Other Property Class [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		8.50%		9.00%	8.60%
Unregulated Operation [Member]
Depreciation, Depletion and Amortization
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		$ 564.3		$ 2,031.6
Unregulated Operation [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		61 years		61 years	59 years
Depreciable Life Ranges - Transmission				62 years	40 years
Depreciable Life Ranges - Other	[16]	35 years		35 years	35 years
Unregulated Operation [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Depreciable Life Ranges - Generation		10 years		3 years	10 years
Depreciable Life Ranges - Transmission		62 years		10 years	30 years
Depreciable Life Ranges - Other	[16]	5 years		5 years	5 years
Unregulated Operation [Member] | Generation [Member] | Maximum [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		6.70%		8.70%	10.40%
Unregulated Operation [Member] | Generation [Member] | Minimum [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		4.80%		3.80%	3.80%
Unregulated Operation [Member] | Transmission [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		2.50%		2.80%	2.60%
Unregulated Operation [Member] | Other Property Class [Member]
Depreciation, Depletion and Amortization
Annual Composite Depreciation Rate		10.60%		25.20%	16.50%
Unregulated Operation [Member] | AEP Texas Inc. [Member]
Depreciation, Depletion and Amortization
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		$ 1.8		$ 1.2
Unregulated Operation [Member] | AEP Transmission Co [Member]
Depreciation, Depletion and Amortization
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		0.3		0.3
Unregulated Operation [Member] | Appalachian Power Co [Member]
Depreciation, Depletion and Amortization
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		32.9		29.4
Unregulated Operation [Member] | Indiana Michigan Power Co [Member]
Depreciation, Depletion and Amortization
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		82.7		78.7
Unregulated Operation [Member] | Ohio Power Co [Member]
Depreciation, Depletion and Amortization
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		9.7		9.8
Unregulated Operation [Member] | Public Service Co Of Oklahoma [Member]
Depreciation, Depletion and Amortization
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		4.9		5.0
Unregulated Operation [Member] | Southwestern Electric Power Co [Member]
Depreciation, Depletion and Amortization
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		23.9		9.3
Cook Nuclear Plant [Member] | Indiana Michigan Power Co [Member]
Asset Retirement Obligations (ARO)
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant		2,110.0		2,000.0
Amos Plant | Appalachian Power Co [Member]
Asset Retirement Obligations (ARO)
Revisions in Cash Flow Estimates				14.0
Traverse [Member] | Public Service Co Of Oklahoma [Member]
Asset Retirement Obligations (ARO)
Liabilities Incurred				13.0
Traverse [Member] | Southwestern Electric Power Co [Member]
Asset Retirement Obligations (ARO)
Liabilities Incurred				15.0
Pirkey Power Plant | Southwestern Electric Power Co [Member]
Asset Retirement Obligations (ARO)
Revisions in Cash Flow Estimates				13.0
Sabine Mining Co [Member] | Southwestern Electric Power Co [Member]
Property, Plant and Equipment (Textuals)
Asset Retirement Obligation, Revision of Estimate, Estimated Reclamation Costs - 1		32.0		16.0
Asset Retirement Obligation, Revision of Estimate, Estimated Reclamation Costs - 2				7.0
Pirkey Power Plant | Southwestern Electric Power Co [Member]
Asset Retirement Obligations (ARO)
Revisions in Cash Flow Estimates				14.0
Pirkey Power Plant and Dolet Hills Power Station | Southwestern Electric Power Co [Member]
Asset Retirement Obligations (ARO)
Liabilities Settled		(50.0)
Various Plants | Appalachian Power Co [Member]
Asset Retirement Obligations (ARO)
Revisions in Cash Flow Estimates		27.0
Generation and Marketing [Member]
Jointly-owned Electric Facilities
Asset Impairments and Other Related Charges		$ 0.0		$ 0.0	$ 0.0

[1] Includes ARO related to wind farms.

[2] Includes ARO related to Sabine and DHLC.

[3] Includes ARO related to ash disposal facilities.

[4] Includes ARO related to asbestos removal.

[5] Includes ARO related to nuclear decommissioning costs for the Cook Plant of $2.11 billion and $2 billion as of December 31, 2023 and 2022, respectively.

[6] Includes ARO related to solar farms.

[7] Unless discussed above, primarily related to ash ponds, landfills and mine reclamation, generally due to changes in estimated closure area, volumes and/or unit costs.

[8] Operated by SWEPCo.

[9] Pirkey Plant was retired in March 2023. See "Coal-Fired Generation Plants" of Note 5 for additional information.

[10] Includes impact of regulatory disallowance of AFUDC. See “2012 Texas Base Rate Case” section of Note 4 for additional information.

[11] Operated by PSO.

[12] PSO and SWEPCo own undivided interests of 45.5% and 54.5% of the NCWF, respectively.

[13] Operated by I&M.

[14] AEGCo owns 50%.

[15] AEP and SWEPCo’s regulated generation and regulated CWIP include amounts related to SWEPCo’s Arkansas jurisdictional share of the Turk Plant.

[16] In 2020, management announced plans to retire the Pirkey Plant in 2023 and the related depreciable lives have been adjusted accordingly. Pirkey Plant was retired in March 2023. See "Coal-Fired Generation Plants" of Note 5 for additional information.