Derivatives and Hedging (Details) gal in Millions, MWh in Millions, MMBTU in Millions		12 Months Ended
		Dec. 31, 2023 USD ($) MWh MMBTU gal		Dec. 31, 2022 USD ($) MMBTU MWh gal		Dec. 31, 2021 USD ($)
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		$ 46,000,000		$ 481,000,000
Fair Value of Derivative Instruments
Current Risk Management Assets		217,500,000		348,800,000
Derivative Asset, Noncurrent		321,200,000		284,100,000
Total Assets		538,700,000		632,900,000
Current Risk Management Liabilities		229,600,000		145,200,000
Derivative Liability, Noncurrent		241,800,000		345,200,000
Total Liabilities		471,400,000		490,400,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(322,800,000)		693,700,000		$ 324,000,000.0
Impact of Fair Value Hedges on the Balance Sheet
Carrying Amount of Hedged Asset (Liability)	[1],[2]	(878,200,000)		(855,500,000)
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)	[1],[2]	68,400,000		89,700,000
Gain (Loss) on Hedging Instruments
Gain (Loss) on Fair Value Instruments	[3]	29,000,000.0		(90,400,000)		(35,500,000)
Gain (Loss) on Fair Value Portion of Long Term Debt	[3]	(29,000,000.0)		90,400,000		35,500,000
Collateral Triggering Events
Fair Value Of Derivative Liabilities Subject To Cross Acceleration Provisions		107,000,000		127,000,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements		242,000,000		217,000,000
Derivatives and Hedging (Textuals)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)		(30,000,000)		(38,000,000)
Credit Downgrade Trigger Exposure		0		2,000,000
AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Total Liabilities		2,700,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(600,000)		2,800,000		2,000,000.0
Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		22,400,000		69,100,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(18,600,000)		88,600,000		55,300,000
Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		27,800,000		15,200,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		29,200,000		19,600,000		(18,200,000)
Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Liabilities		6,800,000		1,800,000
Derivative Liability, Noncurrent		43,900,000		37,900,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(14,100,000)		57,800,000		11,100,000
Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		19,000,000.0		25,300,000
Current Risk Management Liabilities		28,900,000		1,600,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		58,800,000		103,700,000		46,000,000.0
Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		11,600,000		16,400,000
Current Risk Management Liabilities		14,400,000		1,400,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		55,000,000.0		77,700,000		41,500,000
Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Total Assets	[5]	403,900,000	[4]	315,400,000	[6]
Total Liabilities	[5]	362,300,000	[4]	339,800,000	[6]
Risk Management Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Total Liabilities	[5]	0
Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[5]	22,400,000		69,100,000
Total Liabilities	[5]	22,500,000		3,500,000
Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[5]	39,600,000		15,400,000
Total Liabilities	[5]	2,000,000.0		0
Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Total Liabilities	[5]	50,700,000		39,700,000
Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Total Assets	[5]	19,000,000.0		25,300,000
Total Liabilities	[5]	29,900,000		1,600,000
Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[5]	11,600,000		16,400,000
Total Liabilities	[5]	15,600,000		1,400,000
Commodity [Member]
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		104,900,000		223,500,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		$ 38,300,000		119,900,000
Derivatives and Hedging (Textuals)
Maximum Length of Time Hedged in Price Risk Cash Flow Hedge		87 months
Cross Default Provisions Maximum Third Party Obligation Amount		$ 50,000,000
Cross Acceleration Provisions Maximum Third Party Obligation Amount		50,000,000
Commodity [Member] | AEP Texas Inc. [Member]
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		0		0
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		0		0
Commodity [Member] | Appalachian Power Co [Member]
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		0		0
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		0		0
Commodity [Member] | Indiana Michigan Power Co [Member]
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		0		0
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		0		0
Commodity [Member] | Public Service Co Of Oklahoma [Member]
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		0		0
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		0		0
Commodity [Member] | Southwestern Electric Power Co [Member]
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		0		0
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		0		0
Commodity [Member] | Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		555,100,000		965,400,000
Derivative Asset, Noncurrent		468,800,000		565,600,000
Current Risk Management Liabilities		588,000,000.0		663,800,000
Derivative Liability, Noncurrent		377,600,000		412,000,000.0
Commodity [Member] | Risk Management Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		200,000		0
Derivative Liability, Noncurrent		0		0
Commodity [Member] | Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		24,600,000		69,300,000
Derivative Asset, Noncurrent		300,000		700,000
Current Risk Management Liabilities		18,500,000		4,100,000
Derivative Liability, Noncurrent		6,900,000		700,000
Commodity [Member] | Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		30,100,000		16,000,000.0
Derivative Asset, Noncurrent		12,000,000.0		500,000
Current Risk Management Liabilities		5,400,000		900,000
Derivative Liability, Noncurrent		200,000		300,000
Commodity [Member] | Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		6,900,000		2,100,000
Derivative Liability, Noncurrent		43,900,000		37,900,000
Commodity [Member] | Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		19,700,000		24,100,000
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		29,700,000		2,100,000
Derivative Liability, Noncurrent		1,000,000.0		0
Commodity [Member] | Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		12,000,000.0		16,800,000
Derivative Asset, Noncurrent		500,000		0
Current Risk Management Liabilities		14,900,000		2,000,000.0
Derivative Liability, Noncurrent		1,700,000		0
Commodity [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		56,700,000		212,200,000
Derivative Asset, Noncurrent		86,800,000		148,900,000
Current Risk Management Liabilities		8,200,000		60,400,000
Derivative Liability, Noncurrent		2,200,000		17,400,000
Commodity [Member] | Hedging Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Commodity [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Commodity [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Commodity [Member] | Hedging Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Commodity [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Commodity [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Interest Rate [Member]
Commodity
Derivative, Notional Amount		1,300,000,000		1,650,000,000
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		(8,100,000)		300,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		3,200,000		300,000
Interest Rate [Member] | AEP Texas Inc. [Member]
Commodity
Derivative, Notional Amount		150,000,000.0		0
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		500,000		(300,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		200,000		(200,000)
Interest Rate [Member] | Appalachian Power Co [Member]
Commodity
Derivative, Notional Amount		0		0
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		5,900,000		6,700,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		800,000		800,000
Interest Rate [Member] | Indiana Michigan Power Co [Member]
Commodity
Derivative, Notional Amount		0		0
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		(5,500,000)		(5,100,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		(400,000)		(600,000)
Interest Rate [Member] | Ohio Power Co [Member]
Commodity
Derivative, Notional Amount		0		0
Interest Rate [Member] | Public Service Co Of Oklahoma [Member]
Commodity
Derivative, Notional Amount		0		200,000,000.0
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		(200,000)		1,300,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		0		100,000
Interest Rate [Member] | Southwestern Electric Power Co [Member]
Commodity
Derivative, Notional Amount		0		0
Impact of Cash Flow Hedges on the Balance Sheet
AOCI Gain (Loss) Net of Tax		1,300,000		1,100,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		300,000		200,000
Interest Rate [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		1,800,000
Derivative Asset, Noncurrent		0		14,300,000
Current Risk Management Liabilities		50,500,000		41,400,000
Derivative Liability, Noncurrent		56,900,000		91,100,000
Interest Rate [Member] | Hedging Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		2,700,000		0
Derivative Liability, Noncurrent		0		0
Interest Rate [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Interest Rate [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Interest Rate [Member] | Hedging Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Interest Rate [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		1,600,000
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Interest Rate [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		0		0
Derivative Liability, Noncurrent		0		0
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		611,800,000		1,179,400,000
Derivative Asset, Noncurrent		555,600,000		728,800,000
Total Assets		1,167,400,000		1,908,200,000
Current Risk Management Liabilities		646,700,000		765,600,000
Derivative Liability, Noncurrent		436,700,000		520,500,000
Total Liabilities		1,083,400,000		1,286,100,000
Total MTM Derivative Contract Net Assets (Liabilities)		84,000,000.0		622,100,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Total Assets		0		0
Current Risk Management Liabilities		2,900,000		0
Derivative Liability, Noncurrent		0		0
Total Liabilities		2,900,000		0
Total MTM Derivative Contract Net Assets (Liabilities)		(2,900,000)		0
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		24,600,000		69,300,000
Derivative Asset, Noncurrent		300,000		700,000
Total Assets		24,900,000		70,000,000.0
Current Risk Management Liabilities		18,500,000		4,100,000
Derivative Liability, Noncurrent		6,900,000		700,000
Total Liabilities		25,400,000		4,800,000
Total MTM Derivative Contract Net Assets (Liabilities)		(500,000)		65,200,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		30,100,000		16,000,000.0
Derivative Asset, Noncurrent		12,000,000.0		500,000
Total Assets		42,100,000		16,500,000
Current Risk Management Liabilities		5,400,000		900,000
Derivative Liability, Noncurrent		200,000		300,000
Total Liabilities		5,600,000		1,200,000
Total MTM Derivative Contract Net Assets (Liabilities)		36,500,000		15,300,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Total Assets		0		0
Current Risk Management Liabilities		6,900,000		2,100,000
Derivative Liability, Noncurrent		43,900,000		37,900,000
Total Liabilities		50,800,000		40,000,000.0
Total MTM Derivative Contract Net Assets (Liabilities)		(50,800,000)		(40,000,000.0)
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		19,700,000		25,700,000
Derivative Asset, Noncurrent		0		0
Total Assets		19,700,000		25,700,000
Current Risk Management Liabilities		29,700,000		2,100,000
Derivative Liability, Noncurrent		1,000,000.0		0
Total Liabilities		30,700,000		2,100,000
Total MTM Derivative Contract Net Assets (Liabilities)		(11,000,000.0)		23,600,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		12,000,000.0		16,800,000
Derivative Asset, Noncurrent		500,000		0
Total Assets		12,500,000		16,800,000
Current Risk Management Liabilities		14,900,000		2,000,000.0
Derivative Liability, Noncurrent		1,700,000		0
Total Liabilities		16,600,000		2,000,000.0
Total MTM Derivative Contract Net Assets (Liabilities)		(4,100,000)		14,800,000
Gross Amounts Offset in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		(394,300,000)		(830,600,000)
Derivative Asset, Noncurrent		(234,400,000)		(444,700,000)
Current Risk Management Liabilities		(417,100,000)		(620,400,000)
Derivative Liability, Noncurrent		(194,900,000)		(175,300,000)
Gross Amounts Offset in the Statement of Financial Position [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		(200,000)		0
Derivative Liability, Noncurrent		0		0
Gross Amounts Offset in the Statement of Financial Position [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		(2,200,000)		(200,000)
Derivative Asset, Noncurrent		(300,000)		(700,000)
Current Risk Management Liabilities		(2,600,000)		(500,000)
Derivative Liability, Noncurrent		(300,000)		(600,000)
Gross Amounts Offset in the Statement of Financial Position [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		(2,300,000)		(800,000)
Derivative Asset, Noncurrent		(200,000)		(300,000)
Current Risk Management Liabilities		(3,400,000)		(900,000)
Derivative Liability, Noncurrent		(200,000)		(300,000)
Gross Amounts Offset in the Statement of Financial Position [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		(100,000)		(300,000)
Derivative Liability, Noncurrent		0		0
Gross Amounts Offset in the Statement of Financial Position [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		(700,000)		(400,000)
Derivative Asset, Noncurrent		0		0
Current Risk Management Liabilities		(800,000)		(500,000)
Derivative Liability, Noncurrent		0		0
Gross Amounts Offset in the Statement of Financial Position [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		(400,000)		(400,000)
Derivative Asset, Noncurrent		(500,000)		0
Current Risk Management Liabilities		(500,000)		(600,000)
Derivative Liability, Noncurrent		(500,000)		0
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		217,500,000		348,800,000
Derivative Asset, Noncurrent		321,200,000		284,100,000
Total Assets		538,700,000		632,900,000
Current Risk Management Liabilities		229,600,000		145,200,000
Derivative Liability, Noncurrent		241,800,000		345,200,000
Total Liabilities		471,400,000		490,400,000
Total MTM Derivative Contract Net Assets (Liabilities)		67,300,000		142,500,000
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Total Assets		0		0
Current Risk Management Liabilities		2,700,000		0
Derivative Liability, Noncurrent		0		0
Total Liabilities		2,700,000		0
Total MTM Derivative Contract Net Assets (Liabilities)		(2,700,000)		0
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		22,400,000		69,100,000
Derivative Asset, Noncurrent		0		0
Total Assets		22,400,000		69,100,000
Current Risk Management Liabilities		15,900,000		3,600,000
Derivative Liability, Noncurrent		6,600,000		100,000
Total Liabilities		22,500,000		3,700,000
Total MTM Derivative Contract Net Assets (Liabilities)		(100,000)		65,400,000
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		27,800,000		15,200,000
Derivative Asset, Noncurrent		11,800,000		200,000
Total Assets		39,600,000		15,400,000
Current Risk Management Liabilities		2,000,000.0		0
Derivative Liability, Noncurrent		0		0
Total Liabilities		2,000,000.0		0
Total MTM Derivative Contract Net Assets (Liabilities)		37,600,000		15,400,000
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0		0
Derivative Asset, Noncurrent		0		0
Total Assets		0		0
Current Risk Management Liabilities		6,800,000		1,800,000
Derivative Liability, Noncurrent		43,900,000		37,900,000
Total Liabilities		50,700,000		39,700,000
Total MTM Derivative Contract Net Assets (Liabilities)		(50,700,000)		(39,700,000)
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		19,000,000.0		25,300,000
Derivative Asset, Noncurrent		0		0
Total Assets		19,000,000.0		25,300,000
Current Risk Management Liabilities		28,900,000		1,600,000
Derivative Liability, Noncurrent		1,000,000.0		0
Total Liabilities		29,900,000		1,600,000
Total MTM Derivative Contract Net Assets (Liabilities)		(10,900,000)		23,700,000
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		11,600,000		16,400,000
Derivative Asset, Noncurrent		0		0
Total Assets		11,600,000		16,400,000
Current Risk Management Liabilities		14,400,000		1,400,000
Derivative Liability, Noncurrent		1,200,000		0
Total Liabilities		15,600,000		1,400,000
Total MTM Derivative Contract Net Assets (Liabilities)		$ (4,000,000.0)		$ 15,000,000.0
Power [Member]
Commodity
Derivative, Energy Notional Amount | MWh		246.8		226.8
Power [Member] | AEP Texas Inc. [Member]
Commodity
Derivative, Energy Notional Amount | MWh		0.0		0.0
Power [Member] | Appalachian Power Co [Member]
Commodity
Derivative, Energy Notional Amount | MWh		16.8		17.9
Power [Member] | Indiana Michigan Power Co [Member]
Commodity
Derivative, Energy Notional Amount | MWh		5.9		4.2
Power [Member] | Ohio Power Co [Member]
Commodity
Derivative, Energy Notional Amount | MWh		2.2		2.5
Power [Member] | Public Service Co Of Oklahoma [Member]
Commodity
Derivative, Energy Notional Amount | MWh		4.1		2.9
Power [Member] | Southwestern Electric Power Co [Member]
Commodity
Derivative, Energy Notional Amount | MWh		2.9		2.2
Natural Gas [Member]
Commodity
Derivative, Energy Notional Amount | MMBTU		151.6		77.1
Natural Gas [Member] | AEP Texas Inc. [Member]
Commodity
Derivative, Energy Notional Amount | MMBTU		0.0		0.0
Natural Gas [Member] | Appalachian Power Co [Member]
Commodity
Derivative, Energy Notional Amount | MMBTU		37.3		1.9
Natural Gas [Member] | Indiana Michigan Power Co [Member]
Commodity
Derivative, Energy Notional Amount | MMBTU		0.0		0.0
Natural Gas [Member] | Ohio Power Co [Member]
Commodity
Derivative, Energy Notional Amount | MMBTU		0.0		0.0
Natural Gas [Member] | Public Service Co Of Oklahoma [Member]
Commodity
Derivative, Energy Notional Amount | MMBTU		34.9		1.9
Natural Gas [Member] | Southwestern Electric Power Co [Member]
Commodity
Derivative, Energy Notional Amount | MMBTU		17.9		2.1
Heating Oil and Gasoline [Member]
Commodity
Derivative, Volume Notional Amount | gal		6.5		6.9
Heating Oil and Gasoline [Member] | AEP Texas Inc. [Member]
Commodity
Derivative, Volume Notional Amount | gal		1.8		1.9
Heating Oil and Gasoline [Member] | Appalachian Power Co [Member]
Commodity
Derivative, Volume Notional Amount | gal		1.0		1.0
Heating Oil and Gasoline [Member] | Indiana Michigan Power Co [Member]
Commodity
Derivative, Volume Notional Amount | gal		0.6		0.7
Heating Oil and Gasoline [Member] | Ohio Power Co [Member]
Commodity
Derivative, Volume Notional Amount | gal		1.2		1.4
Heating Oil and Gasoline [Member] | Public Service Co Of Oklahoma [Member]
Commodity
Derivative, Volume Notional Amount | gal		0.7		0.9
Heating Oil and Gasoline [Member] | Southwestern Electric Power Co [Member]
Commodity
Derivative, Volume Notional Amount | gal		0.9		1.0
Interest Rate Contract [Member]
Commodity
Derivative, Notional Amount		$ 80,100,000		$ 99,900,000
Interest Rate Contract [Member] | AEP Texas Inc. [Member]
Commodity
Derivative, Notional Amount		0		0
Interest Rate Contract [Member] | Appalachian Power Co [Member]
Commodity
Derivative, Notional Amount		0		0
Interest Rate Contract [Member] | Indiana Michigan Power Co [Member]
Commodity
Derivative, Notional Amount		0		0
Interest Rate Contract [Member] | Ohio Power Co [Member]
Commodity
Derivative, Notional Amount		0		0
Interest Rate Contract [Member] | Public Service Co Of Oklahoma [Member]
Commodity
Derivative, Notional Amount		0		0
Interest Rate Contract [Member] | Southwestern Electric Power Co [Member]
Commodity
Derivative, Notional Amount		0		0
Vertically Integrated Utilities Revenues [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		24,600,000		11,100,000		(600,000)
Vertically Integrated Utilities Revenues [Member] | AEP Texas Inc. [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Vertically Integrated Utilities Revenues [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Vertically Integrated Utilities Revenues [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Vertically Integrated Utilities Revenues [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Vertically Integrated Utilities Revenues [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Vertically Integrated Utilities Revenues [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Generation and Marketing Revenues [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(423,800,000)		313,800,000		169,100,000
Generation and Marketing Revenues [Member] | AEP Texas Inc. [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Generation and Marketing Revenues [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Generation and Marketing Revenues [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Generation and Marketing Revenues [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Generation and Marketing Revenues [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Generation and Marketing Revenues [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Electric Generation, Transmission and Distribution Revenues [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Electric Generation, Transmission and Distribution Revenues [Member] | AEP Texas Inc. [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Electric Generation, Transmission and Distribution Revenues [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		100,000		500,000		(500,000)
Electric Generation, Transmission and Distribution Revenues [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		24,500,000		10,600,000		(100,000)
Electric Generation, Transmission and Distribution Revenues [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Electric Generation, Transmission and Distribution Revenues [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Electric Generation, Transmission and Distribution Revenues [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member)
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		2,500,000		5,000,000.0		2,000,000.0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | AEP Texas Inc. [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		2,300,000		4,500,000		1,800,000
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		100,000		100,000		0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		200,000		0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (Member) | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		0		0
Other Operation Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(200,000)		4,800,000		2,800,000
Other Operation Expense [Member] | AEP Texas Inc. [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(100,000)		1,500,000		800,000
Other Operation Expense [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		400,000		300,000
Other Operation Expense [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		500,000		300,000
Other Operation Expense [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		800,000		500,000
Other Operation Expense [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		600,000		300,000
Other Operation Expense [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		0		800,000		400,000
Maintenance Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(800,000)		6,700,000		3,400,000
Maintenance Expense [Member] | AEP Texas Inc. [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(300,000)		1,800,000		1,000,000.0
Maintenance Expense [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(100,000)		900,000		500,000
Maintenance Expense [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(100,000)		600,000		300,000
Maintenance Expense [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(100,000)		1,200,000		600,000
Maintenance Expense [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(100,000)		800,000		400,000
Maintenance Expense [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(200,000)		1,100,000		500,000
Regulatory Assets [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	(94,800,000)		52,600,000		(9,100,000)
Regulatory Assets [Member] | AEP Texas Inc. [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	(200,000)		100,000		0
Regulatory Assets [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	(21,900,000)		(100,000)		(2,700,000)
Regulatory Assets [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	(3,100,000)		(800,000)		(14,800,000)
Regulatory Assets [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	(14,000,000.0)		52,100,000		10,000,000.0
Regulatory Assets [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	(29,800,000)		3,600,000		(3,600,000)
Regulatory Assets [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	(15,500,000)		(2,100,000)		3,600,000
Regulatory Liabilities [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	169,700,000		299,700,000		156,400,000
Regulatory Liabilities [Member] | AEP Texas Inc. [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	0		(600,000)		200,000
Regulatory Liabilities [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	1,000,000.0		82,400,000		55,900,000
Regulatory Liabilities [Member] | Indiana Michigan Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	7,800,000		8,600,000		(3,900,000)
Regulatory Liabilities [Member] | Ohio Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	0		3,700,000		0
Regulatory Liabilities [Member] | Public Service Co Of Oklahoma [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	88,700,000		98,500,000		48,900,000
Regulatory Liabilities [Member] | Southwestern Electric Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	$ 70,700,000		$ 77,900,000		$ 37,000,000.0

[1] Amounts include $(30) million and $(38) million as of December 31, 2023 and 2022, respectively, for the fair value hedge adjustment of hedged debt obligations for which hedge accounting has been discontinued.

[2] Amounts included within Noncurrent Liabilities line item Long-term Debt on the Balance Sheet.

[3] Gain (Loss) is included in Interest Expense on the statements of income.

[4] The December 31, 2023 maturities of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), were as follows: Level 1 matures $(11) million in 2024 and $(4) million in 2025-2027; Level 2 matures $(99) million in 2024, $(44) million in periods 2025-2027, $7 million in periods 2028-2029 and $2 million in periods 2030-2033; Level 3 matures $74 million in 2024, $43 million in periods 2025-2027, $18 million in periods 2028-2029 and $(16) million in periods 2030-2033. Risk management commodity contracts are substantially comprised of power contracts.

[5] Amounts in “Other” column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.”

[6] The December 31, 2022 maturities of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), were as follows:  Level 1 matures $(7) million in 2023; Level 2 matures $182 million in 2023, $134 million in periods 2024-2026; $10 million in periods 2027-2028 and $1 million in periods 2029-2033; Level 3 matures $128 million in 2023, $6 million in periods 2024-2026, $6 million in periods 2027-2028 and $(5) million in periods 2029-2033.  Risk management commodity contracts are substantially comprised of power contracts.

[7] Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.