Derivatives and Hedging (Details) gal in Millions, MWh in Millions, MMBTU in Millions		3 Months Ended			12 Months Ended
		Mar. 31, 2023 USD ($) MWh MMBTU gal		Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) MMBTU MWh gal
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		$ 108,000,000			$ 481,000,000
Fair Value of Derivative Instruments
Current Risk Management Assets		190,600,000			348,800,000
Long-term Risk Management Assets		318,200,000			284,100,000
Total Assets		508,800,000			632,900,000
Current Risk Management Liabilities		166,000,000.0			145,200,000
Long-term Risk Management Liabilities		315,400,000			345,200,000
Total Liabilities		481,400,000			490,400,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(178,200,000)	[1]	$ 215,300,000
Carrying Amount of Hedged Asset (Liability)	[2],[3]	(860,800,000)			(855,500,000)
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)	[2],[3]	84,700,000			89,700,000
Gain (Loss) on Hedging Instruments
Gain (Loss) on Fair Value Hedging Instruments	[4]	6,900,000		(44,800,000)
Gain (Loss) on Fair Value Portion of Long Term Debt	[4]	(6,900,000)		44,800,000
Collateral Triggering Events [Abstract]
Fair Value Of Derivative Liabilities Subject To Cross Acceleration Provisions		121,000,000			127,000,000
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions		193,000,000			217,000,000
Derivatives and Hedging (Textuals) [Abstract]
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)		(36,000,000)			(38,000,000)
Credit Downgrade Trigger Exposure		0			2,000,000
AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Total Liabilities		800,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(400,000)	[1]	1,300,000
Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		12,400,000			69,100,000
Current Risk Management Liabilities		7,000,000.0			3,600,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(32,700,000)	[1]	100,000
Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		5,900,000			15,200,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(4,600,000)	[1]	200,000
Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Liabilities		6,000,000.0			1,800,000
Long-term Risk Management Liabilities		40,900,000			37,900,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(12,300,000)	[1]	24,100,000
Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		9,400,000			25,300,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		16,800,000	[1]	16,500,000
Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		6,300,000			16,400,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		10,400,000	[1]	19,000,000.0
Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Total Assets	[5]	363,200,000	[6]		315,400,000	[7]
Total Liabilities	[5]	305,600,000	[6]		339,800,000	[7]
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],[8]	12,400,000			69,100,000
Total Liabilities	[5],[8]	7,000,000.0			3,500,000
Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[5],[8]	7,000,000.0			15,400,000
Total Liabilities	[5],[8]	400,000			0
Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[5],[8]	0			0
Total Liabilities	[8]	46,900,000			39,700,000
Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Total Assets	[5],[8]	9,400,000			25,300,000
Total Liabilities	[5],[8]	1,100,000			1,600,000
Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[5],[8]	6,300,000			16,400,000
Total Liabilities	[5],[8]	1,100,000			1,400,000
Commodity [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		65,300,000			223,500,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		$ (2,000,000.0)			119,900,000
Derivatives and Hedging (Textuals) [Abstract]
Maximum Term for Exposure to Variability of Future Cash Flows		96 months
Cross Acceleration Provisions Maximum Third Party Obligation Amount		$ 50,000,000
Cross Default Provisions Maximum Third Party Obligation Amount		50,000,000
Commodity [Member] | Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	621,100,000			965,400,000
Long-term Risk Management Assets	[9]	494,300,000			565,600,000
Total Assets	[9]	1,115,400,000			1,531,000,000
Current Risk Management Liabilities	[9]	562,500,000			663,800,000
Long-term Risk Management Liabilities	[9]	402,600,000			412,000,000.0
Total Liabilities	[9]	965,100,000			1,075,800,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	150,300,000	[10]		455,200,000
Commodity [Member] | Risk Management Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	0			0
Long-term Risk Management Assets	[9]	0			0
Total Assets	[9]	0			0
Current Risk Management Liabilities	[9]	400,000			0
Long-term Risk Management Liabilities	[9]	0			0
Total Liabilities	[9]	400,000			0
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	(400,000)			0
Commodity [Member] | Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	12,800,000			69,300,000
Long-term Risk Management Assets	[9]	500,000			700,000
Total Assets	[9]	13,300,000			70,000,000.0
Current Risk Management Liabilities	[9]	7,600,000			4,100,000
Long-term Risk Management Liabilities	[9]	500,000			700,000
Total Liabilities	[9]	8,100,000			4,800,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	5,200,000	[10]		65,200,000
Commodity [Member] | Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	8,100,000			16,000,000.0
Long-term Risk Management Assets	[9]	5,500,000			500,000
Total Assets	[9]	13,600,000			16,500,000
Current Risk Management Liabilities	[9]	2,700,000			900,000
Long-term Risk Management Liabilities	[9]	4,400,000			300,000
Total Liabilities	[9]	7,100,000			1,200,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	6,500,000	[10]		15,300,000
Commodity [Member] | Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	0			0
Long-term Risk Management Assets	[9]	0			0
Total Assets	[9]	0			0
Current Risk Management Liabilities	[9]	6,200,000			2,100,000
Long-term Risk Management Liabilities	[9]	40,900,000			37,900,000
Total Liabilities	[9]	47,100,000			40,000,000.0
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	(47,100,000)	[10]		(40,000,000.0)
Commodity [Member] | Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	9,900,000			24,100,000
Long-term Risk Management Assets	[9]	0			0
Total Assets	[9]	9,900,000			24,100,000
Current Risk Management Liabilities	[9]	1,800,000			2,100,000
Long-term Risk Management Liabilities	[9]	0			0
Total Liabilities	[9]	1,800,000			2,100,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	8,100,000	[10]		22,000,000.0
Commodity [Member] | Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	6,400,000			16,800,000
Long-term Risk Management Assets	[9]	0			0
Total Assets	[9]	6,400,000			16,800,000
Current Risk Management Liabilities	[9]	1,400,000			2,000,000.0
Long-term Risk Management Liabilities	[9]	0			0
Total Liabilities	[9]	1,400,000			2,000,000.0
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	5,000,000.0	[10]		14,800,000
Commodity [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	85,000,000.0			212,200,000
Long-term Risk Management Assets	[9]	117,000,000.0			148,900,000
Total Assets	[9]	202,000,000.0			361,100,000
Current Risk Management Liabilities	[9]	87,500,000			60,400,000
Long-term Risk Management Liabilities	[9]	31,400,000			17,400,000
Total Liabilities	[9]	118,900,000			77,800,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	83,100,000	[10]		283,300,000
Interest Rate [Member]
Commodity:
Derivative, Notional Amount		1,700,000,000			1,650,000,000
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		6,100,000			300,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		$ 1,900,000			300,000
Derivatives and Hedging (Textuals) [Abstract]
Maximum Term for Exposure to Variability of Future Cash Flows		93 months
Interest Rate [Member] | AEP Texas Inc. [Member]
Commodity:
Derivative, Notional Amount		$ 150,000,000.0			0
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		(300,000)			(300,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months		0			(200,000)
Interest Rate [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Notional Amount		0			0
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		6,500,000			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 Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		(5,800,000)			(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 Condensed 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 Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		1,500,000			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	[9]	8,900,000			1,800,000
Long-term Risk Management Assets	[9]	0			14,300,000
Total Assets	[9]	8,900,000			16,100,000
Current Risk Management Liabilities	[9]	39,500,000			41,400,000
Long-term Risk Management Liabilities	[9]	82,700,000			91,100,000
Total Liabilities	[9]	122,200,000			132,500,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	(113,300,000)			(116,400,000)
Interest Rate [Member] | Hedging Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	500,000
Long-term Risk Management Assets	[9]	0
Total Assets	[9]	500,000
Current Risk Management Liabilities	[9]	800,000
Long-term Risk Management Liabilities	[9]	0
Total Liabilities	[9]	800,000
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	(300,000)
Interest Rate [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]				1,600,000
Long-term Risk Management Assets	[9]				0
Total Assets	[9]				1,600,000
Current Risk Management Liabilities	[9]				0
Long-term Risk Management Liabilities	[9]				0
Total Liabilities	[9]				0
Total MTM Derivative Contract Net Assets (Liabilities)	[9]				1,600,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		715,000,000.0			1,179,400,000
Long-term Risk Management Assets		611,300,000			728,800,000
Total Assets		1,326,300,000			1,908,200,000
Current Risk Management Liabilities		689,500,000			765,600,000
Long-term Risk Management Liabilities		516,700,000			520,500,000
Total Liabilities		1,206,200,000			1,286,100,000
Total MTM Derivative Contract Net Assets (Liabilities)		120,100,000	[10]		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		500,000
Long-term Risk Management Assets		0
Total Assets		500,000
Current Risk Management Liabilities		1,200,000
Long-term Risk Management Liabilities		0
Total Liabilities		1,200,000
Total MTM Derivative Contract Net Assets (Liabilities)		(700,000)
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets					25,700,000
Long-term Risk Management Assets					0
Total Assets					25,700,000
Current Risk Management Liabilities					2,100,000
Long-term Risk Management Liabilities					0
Total Liabilities					2,100,000
Total MTM Derivative Contract Net Assets (Liabilities)					23,600,000
Gross Amounts Offset in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[11]	(524,400,000)			(830,600,000)
Long-term Risk Management Assets	[11]	(293,100,000)			(444,700,000)
Total Assets	[11]	(817,500,000)			(1,275,300,000)
Current Risk Management Liabilities	[11]	(523,500,000)			(620,400,000)
Long-term Risk Management Liabilities	[11]	(201,300,000)			(175,300,000)
Total Liabilities	[11]	(724,800,000)			(795,700,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[11]	(92,700,000)	[10]		(479,600,000)
Gross Amounts Offset in the Statement of Financial Position [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[11]	0			0
Long-term Risk Management Assets	[11]	0			0
Total Assets	[11]	0			0
Current Risk Management Liabilities	[11]	(400,000)			0
Long-term Risk Management Liabilities	[11]	0			0
Total Liabilities	[11]	(400,000)			0
Total MTM Derivative Contract Net Assets (Liabilities)	[11]	400,000			0
Gross Amounts Offset in the Statement of Financial Position [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[11]	(400,000)			(200,000)
Long-term Risk Management Assets	[11]	(500,000)			(700,000)
Total Assets	[11]	(900,000)			(900,000)
Current Risk Management Liabilities	[11]	(600,000)			(500,000)
Long-term Risk Management Liabilities	[11]	(500,000)			(600,000)
Total Liabilities	[11]	(1,100,000)			(1,100,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[11]	200,000			200,000
Gross Amounts Offset in the Statement of Financial Position [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[11]	(2,200,000)			(800,000)
Long-term Risk Management Assets	[11]	(4,400,000)			(300,000)
Total Assets	[11]	(6,600,000)			(1,100,000)
Current Risk Management Liabilities	[11]	(2,300,000)			(900,000)
Long-term Risk Management Liabilities	[11]	(4,400,000)			(300,000)
Total Liabilities	[11]	(6,700,000)			(1,200,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[11]	100,000			100,000
Gross Amounts Offset in the Statement of Financial Position [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[11]	0			0
Long-term Risk Management Assets	[11]	0			0
Total Assets	[11]	0			0
Current Risk Management Liabilities	[11]	(200,000)			(300,000)
Long-term Risk Management Liabilities	[11]	0			0
Total Liabilities	[11]	(200,000)			(300,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[11]	200,000			300,000
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	[11]	(500,000)			(400,000)
Long-term Risk Management Assets	[11]	0			0
Total Assets	[11]	(500,000)			(400,000)
Current Risk Management Liabilities	[11]	(700,000)			(500,000)
Long-term Risk Management Liabilities	[11]	0			0
Total Liabilities	[11]	(700,000)			(500,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[11]	200,000			100,000
Gross Amounts Offset in the Statement of Financial Position [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[11]	(100,000)			(400,000)
Long-term Risk Management Assets	[11]	0			0
Total Assets	[11]	(100,000)			(400,000)
Current Risk Management Liabilities	[11]	(300,000)			(600,000)
Long-term Risk Management Liabilities	[11]	0			0
Total Liabilities	[11]	(300,000)			(600,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[11]	200,000			200,000
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[12]	190,600,000			348,800,000
Long-term Risk Management Assets	[12]	318,200,000			284,100,000
Total Assets	[12]	508,800,000			632,900,000
Current Risk Management Liabilities	[12]	166,000,000.0			145,200,000
Long-term Risk Management Liabilities	[12]	315,400,000			345,200,000
Total Liabilities	[12]	481,400,000			490,400,000
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	27,400,000	[10]		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	[12]	500,000			0
Long-term Risk Management Assets	[12]	0			0
Total Assets	[12]	500,000			0
Current Risk Management Liabilities	[12]	800,000			0
Long-term Risk Management Liabilities	[12]	0			0
Total Liabilities	[12]	800,000			0
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	(300,000)			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	[12]	12,400,000			69,100,000
Long-term Risk Management Assets	[12]	0			0
Total Assets	[12]	12,400,000			69,100,000
Current Risk Management Liabilities	[12]	7,000,000.0			3,600,000
Long-term Risk Management Liabilities	[12]	0			100,000
Total Liabilities	[12]	7,000,000.0			3,700,000
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	5,400,000	[10]		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	[12]	5,900,000			15,200,000
Long-term Risk Management Assets	[12]	1,100,000			200,000
Total Assets	[12]	7,000,000.0			15,400,000
Current Risk Management Liabilities	[12]	400,000			0
Long-term Risk Management Liabilities	[12]	0			0
Total Liabilities	[12]	400,000			0
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	6,600,000	[10]		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	[12]	0			0
Long-term Risk Management Assets	[12]	0			0
Total Assets	[12]	0			0
Current Risk Management Liabilities	[12]	6,000,000.0			1,800,000
Long-term Risk Management Liabilities	[12]	40,900,000			37,900,000
Total Liabilities	[12]	46,900,000			39,700,000
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	(46,900,000)	[10]		(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	[12]	9,400,000			25,300,000
Long-term Risk Management Assets	[12]	0			0
Total Assets	[12]	9,400,000			25,300,000
Current Risk Management Liabilities	[12]	1,100,000			1,600,000
Long-term Risk Management Liabilities	[12]	0			0
Total Liabilities	[12]	1,100,000			1,600,000
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	8,300,000	[10]		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	[12]	6,300,000			16,400,000
Long-term Risk Management Assets	[12]	0			0
Total Assets	[12]	6,300,000			16,400,000
Current Risk Management Liabilities	[12]	1,100,000			1,400,000
Long-term Risk Management Liabilities	[12]	0			0
Total Liabilities	[12]	1,100,000			1,400,000
Total MTM Derivative Contract Net Assets (Liabilities)	[12]	$ 5,200,000	[10]		$ 15,000,000.0
Power [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		213.5			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		7.3			17.9
Power [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		4.1			4.2
Power [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		2.4			2.5
Power [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		1.8			2.9
Power [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		1.3			2.2
Natural Gas [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		92.8			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		2.9			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		3.1			1.9
Natural Gas [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		1.8			2.1
Heating Oil and Gasoline [Member]
Commodity:
Derivative, Volume Notional Amount | gal		5.0			6.9
Heating Oil and Gasoline [Member] | AEP Texas Inc. [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1.4			1.9
Heating Oil and Gasoline [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		0.8			1.0
Heating Oil and Gasoline [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		0.5			0.7
Heating Oil and Gasoline [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1.0			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		0.7			1.0
Interest Rate Contract [Member]
Commodity:
Derivative, Notional Amount		$ 91,400,000			$ 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		(5,300,000)
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
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
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
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
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
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
Generation and Marketing Revenues [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(147,400,000)		152,300,000
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
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
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
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
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
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
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
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
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		0		100,000
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		(5,300,000)		(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
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
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
Purchased Electricity for Resale [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		700,000		1,500,000
Purchased Electricity for Resale [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
Purchased Electricity for Resale [Member] | Appalachian Power Co [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		600,000		1,400,000
Purchased Electricity for Resale [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
Purchased Electricity for Resale [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
Purchased Electricity for Resale [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
Purchased Electricity for Resale [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
Other Operation Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts				600,000
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				200,000
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
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				100,000
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				100,000
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				100,000
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				100,000
Maintenance Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		100,000		800,000
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		0		200,000
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		0		100,000
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		0		100,000
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		0		100,000
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		0		100,000
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		0		100,000
Regulatory Assets [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(24,800,000)	[13]	23,600,000
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		(400,000)	[13]	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		(7,100,000)	[13]	(100,000)
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		(500,000)	[13]	(1,600,000)
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		(12,300,000)	[13]	23,900,000
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		(1,200,000)	[13]	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		(1,500,000)	[13]	(2,100,000)
Regulatory Liabilities [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(1,500,000)	[13]	36,500,000
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		0	[13]	900,000
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		(26,200,000)	[13]	(1,400,000)
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		1,200,000	[13]	1,700,000
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		0	[13]	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		18,000,000.0	[13]	12,700,000
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		$ 11,900,000	[13]	$ 20,900,000

[1] Decrease in amounts as of March 31, 2023 are primarily due to decreases in commodity prices for power and natural gas and a decrease in value of FTRs.

[2] Amounts include $(36) million and $(38) million as of March 31, 2023 and December 31, 2022, respectively, for the fair value hedge adjustment of hedged debt obligations for which hedge accounting has been discontinued.

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

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

[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 March 31, 2023 maturities of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), were as follows: Level 1 matures $(14) million in 2023 and $(6) million in periods 2024-2026; Level 2 matures $24 million in 2023, $105 million in periods 2024-2026, $9 million in periods 2027-2028 and $1 million in periods 2029-2033; Level 3 matures $18 million in 2023, $9 million in periods 2024-2026, $11 million in periods 2027-2028 and $(7) million in periods 2029-2033.  Risk management commodity contracts are substantially comprised of power contracts.

[7] 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.

[8] Substantially comprised of power contracts for the Registrant Subsidiaries.

[9] Derivative instruments within these categories are disclosed as gross.  These instruments are subject to master netting agreements and are presented on the balance sheets on a net basis in accordance with the accounting guidance for “Derivatives and Hedging.”

[10] Decrease in amounts as of March 31, 2023 are primarily due to decreases in commodity prices for power and natural gas and a decrease in value of FTRs.

[11] Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for “Derivatives and Hedging.”

[12] All derivative contracts subject to a master netting arrangement or similar agreement are offset in the statement of financial position.

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