Derivatives and Hedging (Details) gal in Millions, MWh in Millions, MMBTU in Millions		3 Months Ended			6 Months Ended			12 Months Ended
		Jun. 30, 2023 USD ($) MMBTU MWh gal		Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) MMBTU MWh gal		Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) MWh MMBTU gal
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		$ 73,000,000			$ 73,000,000			$ 481,000,000
Cash Collateral Paid Netted Against Risk Management Liabilities		35,000,000			35,000,000			2,000,000
Fair Value of Derivative Instruments
Current Risk Management Assets		279,500,000			279,500,000			348,800,000
Long-term Risk Management Assets		266,800,000			266,800,000			284,100,000
Total Assets		546,300,000			546,300,000			632,900,000
Current Risk Management Liabilities		176,200,000			176,200,000			145,200,000
Long-term Risk Management Liabilities		275,300,000			275,300,000			345,200,000
Total Liabilities		451,500,000			451,500,000			490,400,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(34,300,000)		$ 257,900,000	(212,500,000)		$ 473,200,000
Carrying Amount of Hedged Asset (Liability)	[1],[2]	(855,100,000)			(855,100,000)			(855,500,000)
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)	[1],[2]	90,800,000			90,800,000			89,700,000
Gain (Loss) on Hedging Instruments
Gain (Loss) on Fair Value Hedging Instruments	[3]	(4,200,000)		(17,600,000)	2,700,000		(62,400,000)
Gain (Loss) on Fair Value Portion of Long Term Debt	[3]	4,200,000		17,600,000	(2,700,000)		62,400,000
Collateral Triggering Events [Abstract]
Fair Value Of Derivative Liabilities Subject To Cross Acceleration Provisions		125,000,000			125,000,000			127,000,000
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions		178,000,000			178,000,000			217,000,000
Derivatives and Hedging (Textuals) [Abstract]
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)		(34,000,000)			(34,000,000)			(38,000,000)
Credit Downgrade Trigger Exposure		0			0			2,000,000
AEP Texas Inc. [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(200,000)		1,300,000	(600,000)		2,600,000
Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		39,200,000			39,200,000			69,100,000
Current Risk Management Liabilities		1,100,000			1,100,000			3,600,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		24,600,000		23,000,000.0	(8,100,000)		23,100,000
Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		21,400,000			21,400,000			15,200,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		19,100,000		2,200,000	14,500,000		2,400,000
Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Liabilities		6,300,000			6,300,000			1,800,000
Long-term Risk Management Liabilities		47,700,000			47,700,000			37,900,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(12,800,000)		23,300,000	(25,100,000)		47,400,000
Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		44,800,000			44,800,000			25,300,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		40,100,000		39,600,000	56,900,000		56,100,000
Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		28,000,000.0			28,000,000.0			16,400,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		32,700,000		37,500,000	43,100,000		56,500,000
Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Total Assets	[4]	425,700,000	[5]		425,700,000	[5]		315,400,000	[6]
Total Liabilities	[4]	325,200,000	[5]		325,200,000	[5]		339,800,000	[6]
Risk Management Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Total Liabilities	[4]	0			0
Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[4],[7]	39,400,000			39,400,000			69,100,000
Total Liabilities	[4],[7]	1,100,000			1,100,000			3,500,000
Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[4],[7]	30,500,000			30,500,000			15,400,000
Total Liabilities	[4],[7]	1,400,000			1,400,000			0
Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Total Liabilities	[7]	54,000,000.0			54,000,000.0			39,700,000
Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Total Assets	[4],[7]	44,800,000			44,800,000			25,300,000
Total Liabilities	[4],[7]	3,400,000			3,400,000			1,600,000
Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[4],[7]	28,000,000.0			28,000,000.0			16,400,000
Total Liabilities	[4],[7]	1,800,000			1,800,000			1,400,000
Commodity [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		93,500,000			93,500,000			223,500,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					$ 24,100,000			119,900,000
Derivatives and Hedging (Textuals) [Abstract]
Maximum Term for Exposure to Variability of Future Cash Flows					93 months
Cross Acceleration Provisions Maximum Third Party Obligation Amount		50,000,000			$ 50,000,000
Cross Default Provisions Maximum Third Party Obligation Amount		50,000,000			50,000,000
Commodity [Member] | Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[8]	721,600,000			721,600,000			965,400,000
Long-term Risk Management Assets	[8]	466,400,000			466,400,000			565,600,000
Total Assets	[8]	1,188,000,000			1,188,000,000			1,531,000,000
Current Risk Management Liabilities	[8]	631,500,000			631,500,000			663,800,000
Long-term Risk Management Liabilities	[8]	418,500,000			418,500,000			412,000,000.0
Total Liabilities	[8]	1,050,000,000			1,050,000,000			1,075,800,000
Total MTM Derivative Contract Net Assets (Liabilities)	[8]	138,000,000.0			138,000,000.0			455,200,000
Commodity [Member] | Risk Management Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[8]	0			0			0
Long-term Risk Management Assets	[8]	0			0			0
Total Assets	[8]	0			0			0
Current Risk Management Liabilities	[8]	400,000			400,000			0
Long-term Risk Management Liabilities	[8]	100,000			100,000			0
Total Liabilities	[8]	500,000			500,000			0
Total MTM Derivative Contract Net Assets (Liabilities)	[8]	(500,000)			(500,000)			0
Commodity [Member] | Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[8]	42,500,000			42,500,000			69,300,000
Long-term Risk Management Assets	[8]	600,000			600,000			700,000
Total Assets	[8]	43,100,000			43,100,000			70,000,000.0
Current Risk Management Liabilities	[8]	5,100,000			5,100,000			4,100,000
Long-term Risk Management Liabilities	[8]	400,000			400,000			700,000
Total Liabilities	[8]	5,500,000			5,500,000			4,800,000
Total MTM Derivative Contract Net Assets (Liabilities)	[8]	37,600,000			37,600,000			65,200,000
Commodity [Member] | Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[8]	22,300,000			22,300,000			16,000,000.0
Long-term Risk Management Assets	[8]	11,800,000			11,800,000			500,000
Total Assets	[8]	34,100,000			34,100,000			16,500,000
Current Risk Management Liabilities	[8]	2,800,000			2,800,000			900,000
Long-term Risk Management Liabilities	[8]	2,700,000			2,700,000			300,000
Total Liabilities	[8]	5,500,000			5,500,000			1,200,000
Total MTM Derivative Contract Net Assets (Liabilities)	[8]	28,600,000			28,600,000			15,300,000
Commodity [Member] | Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[8]	0			0			0
Long-term Risk Management Assets	[8]	0			0			0
Total Assets	[8]	0			0			0
Current Risk Management Liabilities	[8]	6,600,000			6,600,000			2,100,000
Long-term Risk Management Liabilities	[8]	47,800,000			47,800,000			37,900,000
Total Liabilities	[8]	54,400,000			54,400,000			40,000,000.0
Total MTM Derivative Contract Net Assets (Liabilities)	[8]	(54,400,000)			(54,400,000)			(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	[8]	47,400,000			47,400,000			24,100,000
Long-term Risk Management Assets	[8]	200,000			200,000			0
Total Assets	[8]	47,600,000			47,600,000			24,100,000
Current Risk Management Liabilities	[8]	5,400,000			5,400,000			2,100,000
Long-term Risk Management Liabilities	[8]	1,000,000.0			1,000,000.0			0
Total Liabilities	[8]	6,400,000			6,400,000			2,100,000
Total MTM Derivative Contract Net Assets (Liabilities)	[8]	41,200,000			41,200,000			22,000,000.0
Commodity [Member] | Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[8]	28,500,000			28,500,000			16,800,000
Long-term Risk Management Assets	[8]	0			0			0
Total Assets	[8]	28,500,000			28,500,000			16,800,000
Current Risk Management Liabilities	[8]	2,400,000			2,400,000			2,000,000.0
Long-term Risk Management Liabilities	[8]	200,000			200,000			0
Total Liabilities	[8]	2,600,000			2,600,000			2,000,000.0
Total MTM Derivative Contract Net Assets (Liabilities)	[8]	25,900,000			25,900,000			14,800,000
Commodity [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[8]	43,400,000			43,400,000			212,200,000
Long-term Risk Management Assets	[8]	95,100,000			95,100,000			148,900,000
Total Assets	[8]	138,500,000			138,500,000			361,100,000
Current Risk Management Liabilities	[8]	12,800,000			12,800,000			60,400,000
Long-term Risk Management Liabilities	[8]	6,700,000			6,700,000			17,400,000
Total Liabilities	[8]	19,500,000			19,500,000			77,800,000
Total MTM Derivative Contract Net Assets (Liabilities)	[8]	119,000,000.0			119,000,000.0			283,300,000
Interest Rate [Member]
Commodity:
Derivative, Notional Amount		950,000,000.0			950,000,000.0			1,650,000,000
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		12,700,000			12,700,000			300,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					$ 4,300,000			300,000
Derivatives and Hedging (Textuals) [Abstract]
Maximum Term for Exposure to Variability of Future Cash Flows					90 months
Interest Rate [Member] | AEP Texas Inc. [Member]
Commodity:
Derivative, Notional Amount		0			$ 0			0
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		2,900,000			2,900,000			(300,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					300,000			(200,000)
Interest Rate [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Notional Amount		0			0			0
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		6,300,000			6,300,000			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			0
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		(5,700,000)			(5,700,000)			(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			0
Interest Rate [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Notional Amount		0			0			200,000,000.0
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		(200,000)			(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			0
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		1,400,000			1,400,000			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	[8]	0			0			1,800,000
Long-term Risk Management Assets	[8]	0			0			14,300,000
Total Assets	[8]	0			0			16,100,000
Current Risk Management Liabilities	[8]	42,600,000			42,600,000			41,400,000
Long-term Risk Management Liabilities	[8]	82,100,000			82,100,000			91,100,000
Total Liabilities	[8]	124,700,000			124,700,000			132,500,000
Total MTM Derivative Contract Net Assets (Liabilities)	[8]	(124,700,000)			(124,700,000)			(116,400,000)
Interest Rate [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[8]							1,600,000
Long-term Risk Management Assets	[8]							0
Total Assets	[8]							1,600,000
Current Risk Management Liabilities	[8]							0
Long-term Risk Management Liabilities	[8]							0
Total Liabilities	[8]							0
Total MTM Derivative Contract Net Assets (Liabilities)	[8]							1,600,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		765,000,000.0			765,000,000.0			1,179,400,000
Long-term Risk Management Assets		561,500,000			561,500,000			728,800,000
Total Assets		1,326,500,000			1,326,500,000			1,908,200,000
Current Risk Management Liabilities		686,900,000			686,900,000			765,600,000
Long-term Risk Management Liabilities		507,300,000			507,300,000			520,500,000
Total Liabilities		1,194,200,000			1,194,200,000			1,286,100,000
Total MTM Derivative Contract Net Assets (Liabilities)		132,300,000			132,300,000			622,100,000
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	[9]	(485,500,000)			(485,500,000)			(830,600,000)
Long-term Risk Management Assets	[9]	(294,700,000)			(294,700,000)			(444,700,000)
Total Assets	[9]	(780,200,000)			(780,200,000)			(1,275,300,000)
Current Risk Management Liabilities	[9]	(510,700,000)			(510,700,000)			(620,400,000)
Long-term Risk Management Liabilities	[9]	(232,000,000.0)			(232,000,000.0)			(175,300,000)
Total Liabilities	[9]	(742,700,000)			(742,700,000)			(795,700,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	(37,500,000)			(37,500,000)			(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	[9]	0			0			0
Long-term Risk Management Assets	[9]	0			0			0
Total Assets	[9]	0			0			0
Current Risk Management Liabilities	[9]	(400,000)			(400,000)			0
Long-term Risk Management Liabilities	[9]	(100,000)			(100,000)			0
Total Liabilities	[9]	(500,000)			(500,000)			0
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	500,000			500,000			0
Gross Amounts Offset in the Statement of Financial Position [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[9]	(3,300,000)			(3,300,000)			(200,000)
Long-term Risk Management Assets	[9]	(400,000)			(400,000)			(700,000)
Total Assets	[9]	(3,700,000)			(3,700,000)			(900,000)
Current Risk Management Liabilities	[9]	(4,000,000.0)			(4,000,000.0)			(500,000)
Long-term Risk Management Liabilities	[9]	(400,000)			(400,000)			(600,000)
Total Liabilities	[9]	(4,400,000)			(4,400,000)			(1,100,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	700,000			700,000			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	[9]	(900,000)			(900,000)			(800,000)
Long-term Risk Management Assets	[9]	(2,700,000)			(2,700,000)			(300,000)
Total Assets	[9]	(3,600,000)			(3,600,000)			(1,100,000)
Current Risk Management Liabilities	[9]	(1,400,000)			(1,400,000)			(900,000)
Long-term Risk Management Liabilities	[9]	(2,700,000)			(2,700,000)			(300,000)
Total Liabilities	[9]	(4,100,000)			(4,100,000)			(1,200,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	500,000			500,000			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	[9]	0			0			0
Long-term Risk Management Assets	[9]	0			0			0
Total Assets	[9]	0			0			0
Current Risk Management Liabilities	[9]	(300,000)			(300,000)			(300,000)
Long-term Risk Management Liabilities	[9]	(100,000)			(100,000)			0
Total Liabilities	[9]	(400,000)			(400,000)			(300,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	400,000			400,000			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	[9]	(2,600,000)			(2,600,000)			(400,000)
Long-term Risk Management Assets	[9]	(200,000)			(200,000)			0
Total Assets	[9]	(2,800,000)			(2,800,000)			(400,000)
Current Risk Management Liabilities	[9]	(2,800,000)			(2,800,000)			(500,000)
Long-term Risk Management Liabilities	[9]	(200,000)			(200,000)			0
Total Liabilities	[9]	(3,000,000.0)			(3,000,000.0)			(500,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	200,000			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	[9]	(500,000)			(500,000)			(400,000)
Long-term Risk Management Assets	[9]	0			0			0
Total Assets	[9]	(500,000)			(500,000)			(400,000)
Current Risk Management Liabilities	[9]	(800,000)			(800,000)			(600,000)
Long-term Risk Management Liabilities	[9]	0			0			0
Total Liabilities	[9]	(800,000)			(800,000)			(600,000)
Total MTM Derivative Contract Net Assets (Liabilities)	[9]	300,000			300,000			200,000
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets	[10]	279,500,000			279,500,000			348,800,000
Long-term Risk Management Assets	[10]	266,800,000			266,800,000			284,100,000
Total Assets	[10]	546,300,000			546,300,000			632,900,000
Current Risk Management Liabilities	[10]	176,200,000			176,200,000			145,200,000
Long-term Risk Management Liabilities	[10]	275,300,000			275,300,000			345,200,000
Total Liabilities	[10]	451,500,000			451,500,000			490,400,000
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	94,800,000			94,800,000			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	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	0			0			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	0			0			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	0			0			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	[10]	39,200,000			39,200,000			69,100,000
Long-term Risk Management Assets	[10]	200,000			200,000			0
Total Assets	[10]	39,400,000			39,400,000			69,100,000
Current Risk Management Liabilities	[10]	1,100,000			1,100,000			3,600,000
Long-term Risk Management Liabilities	[10]	0			0			100,000
Total Liabilities	[10]	1,100,000			1,100,000			3,700,000
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	38,300,000			38,300,000			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	[10]	21,400,000			21,400,000			15,200,000
Long-term Risk Management Assets	[10]	9,100,000			9,100,000			200,000
Total Assets	[10]	30,500,000			30,500,000			15,400,000
Current Risk Management Liabilities	[10]	1,400,000			1,400,000			0
Long-term Risk Management Liabilities	[10]	0			0			0
Total Liabilities	[10]	1,400,000			1,400,000			0
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	29,100,000			29,100,000			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	[10]	0			0			0
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	0			0			0
Current Risk Management Liabilities	[10]	6,300,000			6,300,000			1,800,000
Long-term Risk Management Liabilities	[10]	47,700,000			47,700,000			37,900,000
Total Liabilities	[10]	54,000,000.0			54,000,000.0			39,700,000
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	(54,000,000.0)			(54,000,000.0)			(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	[10]	44,800,000			44,800,000			25,300,000
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	44,800,000			44,800,000			25,300,000
Current Risk Management Liabilities	[10]	2,600,000			2,600,000			1,600,000
Long-term Risk Management Liabilities	[10]	800,000			800,000			0
Total Liabilities	[10]	3,400,000			3,400,000			1,600,000
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	41,400,000			41,400,000			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	[10]	28,000,000.0			28,000,000.0			16,400,000
Long-term Risk Management Assets	[10]	0			0			0
Total Assets	[10]	28,000,000.0			28,000,000.0			16,400,000
Current Risk Management Liabilities	[10]	1,600,000			1,600,000			1,400,000
Long-term Risk Management Liabilities	[10]	200,000			200,000			0
Total Liabilities	[10]	1,800,000			1,800,000			1,400,000
Total MTM Derivative Contract Net Assets (Liabilities)	[10]	$ 26,200,000			$ 26,200,000			$ 15,000,000.0
Power [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		269.9			269.9			226.8
Power [Member] | AEP Texas Inc. [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		0.0			0.0			0.0
Power [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		29.1			29.1			17.9
Power [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		9.2			9.2			4.2
Power [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		2.3			2.3			2.5
Power [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		8.7			8.7			2.9
Power [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		6.9			6.9			2.2
Natural Gas [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		136.8			136.8			77.1
Natural Gas [Member] | AEP Texas Inc. [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		0.0			0.0			0.0
Natural Gas [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		5.2			5.2			1.9
Natural Gas [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		0.0			0.0			0.0
Natural Gas [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		0.0			0.0			0.0
Natural Gas [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		28.3			28.3			1.9
Natural Gas [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		7.3			7.3			2.1
Heating Oil and Gasoline [Member]
Commodity:
Derivative, Volume Notional Amount | gal		6.7			6.7			6.9
Heating Oil and Gasoline [Member] | AEP Texas Inc. [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1.8			1.8			1.9
Heating Oil and Gasoline [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1.0			1.0			1.0
Heating Oil and Gasoline [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		0.6			0.6			0.7
Heating Oil and Gasoline [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1.4			1.4			1.4
Heating Oil and Gasoline [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Volume Notional Amount | gal		0.9			0.9			0.9
Heating Oil and Gasoline [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		0.9			0.9			1.0
Interest Rate Contract [Member]
Commodity:
Derivative, Notional Amount		$ 91,400,000			$ 91,400,000			$ 99,900,000
Interest Rate Contract [Member] | AEP Texas Inc. [Member]
Commodity:
Derivative, Notional Amount		0			0			0
Interest Rate Contract [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Notional Amount		0			0			0
Interest Rate Contract [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Notional Amount		0			0			0
Interest Rate Contract [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Notional Amount		0			0			0
Interest Rate Contract [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Notional Amount		0			0			0
Interest Rate Contract [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Notional Amount		0			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		17,000,000.0		100,000	11,700,000		100,000
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		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		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		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		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		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		0
Generation and Marketing Revenues [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(141,800,000)		121,000,000.0	(289,200,000)		273,300,000
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	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		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		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		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		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		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		0			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		17,000,000.0			11,700,000		(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		1,300,000		900,000	2,000,000.0		2,400,000
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		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		1,300,000		700,000	1,900,000		2,100,000
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		0	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		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		100,000	0		100,000
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		0
Other Operation Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(100,000)		1,700,000	(100,000)		2,300,000
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		0		500,000	0		700,000
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		200,000	0		200,000
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		200,000	0		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		300,000	0		400,000
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		200,000	0		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		300,000	0		400,000
Maintenance Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(300,000)		2,400,000	(200,000)		3,200,000
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		(100,000)		700,000	(100,000)		900,000
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		400,000	0		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		0		200,000	0		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		0		400,000	0		500,000
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		300,000	0		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		0		400,000	0		500,000
Regulatory Assets [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[11]	(12,400,000)		21,400,000	(37,200,000)		45,000,000.0
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	[11]	(100,000)		100,000	(500,000)		100,000
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	[11]	5,900,000		100,000	(1,200,000)		0
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	[11]	(1,600,000)		300,000	(2,100,000)		(1,300,000)
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	[11]	(12,800,000)		21,000,000.0	(25,100,000)		44,900,000
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	[11]	(2,300,000)		0	(3,500,000)		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	[11]	(900,000)		(100,000)	(2,400,000)		(2,200,000)
Regulatory Liabilities [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[11]	102,000,000.0		110,400,000	100,500,000		146,900,000
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	[11]	0		0	0		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	[11]	17,400,000		21,600,000	(8,800,000)		20,200,000
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	[11]	3,600,000		1,500,000	4,800,000		3,200,000
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	[11]	0		1,600,000	0		1,600,000
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	[11]	42,400,000		39,000,000.0	60,400,000		51,700,000
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]	$ 33,600,000		$ 36,900,000	$ 45,500,000		$ 57,800,000

[1] Amounts include $(34) million and $(38) million as of June 30, 2023 and December 31, 2022, respectively, for the fair value hedge adjustment of hedged debt obligations for which hedge accounting has been discontinued.

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

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

[4] 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.’’

[5] The June 30, 2023 maturities of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), were as follows: Level 1 matures $(6) million in 2023 and $(8) million in periods 2024-2026; Level 2 matures $(27) million in 2023, $59 million in periods 2024-2026, $12 million in periods 2027-2028 and $2 million in periods 2029-2033; Level 3 matures $63 million in 2023, $56 million in periods 2024-2026, $1 million in periods 2027-2028 and $(14) million in periods 2029-2033.  Risk management commodity contracts are substantially comprised of power contracts.

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

[8] 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.”

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

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

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