Derivatives and Hedging (Details) gal in Millions, MWh in Millions, MMBTU in Millions		3 Months Ended			6 Months Ended			12 Months Ended
		Jun. 30, 2024 USD ($) MWh MMBTU gal		Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) MWh MMBTU gal		Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) MWh MMBTU gal
Cash Collateral Netting
Cash Collateral Received Netted Against Risk Management Assets		$ 155,000,000			$ 155,000,000			$ 46,000,000
Fair Value of Derivative Instruments
Current Risk Management Assets		322,700,000			322,700,000			217,500,000
Long-term Risk Management Assets		255,400,000			255,400,000			321,200,000
Total Assets		578,100,000			578,100,000			538,700,000
Current Risk Management Liabilities		155,000,000.0			155,000,000.0			229,600,000
Long-term Risk Management Liabilities		261,400,000			261,400,000			241,800,000
Total Liabilities		416,400,000			416,400,000			471,400,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		77,000,000.0		$ (34,300,000)	73,900,000		$ (212,500,000)
Carrying Amount of Hedged Asset (Liability)	[1],[2]	(876,800,000)			(876,800,000)			(878,200,000)
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of the Hedged Asset (Liability)	[1],[2]	70,400,000			70,400,000			68,400,000
Gain (Loss) on Hedging Instruments
Gain (Loss) on Fair Value Hedging Instruments	[3]	18,200,000		(4,200,000)	1,800,000		2,700,000
Gain (Loss) on Fair Value Portion of Long Term Debt	[3]	(18,200,000)		4,200,000	(1,800,000)		(2,700,000)
Collateral Triggering Events [Abstract]
Fair Value Of Derivative Liabilities Subject To Cross Acceleration Provisions		97,000,000			97,000,000			107,000,000
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions		233,000,000			233,000,000			242,000,000
Derivatives and Hedging (Textuals) [Abstract]
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)		(26,000,000)			(26,000,000)			(30,000,000)
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		100,000		(200,000)	500,000		(600,000)
Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		67,700,000			67,700,000			22,400,000
Current Risk Management Liabilities		9,000,000.0			9,000,000.0			15,900,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		28,600,000		24,600,000	42,600,000		(8,100,000)
Collateral Triggering Events [Abstract]
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions		13,000,000			13,000,000			22,000,000
Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		28,100,000			28,100,000			27,800,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		16,300,000		19,100,000	(8,900,000)		14,500,000
Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Liabilities		6,000,000.0			6,000,000.0			6,800,000
Long-term Risk Management Liabilities		37,200,000			37,200,000			43,900,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		(3,000,000.0)		(12,800,000)	5,600,000		(25,100,000)
Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		49,400,000			49,400,000			19,000,000.0
Current Risk Management Liabilities		19,100,000			19,100,000			28,900,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		42,700,000		40,100,000	59,800,000		56,900,000
Collateral Triggering Events [Abstract]
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions		23,000,000			23,000,000			29,000,000
Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		38,200,000			38,200,000			11,600,000
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		34,900,000		32,700,000	54,800,000		43,100,000
Collateral Triggering Events [Abstract]
Fair Value Of Derivative Liabilities Subject To Cross Default Provisions		10,000,000			10,000,000			15,000,000
Risk Management Contracts [Member]
Fair Value of Derivative Instruments
Total Assets	[5]	435,200,000	[4]		435,200,000	[4]		403,900,000	[6]
Total Liabilities	[5]	318,700,000	[4]		318,700,000	[4]		362,300,000	[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]	67,700,000			67,700,000			22,400,000
Total Liabilities	[5]	13,300,000			13,300,000			22,500,000
Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[5]	28,100,000			28,100,000			39,600,000
Total Liabilities	[5]	0			0			2,000,000.0
Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Total Liabilities		43,200,000	[5]		43,200,000	[5]		50,700,000
Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Total Assets	[5]	49,400,000			49,400,000			19,000,000.0
Total Liabilities	[5]	22,800,000			22,800,000			29,900,000
Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Total Assets	[5]	38,200,000			38,200,000			11,600,000
Total Liabilities	[5]	11,100,000			11,100,000			15,600,000
Commodity [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		103,700,000			103,700,000			104,900,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					$ 35,500,000			38,300,000
Derivatives and Hedging (Textuals) [Abstract]
Maximum Term for Exposure to Variability of Future Cash Flows					81 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] | AEP Texas Inc. [Member]
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		0			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 Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		0			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 Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		0			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 Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		0			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 Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		0			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		590,600,000			590,600,000			555,100,000
Long-term Risk Management Assets		549,600,000			549,600,000			468,800,000
Current Risk Management Liabilities		403,000,000.0			403,000,000.0			588,000,000.0
Long-term Risk Management Liabilities		468,100,000			468,100,000			377,600,000
Commodity [Member] | Risk Management Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			200,000
Long-term Risk Management Liabilities		0			0			0
Commodity [Member] | Risk Management Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		72,800,000			72,800,000			24,600,000
Long-term Risk Management Assets		800,000			800,000			300,000
Current Risk Management Liabilities		15,500,000			15,500,000			18,500,000
Long-term Risk Management Liabilities		5,100,000			5,100,000			6,900,000
Commodity [Member] | Risk Management Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		34,800,000			34,800,000			30,100,000
Long-term Risk Management Assets		0			0			12,000,000.0
Current Risk Management Liabilities		6,700,000			6,700,000			5,400,000
Long-term Risk Management Liabilities		0			0			200,000
Commodity [Member] | Risk Management Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		6,000,000.0			6,000,000.0			6,900,000
Long-term Risk Management Liabilities		37,200,000			37,200,000			43,900,000
Commodity [Member] | Risk Management Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		49,800,000			49,800,000			19,700,000
Long-term Risk Management Assets		900,000			900,000			0
Current Risk Management Liabilities		19,500,000			19,500,000			29,700,000
Long-term Risk Management Liabilities		4,600,000			4,600,000			1,000,000.0
Commodity [Member] | Risk Management Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		38,600,000			38,600,000			12,000,000.0
Long-term Risk Management Assets		0			0			500,000
Current Risk Management Liabilities		9,800,000			9,800,000			14,900,000
Long-term Risk Management Liabilities		1,700,000			1,700,000			1,700,000
Commodity [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		48,600,000			48,600,000			56,700,000
Long-term Risk Management Assets		86,900,000			86,900,000			86,800,000
Current Risk Management Liabilities		3,600,000			3,600,000			8,200,000
Long-term Risk Management Liabilities		300,000			300,000			2,200,000
Commodity [Member] | Hedging Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Commodity [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Commodity [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Commodity [Member] | Hedging Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Commodity [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Commodity [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Interest Rate [Member]
Commodity:
Derivative, Notional Amount		1,350,000,000			1,350,000,000			1,300,000,000
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		9,300,000			9,300,000			(8,100,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					4,300,000			3,200,000
Interest Rate [Member] | AEP Texas Inc. [Member]
Commodity:
Derivative, Notional Amount		0			0			150,000,000.0
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		6,600,000			6,600,000			500,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					700,000			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		5,500,000			5,500,000			5,900,000
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		(5,300,000)			(5,300,000)			(5,500,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					(400,000)			(400,000)
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			0
Impact of Cash Flow Hedges on the Condensed Balance Sheet
AOCI Gain (Loss) Net of Tax		(200,000)			(200,000)			(200,000)
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					0			0
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		1,200,000			1,200,000			1,300,000
Portion Expected to be Reclassified to Net Income During the Next Twelve Months					300,000			300,000
Interest Rate [Member] | Hedging Contracts [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		10,300,000			10,300,000			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		43,300,000			43,300,000			50,500,000
Long-term Risk Management Liabilities		53,400,000			53,400,000			56,900,000
Interest Rate [Member] | Hedging Contracts [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			2,700,000
Long-term Risk Management Liabilities		0			0			0
Interest Rate [Member] | Hedging Contracts [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Interest Rate [Member] | Hedging Contracts [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Interest Rate [Member] | Hedging Contracts [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Interest Rate [Member] | Hedging Contracts [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Interest Rate [Member] | Hedging Contracts [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			0
Long-term Risk Management Liabilities		0			0			0
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		649,500,000			649,500,000			611,800,000
Long-term Risk Management Assets		636,500,000			636,500,000			555,600,000
Total Assets		1,286,000,000			1,286,000,000			1,167,400,000
Current Risk Management Liabilities		449,900,000			449,900,000			646,700,000
Long-term Risk Management Liabilities		521,800,000			521,800,000			436,700,000
Total Liabilities		971,700,000			971,700,000			1,083,400,000
Total MTM Derivative Contract Net Assets (Liabilities)		314,300,000			314,300,000			84,000,000.0
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | AEP Texas Inc. [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Total Assets		0			0			0
Current Risk Management Liabilities		0			0			2,900,000
Long-term Risk Management Liabilities		0			0			0
Total Liabilities		0			0			2,900,000
Total MTM Derivative Contract Net Assets (Liabilities)		0			0			(2,900,000)
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Appalachian Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		72,800,000			72,800,000			24,600,000
Long-term Risk Management Assets		800,000			800,000			300,000
Total Assets		73,600,000			73,600,000			24,900,000
Current Risk Management Liabilities		15,500,000			15,500,000			18,500,000
Long-term Risk Management Liabilities		5,100,000			5,100,000			6,900,000
Total Liabilities		20,600,000			20,600,000			25,400,000
Total MTM Derivative Contract Net Assets (Liabilities)		53,000,000.0			53,000,000.0			(500,000)
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		34,800,000			34,800,000			30,100,000
Long-term Risk Management Assets		0			0			12,000,000.0
Total Assets		34,800,000			34,800,000			42,100,000
Current Risk Management Liabilities		6,700,000			6,700,000			5,400,000
Long-term Risk Management Liabilities		0			0			200,000
Total Liabilities		6,700,000			6,700,000			5,600,000
Total MTM Derivative Contract Net Assets (Liabilities)		28,100,000			28,100,000			36,500,000
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Ohio Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		0			0			0
Long-term Risk Management Assets		0			0			0
Total Assets		0			0			0
Current Risk Management Liabilities		6,000,000.0			6,000,000.0			6,900,000
Long-term Risk Management Liabilities		37,200,000			37,200,000			43,900,000
Total Liabilities		43,200,000			43,200,000			50,800,000
Total MTM Derivative Contract Net Assets (Liabilities)		(43,200,000)			(43,200,000)			(50,800,000)
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Public Service Co Of Oklahoma [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		49,800,000			49,800,000			19,700,000
Long-term Risk Management Assets		900,000			900,000			0
Total Assets		50,700,000			50,700,000			19,700,000
Current Risk Management Liabilities		19,500,000			19,500,000			29,700,000
Long-term Risk Management Liabilities		4,600,000			4,600,000			1,000,000.0
Total Liabilities		24,100,000			24,100,000			30,700,000
Total MTM Derivative Contract Net Assets (Liabilities)		26,600,000			26,600,000			(11,000,000.0)
Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] | Southwestern Electric Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		38,600,000			38,600,000			12,000,000.0
Long-term Risk Management Assets		0			0			500,000
Total Assets		38,600,000			38,600,000			12,500,000
Current Risk Management Liabilities		9,800,000			9,800,000			14,900,000
Long-term Risk Management Liabilities		1,700,000			1,700,000			1,700,000
Total Liabilities		11,500,000			11,500,000			16,600,000
Total MTM Derivative Contract Net Assets (Liabilities)		27,100,000			27,100,000			(4,100,000)
Gross Amounts Offset in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		(326,800,000)			(326,800,000)			(394,300,000)
Long-term Risk Management Assets		(381,100,000)			(381,100,000)			(234,400,000)
Current Risk Management Liabilities		(294,900,000)			(294,900,000)			(417,100,000)
Long-term Risk Management Liabilities		(260,400,000)			(260,400,000)			(194,900,000)
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			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			(200,000)
Long-term Risk Management Liabilities		0			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		(5,100,000)			(5,100,000)			(2,200,000)
Long-term Risk Management Assets		(800,000)			(800,000)			(300,000)
Current Risk Management Liabilities		(6,500,000)			(6,500,000)			(2,600,000)
Long-term Risk Management Liabilities		(800,000)			(800,000)			(300,000)
Gross Amounts Offset in the Statement of Financial Position [Member] | Indiana Michigan Power Co [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		(6,700,000)			(6,700,000)			(2,300,000)
Long-term Risk Management Assets		0			0			(200,000)
Current Risk Management Liabilities		(6,700,000)			(6,700,000)			(3,400,000)
Long-term Risk Management Liabilities		0			0			(200,000)
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			0
Long-term Risk Management Assets		0			0			0
Current Risk Management Liabilities		0			0			(100,000)
Long-term Risk Management Liabilities		0			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		(400,000)			(400,000)			(700,000)
Long-term Risk Management Assets		(900,000)			(900,000)			0
Current Risk Management Liabilities		(400,000)			(400,000)			(800,000)
Long-term Risk Management Liabilities		(900,000)			(900,000)			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)			(400,000)
Long-term Risk Management Assets		0			0			(500,000)
Current Risk Management Liabilities		(400,000)			(400,000)			(500,000)
Long-term Risk Management Liabilities		0			0			(500,000)
Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member]
Fair Value of Derivative Instruments
Current Risk Management Assets		322,700,000			322,700,000			217,500,000
Long-term Risk Management Assets		255,400,000			255,400,000			321,200,000
Total Assets		578,100,000			578,100,000			538,700,000
Current Risk Management Liabilities		155,000,000.0			155,000,000.0			229,600,000
Long-term Risk Management Liabilities		261,400,000			261,400,000			241,800,000
Total Liabilities		416,400,000			416,400,000			471,400,000
Total MTM Derivative Contract Net Assets (Liabilities)		161,700,000			161,700,000			67,300,000
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			0
Long-term Risk Management Assets		0			0			0
Total Assets		0			0			0
Current Risk Management Liabilities		0			0			2,700,000
Long-term Risk Management Liabilities		0			0			0
Total Liabilities		0			0			2,700,000
Total MTM Derivative Contract Net Assets (Liabilities)		0			0			(2,700,000)
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		67,700,000			67,700,000			22,400,000
Long-term Risk Management Assets		0			0			0
Total Assets		67,700,000			67,700,000			22,400,000
Current Risk Management Liabilities		9,000,000.0			9,000,000.0			15,900,000
Long-term Risk Management Liabilities		4,300,000			4,300,000			6,600,000
Total Liabilities		13,300,000			13,300,000			22,500,000
Total MTM Derivative Contract Net Assets (Liabilities)		54,400,000			54,400,000			(100,000)
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		28,100,000			28,100,000			27,800,000
Long-term Risk Management Assets		0			0			11,800,000
Total Assets		28,100,000			28,100,000			39,600,000
Current Risk Management Liabilities		0			0			2,000,000.0
Long-term Risk Management Liabilities		0			0			0
Total Liabilities		0			0			2,000,000.0
Total MTM Derivative Contract Net Assets (Liabilities)		28,100,000			28,100,000			37,600,000
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			0
Long-term Risk Management Assets		0			0			0
Total Assets		0			0			0
Current Risk Management Liabilities		6,000,000.0			6,000,000.0			6,800,000
Long-term Risk Management Liabilities		37,200,000			37,200,000			43,900,000
Total Liabilities		43,200,000			43,200,000			50,700,000
Total MTM Derivative Contract Net Assets (Liabilities)		(43,200,000)			(43,200,000)			(50,700,000)
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		49,400,000			49,400,000			19,000,000.0
Long-term Risk Management Assets		0			0			0
Total Assets		49,400,000			49,400,000			19,000,000.0
Current Risk Management Liabilities		19,100,000			19,100,000			28,900,000
Long-term Risk Management Liabilities		3,700,000			3,700,000			1,000,000.0
Total Liabilities		22,800,000			22,800,000			29,900,000
Total MTM Derivative Contract Net Assets (Liabilities)		26,600,000			26,600,000			(10,900,000)
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		38,200,000			38,200,000			11,600,000
Long-term Risk Management Assets		0			0			0
Total Assets		38,200,000			38,200,000			11,600,000
Current Risk Management Liabilities		9,400,000			9,400,000			14,400,000
Long-term Risk Management Liabilities		1,700,000			1,700,000			1,200,000
Total Liabilities		11,100,000			11,100,000			15,600,000
Total MTM Derivative Contract Net Assets (Liabilities)		$ 27,100,000			$ 27,100,000			$ (4,000,000.0)
Power [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		339.4			339.4			246.8
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		51.5			51.5			16.8
Power [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		12.6			12.6			5.9
Power [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		2.1			2.1			2.2
Power [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		11.5			11.5			4.1
Power [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MWh		9.8			9.8			2.9
Natural Gas [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		170.7			170.7			151.6
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		47.5			47.5			37.3
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		48.0			48.0			34.9
Natural Gas [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Energy Notional Amount | MMBTU		19.9			19.9			17.9
Heating Oil and Gasoline [Member]
Commodity:
Derivative, Volume Notional Amount | gal		6.0			6.0			6.5
Heating Oil and Gasoline [Member] | AEP Texas Inc. [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1.5			1.5			1.8
Heating Oil and Gasoline [Member] | Appalachian Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		0.8			0.8			1.0
Heating Oil and Gasoline [Member] | Indiana Michigan Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1.0			1.0			0.6
Heating Oil and Gasoline [Member] | Ohio Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		1.0			1.0			1.2
Heating Oil and Gasoline [Member] | Public Service Co Of Oklahoma [Member]
Commodity:
Derivative, Volume Notional Amount | gal		0.6			0.6			0.7
Heating Oil and Gasoline [Member] | Southwestern Electric Power Co [Member]
Commodity:
Derivative, Volume Notional Amount | gal		0.7			0.7			0.9
Interest Rate Contract [Member]
Commodity:
Derivative, Notional Amount		$ 69,600,000			$ 69,600,000			$ 80,100,000
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		4,300,000		17,000,000.0	(21,400,000)		11,700,000
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		(53,000,000.0)		(141,800,000)	(97,700,000)		(289,200,000)
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		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		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		0
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		4,300,000		17,000,000.0	(21,500,000)		11,700,000
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		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		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		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		700,000		1,300,000	1,700,000		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		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		700,000		1,300,000	1,600,000		1,900,000
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	100,000		100,000
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		0	0		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		0
Other Operation Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		300,000		(100,000)	300,000		(100,000)
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		0	100,000		0
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		0	0		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		0	100,000		0
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		0	0		0
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		0	0		0
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		0	0		0
Maintenance Expense [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts		500,000		(300,000)	600,000		(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		(100,000)	100,000		(100,000)
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		100,000		0	100,000		0
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		0	100,000		0
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		0	100,000		0
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		0	0		0
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		100,000		0	100,000		0
Regulatory Assets [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	31,700,000		(12,400,000)	45,200,000		(37,200,000)
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]	100,000		(100,000)	300,000		(500,000)
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	[7]	15,200,000		5,900,000	15,100,000		(1,200,000)
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]	4,600,000		(1,600,000)	3,000,000.0		(2,100,000)
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]	(3,100,000)		(12,800,000)	5,500,000		(25,100,000)
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	[7]	8,900,000		(2,300,000)	7,700,000		(3,500,000)
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]	200,000		(900,000)	5,100,000		(2,400,000)
Regulatory Liabilities [Member]
Amount of Gain (Loss) Recognized on Risk Management Contracts
Amount of Gain (Loss) Recognized on Risk Management Contracts	[7]	92,500,000		102,000,000.0	145,200,000		100,500,000
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	[7]	(200,000)		0	0		0
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]	12,600,000		17,400,000	25,700,000		(8,800,000)
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]	7,100,000		3,600,000	9,300,000		4,800,000
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		0	0		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]	33,800,000		42,400,000	52,100,000		60,400,000
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]	$ 34,600,000		$ 33,600,000	$ 49,600,000		$ 45,500,000

[1] Amounts include $(26) million and $(30) million as of June 30, 2024 and December 31, 2023, 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 June 30, 2024 maturities of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), were as follows: Level 1 matures $(3) million in 2024 and $(4) million in periods 2025-2027; Level 2 matures $(22) million in 2024, $24 million in periods 2025-2027 and $6 million in periods 2028-2029; Level 3 matures $116 million in 2024, $142 million in periods 2025-2027, $22 million in periods 2028-2029 and $(12) million in periods 2030-2032.  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, 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

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