Acquisitions, Assets and Liabilities Held for Sale, Dispositions and Impairments (Details)		3 Months Ended		12 Months Ended
		Jun. 30, 2020 USD ($)	Jun. 30, 2019 MW	Dec. 31, 2021 USD ($) Rate MW GW		Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) MW
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Asset Impairments and Other Related Charges				$ 11,600,000		$ 0	$ 156,400,000
Asset Impairment Charges
Utilities Operating Expense, Operations				2,547,700,000		2,572,400,000	2,743,700,000
Additional Paid in Capital				7,172,600,000		6,588,900,000
Asset Retirement Obligation, Liabilities Settled	[2],[3],[4],[5]			41,400,000	[1]	188,000,000.0
Property, Plant and Equipment, Generation				23,088,100,000		23,133,900,000
Obligations Under Operating Leases				492,800,000		638,400,000
Customers				720,900,000		613,600,000
Materials and Supplies				681,300,000		680,600,000
Total Property, Plant and Equipment, Net				66,001,300,000	[6]	63,901,600,000
Noncurrent Regulatory Assets				4,142,300,000	[7]	3,527,000,000
Assets Held for Sale				2,919,700,000		0
Accounts Payable, Current				2,054,600,000		1,709,700,000
Long-term Debt, Current Maturities				2,153,800,000		2,086,100,000	1,598,700,000
Customer Deposits, Current				321,600,000		335,600,000
Deferred Tax Liabilities, Net, Noncurrent				8,202,500,000		8,240,900,000
Regulatory Liabilities and Deferred Investment Tax Credits				8,686,300,000	[8]	8,378,700,000
Long-term Debt, Excluding Current Maturities				31,300,700,000		28,986,400,000	25,126,800,000
Liabilities Held for Sale				1,880,900,000		0
Property, Plant and Equipment, Other				5,682,900,000		5,294,600,000
North Central Wind Energy Facilities
Asset Impairment Charges
Payments to Acquire Property, Plant, and Equipment				(652,800,000)		0	0
Dry Lake Solar Project [Member]
Asset Impairment Charges
Payments to Acquire Property, Plant, and Equipment				(114,400,000)		0	0
Vertically Integrated Utilities [Member]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Asset Impairments and Other Related Charges				11,600,000			92,900,000
Asset Impairment Charges
Proceeds from Divestiture of Businesses				1,450,000,000
Total Property, Plant and Equipment, Net				32,897,300,000		33,437,100,000
Long-term Debt, Current Maturities				1,022,400,000		1,034,600,000	704,700,000
Long-term Debt, Excluding Current Maturities				12,964,400,000		12,375,600,000	12,162,000,000
Enterprise Value				$ 2,850,000,000
Vertically Integrated Utilities [Member] | Sundance [Member]
WindGenerationMWs | MW				199
Vertically Integrated Utilities [Member] | Maverick [Member]
WindGenerationMWs | MW				287
Vertically Integrated Utilities [Member] | Traverse [Member]
WindGenerationMWs | MW				998
Vertically Integrated Utilities [Member] | Kentucky Power Company and Kentucky Transmission Company
Asset Impairment Charges
Customers				$ 33,200,000
Materials and Supplies				30,600,000
Total Property, Plant and Equipment, Net				2,302,700,000
Noncurrent Regulatory Assets				484,700,000
Disposal Group, Including Discontinued Operation, Other Assets				68,500,000
Assets Held for Sale				2,919,700,000
Accounts Payable, Current				53,400,000
Long-term Debt, Current Maturities				200,000,000.0
Customer Deposits, Current				32,400,000
Deferred Tax Liabilities, Net, Noncurrent				441,600,000
Regulatory Liabilities and Deferred Investment Tax Credits				148,100,000
Disposal Group, Including Discontinued Operation, Other Liabilities, Current				102,300,000
Long-term Debt, Excluding Current Maturities				903,100,000
Liabilities Held for Sale				1,880,900,000
Vertically Integrated Utilities [Member] | North Central Wind Energy Facilities | Sundance [Member]
Asset Impairment Charges
Payments to Acquire Property, Plant, and Equipment				270,000,000
Vertically Integrated Utilities [Member] | North Central Wind Energy Facilities | Maverick [Member]
Asset Impairment Charges
Payments to Acquire Property, Plant, and Equipment				383,000,000
Generation and Marketing [Member]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Asset Impairments and Other Related Charges				0			31,000,000.0
Asset Impairment Charges
Total Property, Plant and Equipment, Net				1,864,400,000		1,744,100,000
Long-term Debt, Current Maturities				0		0	0
Long-term Debt, Excluding Current Maturities				$ 0		0	0
Utility Plant Generation Resources | GW				1.6
Generation and Marketing [Member] | Dry Lake Solar Project [Member]
Asset Impairment Charges
Payments to Acquire Property, Plant, and Equipment				$ 114,000,000
Generation and Marketing [Member] | Dry Lake Solar Project [Member] | Payment When Put in Service
Asset Impairment Charges
Payments to Acquire Property, Plant, and Equipment				11,000,000
Generation and Marketing [Member] | Dry Lake Solar Project [Member] | Payment at Closing
Asset Impairment Charges
Payments to Acquire Property, Plant, and Equipment				103,000,000
Transmission and Distribution Companies [Member]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Asset Impairments and Other Related Charges				0			32,500,000
Asset Impairment Charges
Total Property, Plant and Equipment, Net				18,598,300,000		17,265,700,000
Long-term Debt, Current Maturities				716,100,000		588,800,000	392,200,000
Long-term Debt, Excluding Current Maturities				7,433,200,000		6,661,900,000	6,248,100,000
AEP Transmission Holdco
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Asset Impairments and Other Related Charges				0			0
Asset Impairment Charges
Total Property, Plant and Equipment, Net				12,411,200,000		11,231,500,000
Long-term Debt, Current Maturities				106,400,000		52,300,000	0
Long-term Debt, Excluding Current Maturities				4,442,700,000		4,075,700,000	3,593,800,000
Enterprise Value				2,850,000,000
AEP Transmission Holdco | Kentucky Transmission Company
Asset Impairment Charges
Customers				1,500,000
Materials and Supplies				0
Total Property, Plant and Equipment, Net				165,300,000
Noncurrent Regulatory Assets				0
Disposal Group, Including Discontinued Operation, Other Assets				1,100,000
Assets Held for Sale				167,900,000
Accounts Payable, Current				1,100,000
Long-term Debt, Current Maturities				0
Customer Deposits, Current				0
Deferred Tax Liabilities, Net, Noncurrent				15,400,000
Regulatory Liabilities and Deferred Investment Tax Credits				7,600,000
Disposal Group, Including Discontinued Operation, Other Liabilities, Current				3,500,000
Long-term Debt, Excluding Current Maturities				0
Liabilities Held for Sale				$ 27,600,000
AEP Texas Inc. [Member]
Jointly Owned Utility Plant, Proportionate Ownership Share				54.69%
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Asset Impairments and Other Related Charges				$ 0		0	32,500,000
Asset Impairment Charges
Utilities Operating Expense, Operations				489,500,000		488,900,000	492,000,000.0
Additional Paid in Capital				1,553,900,000		1,457,900,000
Asset Retirement Obligation, Liabilities Settled	[3],[4]			400,000		8,500,000
Obligations Under Operating Leases				61,300,000		71,000,000.0
Customers				123,400,000		112,800,000
Materials and Supplies				73,900,000		70,000,000.0
Total Property, Plant and Equipment, Net				10,635,400,000		9,813,600,000
Noncurrent Regulatory Assets				275,200,000		266,800,000
Accounts Payable, Current				306,300,000		231,700,000
Long-term Debt, Current Maturities				716,000,000.0		88,700,000
Deferred Tax Liabilities, Net, Noncurrent				1,088,900,000		1,016,700,000
Regulatory Liabilities and Deferred Investment Tax Credits				1,242,000,000		1,270,800,000
Long-term Debt, Excluding Current Maturities				4,464,800,000		4,731,700,000
Property, Plant and Equipment, Other				961,100,000		868,400,000
AEP Transmission Co [Member]
Asset Impairment Charges
Utilities Operating Expense, Operations				105,500,000		99,800,000	93,900,000
Payments to Acquire Property, Plant, and Equipment				17,900,000		6,000,000.0	9,400,000
Obligations Under Operating Leases				1,300,000		400,000
Customers				22,500,000		22,900,000
Materials and Supplies				9,300,000		8,500,000
Total Property, Plant and Equipment, Net				11,935,700,000	[6]	10,772,800,000
Noncurrent Regulatory Assets				8,500,000		15,100,000
Assets Held for Sale				167,900,000		0
Accounts Payable, Current				460,100,000		380,400,000
Long-term Debt, Current Maturities				104,000,000.0		50,000,000.0
Deferred Tax Liabilities, Net, Noncurrent				962,900,000		906,900,000
Regulatory Liabilities and Deferred Investment Tax Credits				644,100,000	[9]	581,800,000
Long-term Debt, Excluding Current Maturities				4,239,900,000		3,898,500,000
Liabilities Held for Sale				27,600,000		0
Property, Plant and Equipment, Other				427,400,000		329,500,000
AEP Transmission Co [Member] | AEP Transmission Holdco
Asset Impairment Charges
Proceeds from Divestiture of Businesses				1,450,000,000
Appalachian Power Co [Member]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Asset Impairments and Other Related Charges				0		0	92,900,000
Asset Impairment Charges
Utilities Operating Expense, Operations				610,000,000.0		530,500,000	567,600,000
Additional Paid in Capital				1,828,700,000		1,828,700,000
Asset Retirement Obligation, Liabilities Settled	[3],[4]			6,900,000		7,800,000
Property, Plant and Equipment, Generation				6,683,900,000		6,633,700,000
Obligations Under Operating Leases				52,400,000		64,400,000
Customers				158,500,000		142,800,000
Materials and Supplies				109,800,000		99,600,000
Total Property, Plant and Equipment, Net				11,804,300,000		11,394,100,000
Noncurrent Regulatory Assets				757,600,000		686,300,000
Accounts Payable, Current				262,200,000		212,000,000.0
Long-term Debt, Current Maturities				480,700,000		518,300,000
Customer Deposits, Current				73,900,000		77,800,000
Deferred Tax Liabilities, Net, Noncurrent				1,804,700,000		1,749,900,000
Regulatory Liabilities and Deferred Investment Tax Credits				1,238,800,000		1,224,700,000
Long-term Debt, Excluding Current Maturities				4,458,200,000		4,315,800,000
Property, Plant and Equipment, Other				696,600,000		627,200,000
Indiana Michigan Power Co [Member]
Cost of Purchased Power from Affiliate				217,900,000		172,800,000	214,900,000
Asset Impairment Charges
Utilities Operating Expense, Operations				645,200,000		650,000,000.0	641,200,000
Additional Paid in Capital				980,900,000		980,900,000
Asset Retirement Obligation, Liabilities Settled	[3],[4],[5]			100,000		200,000
Property, Plant and Equipment, Generation				5,531,800,000		5,264,700,000
Obligations Under Operating Leases				48,900,000		135,900,000
Customers				40,600,000		44,000,000.0
Materials and Supplies				175,200,000		175,800,000
Total Property, Plant and Equipment, Net				7,310,900,000		7,052,300,000
Noncurrent Regulatory Assets				410,900,000		404,800,000
Accounts Payable, Current				174,400,000		153,200,000
Long-term Debt, Current Maturities				67,000,000.0		369,600,000
Customer Deposits, Current				45,200,000		41,700,000
Deferred Tax Liabilities, Net, Noncurrent				1,100,200,000		1,064,400,000
Regulatory Liabilities and Deferred Investment Tax Credits				2,447,900,000		2,041,900,000
Long-term Debt, Excluding Current Maturities				3,128,000,000		2,660,300,000
Property, Plant and Equipment, Other				792,900,000		686,700,000
Ohio Power Co [Member]
Cost of Purchased Power from Affiliate				51,900,000		119,700,000	156,000,000.0
Asset Impairment Charges
Utilities Operating Expense, Operations				836,800,000		822,600,000	742,600,000
Additional Paid in Capital				838,800,000		838,800,000
Asset Retirement Obligation, Liabilities Settled	[3]			100,000		0
Obligations Under Operating Leases				68,600,000		79,500,000
Customers				71,600,000		50,000,000.0
Materials and Supplies				74,100,000		66,900,000
Total Property, Plant and Equipment, Net				7,963,000,000		7,452,100,000
Noncurrent Regulatory Assets				293,000,000.0		385,800,000
Accounts Payable, Current				213,500,000		181,000,000.0
Long-term Debt, Current Maturities				100,000		500,100,000
Customer Deposits, Current				66,400,000		55,100,000
Deferred Tax Liabilities, Net, Noncurrent				1,000,900,000		955,100,000
Regulatory Liabilities and Deferred Investment Tax Credits				1,020,900,000		1,005,200,000
Long-term Debt, Excluding Current Maturities				2,968,400,000		1,930,100,000
Property, Plant and Equipment, Other				$ 992,900,000		899,600,000
Public Service Co Of Oklahoma [Member]
Percentage of an Asset Acquired				45.50%
Asset Impairment Charges
Utilities Operating Expense, Operations				$ 353,800,000		327,300,000	315,000,000.0
Additional Paid in Capital				1,039,000,000		414,000,000.0
Asset Retirement Obligation, Liabilities Settled	[3],[4]			700,000		3,100,000
Payments to Acquire Property, Plant, and Equipment				(297,000,000.0)		0	0
Property, Plant and Equipment, Generation				1,802,400,000		1,480,700,000
Obligations Under Operating Leases				62,200,000		36,200,000
Customers				41,500,000		30,800,000
Materials and Supplies				56,200,000		54,000,000.0
Total Property, Plant and Equipment, Net				4,802,800,000		4,320,000,000
Noncurrent Regulatory Assets				1,037,400,000		375,000,000.0
Accounts Payable, Current				157,400,000		107,000,000.0
Long-term Debt, Current Maturities				125,500,000		500,000
Customer Deposits, Current				56,200,000		54,800,000
Deferred Tax Liabilities, Net, Noncurrent				782,300,000		688,500,000
Regulatory Liabilities and Deferred Investment Tax Credits				835,300,000		802,200,000
Long-term Debt, Excluding Current Maturities				1,788,000,000		1,373,300,000
Property, Plant and Equipment, Other				437,000,000.0		393,300,000
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member] | Sundance [Member]
Asset Impairment Charges
Obligations Under Operating Leases				13,000,000
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member] | Maverick [Member]
Asset Impairment Charges
Obligations Under Operating Leases				$ 18,000,000
Southwestern Electric Power Co [Member]
Percentage of an Asset Acquired				54.50%
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Asset Impairments and Other Related Charges				$ 11,600,000		0	0
Asset Impairment Charges
Utilities Operating Expense, Operations				360,300,000		338,300,000	348,000,000.0
Additional Paid in Capital				1,092,200,000		812,200,000
Asset Retirement Obligation, Liabilities Settled	[2],[3],[4]			20,900,000		10,900,000
Payments to Acquire Property, Plant, and Equipment				(355,800,000)		0	0
Property, Plant and Equipment, Generation				4,734,500,000		4,681,400,000
Obligations Under Operating Leases				77,700,000		44,100,000
Customers				35,800,000		27,100,000
Materials and Supplies				81,900,000		95,800,000
Total Property, Plant and Equipment, Net				7,400,100,000		7,088,200,000
Noncurrent Regulatory Assets				1,005,300,000		403,100,000
Accounts Payable, Current				163,600,000		135,900,000
Long-term Debt, Current Maturities				6,200,000		106,200,000
Customer Deposits, Current				62,400,000		61,300,000
Deferred Tax Liabilities, Net, Noncurrent				1,087,600,000		1,017,600,000
Regulatory Liabilities and Deferred Investment Tax Credits				806,900,000		863,400,000
Long-term Debt, Excluding Current Maturities				3,389,000,000		2,530,200,000
Property, Plant and Equipment, Other				764,000,000.0		788,800,000
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member] | Sundance [Member]
Asset Impairment Charges
Obligations Under Operating Leases				15,000,000
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member] | Maverick [Member]
Asset Impairment Charges
Obligations Under Operating Leases				22,000,000
Conesville Generating Station (Unit No. 4) [Member] | Generation and Marketing [Member]
Asset Impairment Charges
Fair Value of Impaired Assets							0
Utilities Operating Expense, Operations							31,000,000
Payments for (Proceeds from) Removal Costs		$ 26,000,000				98,000,000
Asset Retirement Obligation, Liabilities Settled						106,000,000
Payments for Removal Costs				$ 15,000,000		57,000,000
Trent and Desert Sky Wind Farms [Member] | Generation and Marketing [Member]
Asset Impairment Charges
Payments to Acquire Businesses, Gross						57,000,000
Redeemable Noncontrolling Interest						63,000,000
Additional Paid in Capital						6,000,000
Mitchell Power Plant
Asset Impairment Charges
Approximate OVEC Generating Capacity (MWs) | MW				1,560
Mitchell Power Plant | Kentucky Power Co [Member]
Asset Impairment Charges
Ownership Interest in Mitchell Power Plant				50.00%
Mitchell Power Plant | Wheeling Power Company
Asset Impairment Charges
Ownership Interest in Mitchell Power Plant				50.00%
AEP Wind Holdings LLC [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired							134,800,000
WindGenerationMWs | MW			724
AEP Wind Holdings LLC [Member] | Noncontrolling Interests [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired							134,800,000
AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Percentage of an Asset Acquired | Rate				50.00%
WindGenerationMWs | MW				724
Noncash or Part Noncash Acquisition, Value of Assets Acquired							1,100,000,000
Asset Impairment Charges
Payments to Acquire Businesses, Gross							580,400,000
Maximum Potential Amount of Future Payments Associated with Guarantee				$ 142,000,000
Guarantor Obligations, Current Carrying Value				28,000,000
Guarantor Obligations, Current Carrying Value, Contingent Portion				2,000,000
AEP Wind Holdings LLC [Member] | Generation and Marketing [Member] | Noncontrolling Interests [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired							135,000,000
AEP Wind Holdings LLC [Member] | Indiana Michigan Power Co [Member] | Generation and Marketing [Member]
Cost of Purchased Power from Affiliate				10,000,000		11,000,000	9,000,000
AEP Wind Holdings LLC [Member] | Ohio Power Co [Member] | Generation and Marketing [Member]
Cost of Purchased Power from Affiliate				20,000,000		23,000,000	17,000,000
AEP Wind Holdings LLC [Member] | Southwestern Electric Power Co [Member] | Generation and Marketing [Member]
Cost of Purchased Power from Affiliate				$ 14,000,000		14,000,000	10,000,000
Santa Rita East [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired						(43,700,000)	118,800,000
Percentage of an Asset Acquired				85.00%
Santa Rita East [Member] | Noncontrolling Interests [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired						(43,700,000)	$ 118,800,000
Santa Rita East [Member] | Generation and Marketing [Member]
Noncash Contribution of Assets by Noncontrolling Interest						$ 44,000,000
Percentage of an Asset Acquired				85.00%		10.00%	75.00%
WindGenerationMWs | MW				302			227
Asset Impairment Charges
Payments to Acquire Businesses, Gross						$ 44,000,000	$ 356,000,000
Dry Lake Solar Project [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired				$ 18,900,000
Percentage of an Asset Acquired				75.00%
Dry Lake Solar Project [Member] | Noncontrolling Interests [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired				$ 18,900,000
Dry Lake Solar Project [Member] | Generation and Marketing [Member]
Asset Impairment Charges
Solar Generation MWs | MW				100
North Central Wind Energy Facilities
Asset Impairment Charges
Payments to Acquire Property, Plant, and Equipment				$ 2,000,000,000
North Central Wind Energy Facilities | Vertically Integrated Utilities [Member]
WindGenerationMWs | MW				1,484
North Central Wind Energy Facilities | Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member]
Asset Impairment Charges
Property, Plant and Equipment, Generation				$ 316,000,000
North Central Wind Energy Facilities | Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member]
Asset Impairment Charges
Property, Plant and Equipment, Generation				378,000,000
Sempra Renewable LLC and Santa Rita | Generation and Marketing [Member]
Asset Impairment Charges
Noncash or Part Noncash Acquisition, Debt Assumed							364,000,000
Property, Plant and Equipment, Other							404,000,000
Current Liabilities [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed							12,900,000
Current Assets [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired							8,800,000
Property, Plant and Equipment [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired							238,100,000
Asset Retirement Obligation [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed							5,700,000
Equity Method Investments [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired							404,000,000.0
Liabilities, Total [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed							18,600,000
Other Noncurrent Assets [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired							82,900,000
Noncontrolling Interests [Member] | Dry Lake Solar Project [Member]
Noncash Contribution of Assets by Noncontrolling Interest				$ 35,300,000		$ 0	0
Noncontrolling Interests [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Noncash Contribution of Assets by Noncontrolling Interest							134,800,000
Total Assets [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Noncash or Part Noncash Acquisition, Other Assets Acquired							733,800,000
Total Liabilities And Equity [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed							153,400,000
2019 Texas Base Rate Case [Member] | AEP Texas Inc. [Member] | Transmission and Distribution Companies [Member]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Asset Impairments and Other Related Charges							33,000,000
2017-2019 Virginia Triennial Review [Member] | Appalachian Power Co [Member] | Vertically Integrated Utilities [Member] | Plant Retirement Costs - Unrecovered Plant [Member]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Asset Impairments and Other Related Charges							$ 93,000,000

[1] Includes $18 million of ARO classified as Liabilities Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 7 for additional information.

[2] Includes ARO related to Sabine and DHLC.

[3] Includes ARO related to asbestos removal.

[4] Includes ARO related to ash disposal facilities.

[5] Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.93 billion and $1.80 billion as of December 31, 2021 and 2020, respectively.

[6] Amount excludes $2.3 billion and $165 million for AEP and AEPTCo, respectively, of Property, Plant and Equipment - Net classified as Assets Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 7 for additional information.

[7] 2021 amounts exclude $485 million of regulatory assets classified as Assets Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 7 for additional information.

[8] 2021 amounts exclude $148 million of regulatory liabilities classified as Liabilities Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 7 for additional information.

[9] 2021 amounts exclude $8 million of regulatory liabilities classified as Liabilities Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 7 for additional information.