Variable Interest Entities (Details) $ in Millions		12 Months Ended
		Dec. 31, 2021 USD ($) MW		Dec. 31, 2020 USD ($)		Dec. 31, 2019 USD ($) MW	Dec. 31, 2018 USD ($)
ASSETS
Current Assets		$ 7,809.2		$ 4,351.5
Net Property, Plant and Equipment		66,001.3	[1]	63,901.6
Other Noncurrent Assets		13,858.2		12,504.1
Total Assets		87,668.7	[2]	80,757.2		$ 75,892.3
LIABILITIES AND EQUITY
Current Liabilities		12,426.7		9,926.7
Noncurrent Liabilities		52,518.5		50,010.8
Equity		22,680.2		20,774.5		19,913.2	$ 19,059.4
Total Liabilities and Equity		87,668.7		80,757.2
Variable Interest Entities (Textuals)
Securitization Bonds		603.5		716.4
Securitized Assets		552.8		657.0
Equity Method Investments		1,447.5		1,406.3		1,356.6
Equity Method Investment Income		(91.7)		(91.1)		(72.1)
Generation and Marketing [Member]
ASSETS
Net Property, Plant and Equipment		1,864.4		1,744.1
Total Assets		4,263.6		3,585.9		3,123.8
Variable Interest Entities (Textuals)
Equity Method Investments		487.8		467.0		459.5
Equity Method Investment Income		10.6		(3.2)		3.8
Unregulated Operation [Member]
ASSETS
Net Property, Plant and Equipment		1,991.8		1,927.0
Protected Cell Of Energy Insurance Services, Inc. [Member]
Variable Interest Entities (Textuals)
Insurance Premium Expense to Protected Cell		30.0		31.0		$ 34.0
Protected Cell Of Energy Insurance Services, Inc. [Member] | Variable Interest Entities [Member]
ASSETS
Current Assets		217.3		198.1
Net Property, Plant and Equipment		0.0		0.0
Other Noncurrent Assets		0.0		0.0
Total Assets		217.3		198.1
LIABILITIES AND EQUITY
Current Liabilities		37.5		43.1
Noncurrent Liabilities		82.3		62.5
Equity		97.5		92.5
Total Liabilities and Equity		$ 217.3		198.1
Transource Energy [Member]
Variable Interest Entities (Textuals)
Debt-to-Total Capitalization Maximum		67.50%
Transource Energy [Member] | Variable Interest Entities [Member]
ASSETS
Current Assets		$ 38.8		22.2
Net Property, Plant and Equipment		475.4		458.7
Other Noncurrent Assets		3.0		3.7
Total Assets		517.2		484.6
LIABILITIES AND EQUITY
Current Liabilities		12.5		32.6
Noncurrent Liabilities		216.9		185.0
Equity		287.8		267.0
Total Liabilities and Equity		517.2		484.6
Apple Blossom and Black Oak [Member]
Variable Interest Entities (Textuals)
Noncontrolling Interest in Variable Interest Entity		108.0		119.0
HLBV Income for Noncontrolling Interests		7.0		6.0
Apple Blossom and Black Oak [Member] | Variable Interest Entities [Member]
ASSETS
Current Assets		9.9		9.6
Net Property, Plant and Equipment		217.3		223.1
Other Noncurrent Assets		11.3		12.1
Total Assets		238.5		244.8
LIABILITIES AND EQUITY
Current Liabilities		6.6		5.3
Noncurrent Liabilities		5.2		4.9
Equity		226.7		234.6
Total Liabilities and Equity		238.5		244.8
Santa Rita East [Member]
Variable Interest Entities (Textuals)
Noncontrolling Interest in Variable Interest Entity		$ 59.0		61.0
Percentage of an Asset Acquired		85.00%
Production Tax Credits		$ 25.0		$ 23.0
Santa Rita East [Member] | Generation and Marketing [Member]
Variable Interest Entities (Textuals)
Percentage of an Asset Acquired		85.00%		10.00%		75.00%
WindGenerationMWs | MW		302				227
Santa Rita East [Member] | Variable Interest Entities [Member]
ASSETS
Current Assets		$ 7.6		$ 6.0
Net Property, Plant and Equipment		437.6		453.1
Other Noncurrent Assets		0.0		0.0
Total Assets		445.2		459.1
LIABILITIES AND EQUITY
Current Liabilities		5.8		3.5
Noncurrent Liabilities		7.0		6.7
Equity		432.4		448.9
Total Liabilities and Equity		$ 445.2		459.1
Santa Rita East [Member] | Initial Interest Acquired [Member]
Variable Interest Entities (Textuals)
Percentage of an Asset Acquired		75.00%
Santa Rita East [Member] | Additional 10 Percent [Member]
Variable Interest Entities (Textuals)
Percentage of an Asset Acquired		10.00%
AEP Credit, Inc.
Variable Interest Entities (Textuals)
Minimum Percentage of Equity AEP Provides		5.00%
Percentage Of Short Term Borrowing Needs In Excess Of Third Party Financings		25.00%
AEP Credit, Inc. | Variable Interest Entities [Member]
ASSETS
Current Assets		$ 996.6		960.4
Net Property, Plant and Equipment		0.0		0.0
Other Noncurrent Assets		10.4		12.9
Total Assets		1,007.0		973.3
LIABILITIES AND EQUITY
Current Liabilities		953.1		827.2
Noncurrent Liabilities		0.9		0.8
Equity		53.0		145.3
Total Liabilities and Equity		1,007.0		973.3
Dolet Hills Lignite Co, LLC [Member]
Variable Interest Entities (Textuals)
Equity Method Investment Income		$ (3.4)		(2.9)		$ (3.0)
Ohio Valley Electric Corporation [Member]
Variable Interest Entities (Textuals)
AEP's Ownership In OVEC		43.47%
Approximate OVEC Generating Capacity (MWs) | MW		2,400
Intercompany Power Agreement End Date		2040
Outstanding Indebtedness		$ 1,100.0		1,300.0
Dry Lake Solar Project [Member]
Variable Interest Entities (Textuals)
Noncontrolling Interest in Variable Interest Entity		$ 35.0
Percentage of an Asset Acquired		75.00%
Investment Tax Credits		$ 33.0
Dry Lake Solar Project [Member] | Generation and Marketing [Member]
Variable Interest Entities (Textuals)
Solar Generation MWs | MW		100
Dry Lake Solar Project [Member] | Variable Interest Entities [Member]
ASSETS
Current Assets		$ 4.0
Net Property, Plant and Equipment		146.1
Other Noncurrent Assets		0.3
Total Assets		150.4
LIABILITIES AND EQUITY
Current Liabilities		0.9
Noncurrent Liabilities		0.6
Equity		148.9
Total Liabilities and Equity		150.4
Capital Contribution From Parent [Member] | Ohio Valley Electric Corporation [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		4.4		4.4
Maximum Exposure		4.4		4.4
Retained Earnings [Member]
LIABILITIES AND EQUITY
Equity		11,667.1		10,687.8		9,900.9	9,325.3
AEP's Ratio of OVEC Debt [Member] | Ohio Valley Electric Corporation [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		0.0		0.0
Maximum Exposure	[3]	492.0		555.0
Total Investment [Member] | Ohio Valley Electric Corporation [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		4.4		4.4
Maximum Exposure		$ 496.4		559.4
Long-term PPA MWs [Member] | Santa Rita East [Member]
Variable Interest Entities (Textuals)
WindGenerationMWs | MW		260
Sold at Wholesale MWs [Member] | Santa Rita East [Member]
Variable Interest Entities (Textuals)
WindGenerationMWs | MW		42
Great Plains Energy Inc. [Member] | Transource Energy [Member]
Variable Interest Entities (Textuals)
Equity and Voting Ownership Percentage		13.50%
Cleco Power, LLC [Member]
Variable Interest Entities (Textuals)
Percentage of VIE Sales of Lignite Produced		50.00%
AEP Transmission Co [Member]
ASSETS
Current Assets		$ 331.3		235.8
Net Property, Plant and Equipment		11,935.7	[1]	10,772.8
Other Noncurrent Assets		257.4		237.4
Total Assets		12,524.4	[4]	11,246.0		9,890.8
LIABILITIES AND EQUITY
Current Liabilities		1,296.9		1,137.5
Noncurrent Liabilities		5,851.4		5,395.6
Total Liabilities and Equity		12,524.4		11,246.0
AEP Transmission Co [Member] | Unregulated Operation [Member]
ASSETS
Net Property, Plant and Equipment		0.3		0.7
AEP Transmission Co [Member] | Billings from AEP Service Corporation [Member]
Variable Interest Entities (Textuals)
Billings from VIE		267.1		270.3		242.3
AEP Transmission Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		23.3		45.9
Maximum Exposure		23.3		45.9
Appalachian Power Co [Member]
ASSETS
Current Assets		925.3		674.1
Net Property, Plant and Equipment		11,804.3		11,394.1
Other Noncurrent Assets		1,359.3		1,247.0
Total Assets		14,088.9		13,315.2
LIABILITIES AND EQUITY
Current Liabilities		1,415.9		1,217.7
Noncurrent Liabilities		8,025.1		7,753.2
Equity		4,647.9		4,344.3		4,172.4	4,006.1
Total Liabilities and Equity		14,088.9		13,315.2
Variable Interest Entities (Textuals)
Securitization Bonds		198.8		223.8
Securitized Assets		185.1		210.1
Amount Of Power Purchased From OVEC		104.3		94.4		104.5
Appalachian Power Co [Member] | Unregulated Operation [Member]
ASSETS
Net Property, Plant and Equipment		23.3		24.0
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member]
Variable Interest Entities (Textuals)
Securitized Assets		185.0		210.0
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Variable Interest Entities [Member]
ASSETS
Current Assets		16.0		16.8
Net Property, Plant and Equipment		0.0		0.0
Other Noncurrent Assets		187.8	[5]	212.7	[6]
Total Assets		203.8		229.5
LIABILITIES AND EQUITY
Current Liabilities		29.0		28.7
Noncurrent Liabilities		172.9		198.9
Equity		1.9		1.9
Total Liabilities and Equity		$ 203.8		229.5
Appalachian Power Co [Member] | Ohio Valley Electric Corporation [Member]
Variable Interest Entities (Textuals)
Power Participation Ratio		15.69%
Outstanding Indebtedness		$ 177.0		200.0
Appalachian Power Co [Member] | Billings from AEP Service Corporation [Member]
Variable Interest Entities (Textuals)
Billings from VIE		313.3		294.9		308.3
Appalachian Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		44.1		42.8
Maximum Exposure		44.1		42.8
Appalachian Power Co [Member] | Retained Earnings [Member]
LIABILITIES AND EQUITY
Equity		2,534.4		2,248.0		2,078.3	1,922.0
Appalachian Power Co [Member] | Other Noncurrent Assets [Member] | Appalachian Consumer Rate Relief Funding [Member]
Variable Interest Entities (Textuals)
Intercompany Item Eliminated in Consolidation		2.0		3.0
Appalachian Power Co [Member] | Current Liabilities [Member] | Appalachian Consumer Rate Relief Funding [Member]
Variable Interest Entities (Textuals)
Securitization Bonds		26.0		25.0
Appalachian Power Co [Member] | Noncurrent Liabilities [Member] | Appalachian Consumer Rate Relief Funding [Member]
Variable Interest Entities (Textuals)
Securitization Bonds		173.0		199.0
Indiana Michigan Power Co [Member]
ASSETS
Current Assets		439.4		418.8
Net Property, Plant and Equipment		7,310.9		7,052.3
Other Noncurrent Assets		4,657.9		4,167.2
Total Assets		12,408.2		11,638.3
LIABILITIES AND EQUITY
Current Liabilities		894.0		1,104.5
Noncurrent Liabilities		8,729.5		7,784.6
Equity		2,784.7		2,749.2		2,544.4	2,352.8
Total Liabilities and Equity		12,408.2		11,638.3
Variable Interest Entities (Textuals)
Amount Of Power Purchased From OVEC		52.2		47.2		52.3
Indiana Michigan Power Co [Member] | Unregulated Operation [Member]
ASSETS
Net Property, Plant and Equipment		23.3		28.2
Indiana Michigan Power Co [Member] | DCC Fuel [Member]
Variable Interest Entities (Textuals)
Payments Made by I&M to DCC Fuel		91.0		94.0		95.0
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Variable Interest Entities [Member]
ASSETS
Current Assets		65.2		76.1
Net Property, Plant and Equipment		118.6		138.9
Other Noncurrent Assets		57.2		70.9
Total Assets		241.0		285.9
LIABILITIES AND EQUITY
Current Liabilities		65.1		76.0
Noncurrent Liabilities		175.9		209.9
Equity		0.0		0.0
Total Liabilities and Equity		$ 241.0		285.9
Indiana Michigan Power Co [Member] | Ohio Valley Electric Corporation [Member]
Variable Interest Entities (Textuals)
Power Participation Ratio		7.85%
Outstanding Indebtedness		$ 89.0		100.0
Indiana Michigan Power Co [Member] | Billings from AEP Service Corporation [Member]
Variable Interest Entities (Textuals)
Billings from VIE		200.9		210.2		184.8
Indiana Michigan Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		21.8		27.1
Maximum Exposure		21.8		27.1
Indiana Michigan Power Co [Member] | Billings from AEP Generating Company [Member]
Variable Interest Entities (Textuals)
Billings from VIE		218.0		173.0		215.0
Indiana Michigan Power Co [Member] | Carrying Amount in AEP Generating Company's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		$ 18.0		9.0
Indiana Michigan Power Co [Member] | Rockport Generating Plant (Unit No. 1) [Member]
Variable Interest Entities (Textuals)
Jointly Owned Utility Plant, Proportionate Ownership Share		50.00%
Indiana Michigan Power Co [Member] | Retained Earnings [Member]
LIABILITIES AND EQUITY
Equity		$ 1,748.5		1,718.7		1,518.5	1,329.1
Ohio Power Co [Member]
ASSETS
Current Assets		327.5		256.3
Net Property, Plant and Equipment		7,963.0		7,452.1
Other Noncurrent Assets		975.3		1,002.0
Total Assets		9,265.8		8,710.4
LIABILITIES AND EQUITY
Current Liabilities		1,245.7		1,906.2
Noncurrent Liabilities		5,173.8		4,111.5
Equity		2,846.3		2,692.7		2,508.5	2,297.4
Total Liabilities and Equity		9,265.8		8,710.4
Variable Interest Entities (Textuals)
Amount Of Power Purchased From OVEC		133.0		120.8		132.7
Ohio Power Co [Member] | Unregulated Operation [Member]
ASSETS
Net Property, Plant and Equipment		$ 9.8		9.9
Ohio Power Co [Member] | Ohio Valley Electric Corporation [Member]
Variable Interest Entities (Textuals)
AEP's Ownership In OVEC		4.30%
Power Participation Ratio		19.93%
Outstanding Indebtedness		$ 226.0		255.0
Ohio Power Co [Member] | Billings from AEP Service Corporation [Member]
Variable Interest Entities (Textuals)
Billings from VIE		234.9		232.8		230.4
Ohio Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		25.5		33.9
Maximum Exposure		25.5		33.9
Ohio Power Co [Member] | Retained Earnings [Member]
LIABILITIES AND EQUITY
Equity		1,686.3		1,532.7		1,348.5	1,136.4
Public Service Co Of Oklahoma [Member]
ASSETS
Current Assets		386.8		181.3
Net Property, Plant and Equipment		4,802.8		4,320.0
Other Noncurrent Assets		1,209.4		489.4
Total Assets		6,399.0		4,990.7
LIABILITIES AND EQUITY
Current Liabilities		562.7		478.6
Noncurrent Liabilities		3,544.7		2,966.5
Equity		2,291.6		1,545.6		1,373.3	1,248.0
Total Liabilities and Equity		$ 6,399.0		4,990.7
Variable Interest Entities (Textuals)
Percentage of an Asset Acquired		45.50%
Public Service Co Of Oklahoma [Member] | Unregulated Operation [Member]
ASSETS
Net Property, Plant and Equipment		$ 5.3		6.9
Public Service Co Of Oklahoma [Member] | Billings from AEP Service Corporation [Member]
Variable Interest Entities (Textuals)
Billings from VIE		123.7		113.2		125.7
Public Service Co Of Oklahoma [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		13.7		15.7
Maximum Exposure		13.7		15.7
Public Service Co Of Oklahoma [Member] | Retained Earnings [Member]
LIABILITIES AND EQUITY
Equity		1,095.4		974.3		851.0	724.7
Southwestern Electric Power Co [Member]
ASSETS
Current Assets		668.5		428.0
Net Property, Plant and Equipment		7,400.1		7,088.2
Other Noncurrent Assets		1,257.1		637.9
Total Assets		9,325.7		8,154.1
LIABILITIES AND EQUITY
Current Liabilities		538.7		763.6
Noncurrent Liabilities		5,637.2		4,762.8
Equity		3,149.8		2,627.7		2,441.1	2,315.6
Total Liabilities and Equity		$ 9,325.7		8,154.1
Variable Interest Entities (Textuals)
Percentage of an Asset Acquired		54.50%
Equity Method Investment Income		$ (3.4)		(2.9)		(3.0)
Southwestern Electric Power Co [Member] | Unregulated Operation [Member]
ASSETS
Net Property, Plant and Equipment		53.9		97.8
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member]
Variable Interest Entities (Textuals)
Billings from VIE		162.0		131.0		110.0
Guarantees Of Mine Reclamation Amount		155.0
Estimated Final Cost Mine Reclamation		104.0
Amount Collected, Rider Mine Close Other Assets Noncurrent		10.0
Amount Collected Through Rider For Final Mine Closure And Reclamation Costs		85.0
Amount Collected, Rider Mine Close ARO Noncurrent		94.0
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Variable Interest Entities [Member]
ASSETS
Current Assets		77.2		88.0
Net Property, Plant and Equipment		51.8		97.3
Other Noncurrent Assets		104.1		99.3
Total Assets		233.1		284.6
LIABILITIES AND EQUITY
Current Liabilities		18.9		57.7
Noncurrent Liabilities		214.3		225.3
Equity		(0.1)		1.6
Total Liabilities and Equity		233.1		284.6
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member]
Variable Interest Entities (Textuals)
Billings from VIE		$ 47.0		142.0		55.0
Percentage of VIE Sales of Lignite Produced		50.00%
Percentage of DHLCs Debt Guaranteed by Each SWEPCo and CLECO		50.00%
Percentage of Management Fee Received by SWEPCo from DHLC		100.00%
Equity Method Investment Income		$ (3.4)		(2.9)		(3.0)
Southwestern Electric Power Co [Member] | Billings from AEP Service Corporation [Member]
Variable Interest Entities (Textuals)
Billings from VIE		168.6		161.8		169.5
Southwestern Electric Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		20.5		22.0
Maximum Exposure		20.5		22.0
Southwestern Electric Power Co [Member] | Capital Contribution From Parent [Member] | Dolet Hills Lignite Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		7.6		7.6
Maximum Exposure		7.6		7.6
Southwestern Electric Power Co [Member] | Retained Earnings [Member]
LIABILITIES AND EQUITY
Equity		2,050.9		1,811.9		1,629.5	1,508.4
Southwestern Electric Power Co [Member] | Retained Earnings [Member] | Dolet Hills Lignite Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		23.8		20.4
Maximum Exposure		23.8		20.4
Southwestern Electric Power Co [Member] | SWEPCo's Share of Obligations [Member] | Dolet Hills Lignite Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		0.0		0.0
Maximum Exposure		50.3		98.5
Southwestern Electric Power Co [Member] | Total Investment [Member] | Dolet Hills Lignite Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		31.4		28.0
Maximum Exposure		$ 81.7		126.5
AEP Generating Co [Member] | Rockport Generating Plant (Unit No. 1) [Member]
Variable Interest Entities (Textuals)
Jointly Owned Utility Plant, Proportionate Ownership Share		50.00%
AEP Generating Co [Member] | Rockport Generating Plant (Unit No. 2) [Member]
Variable Interest Entities (Textuals)
Percentage Interest in Lease		50.00%
Transource Energy [Member]
Variable Interest Entities (Textuals)
Equity and Voting Ownership Percentage		86.50%
AEP Texas Inc. [Member]
ASSETS
Current Assets		$ 347.2		310.9
Net Property, Plant and Equipment		10,635.4		9,813.6
Other Noncurrent Assets		854.1		905.7
Total Assets		11,836.7		11,030.2
LIABILITIES AND EQUITY
Current Liabilities		1,311.7		676.8
Noncurrent Liabilities		6,930.8		7,147.4
Equity		3,594.2		3,206.0		2,961.1	2,580.5
Total Liabilities and Equity		11,836.7		11,030.2
Variable Interest Entities (Textuals)
Securitization Bonds		404.7		492.6
Securitized Assets		$ 367.6		446.8
Jointly Owned Utility Plant, Proportionate Ownership Share		54.69%
AEP Texas Inc. [Member] | Unregulated Operation [Member]
ASSETS
Net Property, Plant and Equipment		$ 1.2		1.2
AEP Texas Inc. [Member] | AEP Texas Central Transition Funding Co [Member]
Variable Interest Entities (Textuals)
Securitized Assets		184.0		242.0
AEP Texas Inc. [Member] | AEP Texas Central Transition Funding Co [Member] | Variable Interest Entities [Member]
ASSETS
Current Assets		24.9		61.2
Net Property, Plant and Equipment		0.0		0.0
Other Noncurrent Assets		208.3	[7]	273.9	[8]
Total Assets		233.2		335.1
LIABILITIES AND EQUITY
Current Liabilities		71.2		69.8
Noncurrent Liabilities		157.8		246.5
Equity		4.2		18.8
Total Liabilities and Equity		233.2		335.1
AEP Texas Inc. [Member] | Restoration Funding [Member]
Variable Interest Entities (Textuals)
Securitized Assets		183.0		205.0
AEP Texas Inc. [Member] | Restoration Funding [Member] | Variable Interest Entities [Member]
ASSETS
Current Assets		24.3		23.3
Net Property, Plant and Equipment		0.0		0.0
Other Noncurrent Assets		192.6	[9]	214.9	[10]
Total Assets		216.9		238.2
LIABILITIES AND EQUITY
Current Liabilities		36.1		33.9
Noncurrent Liabilities		179.6		203.1
Equity		1.2		1.2
Total Liabilities and Equity		216.9		238.2
AEP Texas Inc. [Member] | Billings from AEP Service Corporation [Member]
Variable Interest Entities (Textuals)
Billings from VIE		206.9		199.4		206.6
AEP Texas Inc. [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
As Reported on the Balance Sheet		22.2		30.5
Maximum Exposure		22.2		30.5
AEP Texas Inc. [Member] | Retained Earnings [Member]
LIABILITIES AND EQUITY
Equity		2,046.8		1,757.0		1,516.0	$ 1,337.7
AEP Texas Inc. [Member] | Other Noncurrent Assets [Member] | AEP Texas Central Transition Funding Co [Member]
Variable Interest Entities (Textuals)
Intercompany Item Eliminated in Consolidation		24.0		32.0
AEP Texas Inc. [Member] | Other Noncurrent Assets [Member] | Restoration Funding [Member]
Variable Interest Entities (Textuals)
Intercompany Item Eliminated in Consolidation		8.0		9.0
AEP Texas Inc. [Member] | Current Liabilities [Member] | AEP Texas Central Transition Funding Co [Member]
Variable Interest Entities (Textuals)
Securitization Bonds		68.0		66.0
AEP Texas Inc. [Member] | Current Liabilities [Member] | Restoration Funding [Member]
Variable Interest Entities (Textuals)
Securitization Bonds		23.0		23.0
AEP Texas Inc. [Member] | Noncurrent Liabilities [Member] | AEP Texas Central Transition Funding Co [Member]
Variable Interest Entities (Textuals)
Securitization Bonds		141.0		209.0
AEP Texas Inc. [Member] | Noncurrent Liabilities [Member] | Restoration Funding [Member]
Variable Interest Entities (Textuals)
Securitization Bonds		$ 173.0		195.0
Parent Company [Member] | Ohio Valley Electric Corporation [Member]
Variable Interest Entities (Textuals)
AEP's Ownership In OVEC		39.17%
Joint Venture Wind Farms [Member]
Variable Interest Entities (Textuals)
Equity Method Investment, Ownership Percentage		50.00%
Production Tax Credits		$ 33.0		36.0
Equity Method Investments		399.0		376.0
Equity Method Investment Income		$ (12.0)		2.0
Berkshire Hathaway [Member]
Variable Interest Entities (Textuals)
Equity Method Investment, Ownership Percentage		50.00%
AEP Transmission Holdco [Member]
Variable Interest Entities (Textuals)
Equity Method Investment, Ownership Percentage		50.00%
BP Wind Energy [Member]
Variable Interest Entities (Textuals)
Equity Method Investment, Ownership Percentage		50.00%
ETT [Member]
Variable Interest Entities (Textuals)
Equity Method Investments		$ 733.0		732.0
Equity Method Investment Income		$ (66.0)		$ (68.0)		$ (66.0)

[1] 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.

[2] Amount includes Assets Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 7 for additional information.

[3] Based on the Registrants’ power participation ratios APCo, I&M and OPCo’s share of OVEC debt was $177 million, $89 million and $226 million as of December 31, 2021 and $200 million, $100 million and $255 million as of December 31, 2020, respectively.

[4] Amount includes Assets Held for Sale on the balance sheet. See “Disposition of KPCo and KTCo” section of Note 7 for additional information.

[5] Includes an intercompany item eliminated in consolidation of $2 million.

[6] Includes an intercompany item eliminated in consolidation of $3 million.

[7] Includes an intercompany item eliminated in consolidation of $24 million.

[8] Includes an intercompany item eliminated in consolidation of $32 million.

[9] Includes an intercompany item eliminated in consolidation of $8 million.

[10] Includes an intercompany item eliminated in consolidation of $9 million.