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Asset Acquisition, Percentage of Shares Acquired

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Asset Acquisition, Property, Plant and Equipment

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Asset Acquisition, Property, Plant and Equipment, Gross

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Asset Acquisition, Regulatory Liability

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Gain (Loss) on Disposition of Business net of Tax

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Proceeds From Noncontrolling Interests, Gross

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Wind Generation (MWs)

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of other-than-temporary decline in value that has been recognized against investment accounted for under equity method of accounting.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The number of real estate properties owned as of the balance sheet date.

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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ACQUISITIONS, DISPOSITIONS AND IMPAIRMENTS - Narrative (Details) $ in Millions	1 Months Ended								3 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($)	Jan. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) MW	Sep. 30, 2024 USD ($)	Feb. 29, 2024 USD ($)	Dec. 31, 2023 USD ($)	Aug. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2025 USD ($) facility	Dec. 31, 2023 USD ($)	Dec. 31, 2025 USD ($) facility	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 30, 2025	Aug. 31, 2025	May 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds received											$ 2,783	$ 0	$ 0
Pretax loss											0	0	93
Loss on disposal of business, net of tax													73
Asset impairments and other related charges									$ 66		66	143	86
New Mexico Renewable Development
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other than temporary impairment										$ 19
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| AEP OnSite Partners
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposal of business				$ 318
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| NMRD
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposal of business					$ 107
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Competitive Contracted Renewables
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposal of business							$ 1,200
SOUTHWESTERN ELECTRIC POWER COMPANY
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairments and other related charges											6	0	86
SOUTHWESTERN ELECTRIC POWER COMPANY \| Turk Generating Plant
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairments and other related charges						$ 86
PUBLIC SERVICE COMPANY OF OKLAHOMA \| Rock Falls [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business combination, consideration transferred								$ 146
AEP TRANSMISSION COMPANY, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds received											$ 2,783	$ 0	$ 0
AEP TRANSMISSION COMPANY, LLC \| Ohio Transmission And Indiana Michigan Transmission
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage selling		19.90%
Proceeds from noncontrolling interests, gross		$ 2,820
Cash proceeds received	$ 2,780
Wagon Wheel \| SOUTHWESTERN ELECTRIC POWER COMPANY
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares acquired									100.00%		100.00%
Top Hat \| APPALACHIAN POWER COMPANY
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares acquired														100.00%
Pixley \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares acquired																100.00%
Flat Ridge IV \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares acquired	100.00%
Green Country \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares acquired	100.00%
Asset acquisition, property, plant and equipment	$ 819
Asset acquisition, intangible liability	41
Asset acquisition, regulatory liability	$ 50
Wind Energy, LLC \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares acquired															100.00%
Four Electric Generation Facilities \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties \| facility									4		4
Payments to acquire facilities											$ 1,700
Diversion Wind Energy, LLC \| SOUTHWESTERN ELECTRIC POWER COMPANY
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares acquired			100.00%									100.00%
Wind generation MW \| MW			201
Property, plant and equipment, gross			$ 423									$ 423
Operating lease			20									20
Asset retirement obligations			$ 6									$ 6