ACQUISITIONS AND IMPAIRMENTS - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025
Asset Acquisition, Contingent Consideration [Line Items]
Asset Impairments and Other Related Charges		$ 31	$ 0
SOUTHWESTERN ELECTRIC POWER COMPANY
Asset Acquisition, Contingent Consideration [Line Items]
Asset Impairments and Other Related Charges	$ 31	$ 31	$ 0
Oregon Clean Energy Center \| INDIANA MICHIGAN POWER COMPANY
Asset Acquisition, Contingent Consideration [Line Items]
Percentage of shares acquired	100.00%	100.00%

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-2

Name:	us-gaap_OtherAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration