COMMITMENTS, GUARANTEES AND CONTINGENCIES - Maximum Future Payments for Letters of Credit (Details) - Letter of Credit $ in Millions	Mar. 31, 2025 USD ($)
Other Commitments [Line Items]
Future payments	$ 252.1
SWEPCo
Other Commitments [Line Items]
Future payments	$ 11.2

Describes the maximum potential amount of consideration, undiscounted, that could be transferred under the registration payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482804/825-20-50-1

Name:	us-gaap_RegistrationPaymentArrangementMaximumPotentialConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant