RATE MATTERS - OPCo Rate Matters (Details) $ in Millions	3 Months Ended
Mar. 31, 2025 USD ($)
OPCo \| OVEC-Related Purchased Power
Public Utilities, General Disclosures [Line Items]
Estimated reduction related to deferred costs no longer recoverable	$ 35

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.

No definition available.

Name:	us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration