REGULATORY ENVIRONMENT - TPTFA Rider (Details)	Oct. 27, 2021
Subsequent event \| Illinois Commerce Commission (ICC) \| TPTFA Rider
Public Utilities, General Disclosures [Line Items]
Recovery period of regulatory asset	12 months

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