REGULATORY ENVIRONMENT - PGL QIP RIDER (Details) - Illinois Commerce Commission (ICC) - PGL - Rider QIP Reconciliation $ in Millions	Jun. 30, 2024 USD ($) Assurance
Public Utilities, General Disclosures [Line Items]
Minimum annual costs included in PGL's QIP rider during open reconciliation years	$ 192
Maximum annual costs included in PGL's QIP rider during open reconciliation years	$ 348
Amount of assurance that PGL's QIP rider costs will be recoverable \| Assurance	0

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