Regulatory Environment - PGL QIP Rider (Details) - Illinois Commerce Commission (ICC) - PGL $ in Millions	84 Months Ended
Dec. 31, 2022 USD ($)	Dec. 31, 2023 Assurance
Public Utilities, General Disclosures
Minimum annual costs included in PGL's QIP rider	$ 192
Maximum annual costs included in PGL's QIP rider	$ 348
Amount of assurance that PGL's QIP rider costs will be recoverable \| Assurance		0

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