Regulatory Environment - PGL QIP Rider (Details) - Illinois Commerce Commission (ICC) - PGL $ in Millions	Dec. 31, 2021 Assurance	Jul. 31, 2019 USD ($)
Public Utilities, General Disclosures
Rate base reduction from settlement of reconciliation		$ 7.0
Total refunds required to ratepayers from settlement		$ 7.3
Amount of assurance that PGL's QIP rider costs will be recoverable \| Assurance	0

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- Definition

Amount of disallowed costs for rate making purposes for recently completed plants in regulated industries.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section 35
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6500292&loc=d3e45799-110387

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 10.E)
-URI http://asc.fasb.org/extlink&oid=122136288&loc=d3e660019-123033

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- Definition

Amount of assurance that the costs incurred under PGL's Qualifying Infrastructure Plant rider will be recoverable.

+ References

No definition available.

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- Definition

The total amount required to be refunded to customers as a result of a legal settlement or order.

+ References

No definition available.

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