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DISPOSITION	9 Months Ended
DISPOSITION	Sep. 30, 2022
Discontinued Operations and Disposal Groups [Abstract]
DISPOSITION	DISPOSITION Sale of Certain Real Estate by The Peoples Gas Light and Coke Company In May 2022, we sold approximately 11 acres of real estate owned by PGL that was no longer being utilized in its operations, for $55.1 million. The real estate was located in Chicago, Illinois. As a result of the sale, a pre-tax gain in the amount of $54.5 million was recorded within other operation and maintenance expense on our income statement. The book value of the real estate included in the sale was not material and, therefore, was not presented as held for sale.