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Property Sale
9 Months Ended
Sep. 30, 2021
Discontinued Operations and Disposal Groups [Abstract]  
Property sale Property sale
Gain on exchange of property and construction easements in Chicago

During the first quarter of 2021, the Company exchanged property and construction easements in Chicago with a government agency for proceeds of $103 million including cash of $61 million and property assets at a fair value of $42 million. Fair value was determined based on comparable market transactions. The Company recorded a gain in the first quarter within "Purchased services and other" of $50 million ($38 million after tax) from the transaction, and a deferred gain of $53 million which will be recognized in income over the period of use of certain easements.

For the three and nine months ended September 30, 2021, the Company recognized $5 million and $9 million, respectively, of the deferred gain into income.