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Property Sale
3 Months Ended
Mar. 31, 2021
Discontinued Operations and Disposal Groups [Abstract]  
Property sale Property sale
Gain on exchange of property and easements in Chicago

During the first quarter of 2021, the Company exchanged property and property 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.