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Discontinued Operations	12 Months Ended
Discontinued Operations	Dec. 31, 2017
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations	15. Discontinued Operations Discontinued operations in the Statement of Consolidated Income and the Statement of Consolidated Cash Flows reflects the results of our ownership in an energy trading partnership through the date of disposal in February 2015, which was part of our former Marketing and Refining segment.