XML 59 R13.htm IDEA: XBRL DOCUMENT

Description Of The Business And Basis Of Presentation	12 Months Ended
Description Of The Business And Basis Of Presentation	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business and Basis of Presentation	DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION Description of the Business We are a leading, integrated, downstream energy company headquartered in Findlay, Ohio. We operate the nation's largest refining system with more than 3 million barrels per day of crude oil capacity across 16 refineries. MPC's marketing system includes branded locations across the United States, which primarily include Marathon branded outlets. We own and operate retail convenience stores across the United States. We also own the general partner and majority limited partner interests in two midstream companies, MPLX LP (“MPLX”) and Andeavor Logistics LP (“ANDX”), which own and operate crude oil and light product transportation and logistics infrastructure as well as gathering, processing, and fractionation assets. Refer to Note 5 for further information on the Andeavor acquisition, which closed on October 1, 2018, and to Note 10 for additional information about our operations. Basis of Presentation Our results of operations and cash flows consist of consolidated MPC activities. All significant intercompany transactions and accounts have been eliminated. Certain prior period financial statement amounts have been reclassified to conform to current period presentation.