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Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The combined federal, state and foreign income tax rate was 20 percent and 19 percent for the three months ended September 30, 2019 and 2018, respectively, and 21 percent and 18 percent for the nine months ended September 30, 2019 and 2018, respectively. The effective tax rate for the three months ended September 30, 2019 was less than the U.S. statutory rate of 21 percent primarily due to certain permanent tax differences related to net income attributable to noncontrolling interests offset by equity compensation and state and local tax expense. The effective tax rate for the nine months ended September 30, 2019 was equal to the U.S. statutory rate of 21 percent primarily due to $36 million of state deferred tax expense recorded as an out of period adjustment, offset by permanent tax differences related to net income attributable to noncontrolling interests. The effective tax rate for the three and nine months ended September 30, 2018 was less than the U.S. statutory rate of 21 percent primarily due to certain permanent tax differences related to net income attributable to noncontrolling interest offset by state and local tax expense. During the first quarter of 2019, MPC’s deferred tax liabilities increased $68 million with an offsetting increase to goodwill and the provision for income taxes of $32 million and $36 million, respectively for an out of period adjustment to correct the tax effects recorded in 2018 related to the Andeavor acquisition. The impact of the adjustment was not material to any previous period. We are continuously undergoing examination of our income tax returns, which have been completed through the 2006 tax year for state returns and the 2008 tax year for our U.S. federal return. As of September 30, 2019, we had $201 million of unrecognized tax benefits. Prior to its spinoff on June 30, 2011, Marathon Petroleum Corporation was included in the Marathon Oil Corporation (“Marathon Oil”) U.S. federal income tax returns for all applicable years. During the third quarter of 2017, Marathon Oil received a notice of Final Partnership Administrative Adjustment (“FPAA”) from the U.S. Internal Revenue Service for taxable year 2010, relating to certain partnership transactions. Marathon Oil filed a U.S. Tax Court petition disputing these adjustments during the fourth quarter of 2017. We received an FPAA for taxable years 2011-2014 for items resulting from this matter and filed a U.S. Tax Court petition for tax years 2011-2014 to dispute these corollary adjustments in the fourth quarter of 2017. In the third quarter of 2019, the U.S. Tax court entered a decision in favor of both Marathon Oil and us for all material items and the U.S. Internal Revenue Service is in the process of preparing the final reports for these tax years. Pursuant to our tax sharing agreement with Marathon Oil, the unrecognized tax benefits related to pre-spinoff operations for which Marathon Oil was the taxpayer remain the responsibility of Marathon Oil and we have indemnified Marathon Oil accordingly. See Note 23 for indemnification information.