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Spin-Off (Details) (USD $) In Millions, except Share data, unless otherwise specified			12 Months Ended
	Jun. 30, 2011 independent_energy_company	Jun. 27, 2011	Dec. 31, 2011 Spinoff [Member]
Spin Off Disclosure [Abstract]
Number of Independent Energy Companies	2
Number of Common Shares Received of MPC		1
Number of Common Shares of Marathon Stock Owned		2
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues applicable to discontinued operations			$ 38,602
Pretax income from discontinued operations			$ 2,012

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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