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Master Limited Partnership - Noncontrolling Interest in MLPs (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
	Jul. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Increase (decrease) in MPC's additional paid-in capital, net of tax		$ (596)	$ 1	$ 2	$ 0	$ 0	$ (546)
Additional Paid-in Capital
Increase due to the issuance of MPLX common units and general partner units to MPC								$ 0	$ 1,114
Increase due to GP/IDR Exchange								0	1,808
Increase (decrease) due to the issuance of MPLX & ANDX common units								(52)	6
Increase (decrease) in MPC's additional paid-in capital								(52)	2,928
Tax impact	$ (642)							(634)	(546)
Increase (decrease) in MPC's additional paid-in capital, net of tax	$ (55)	$ (691)	$ 2	$ 3	$ 1	$ 1	$ 2,380	$ (686)	$ 2,382

X

- Definition

Consolidation, Less that Wholly Owned Subsidiary, Parent Ownership Interest, Changes, GP IDR Buy-In

+ References

No definition available.

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- Definition

Deferred income tax impact from changes in equity

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- Definition

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- Definition

Represents a (noncash) issuance of additional equity interests to the parent by a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The additional equity interest represented by this element increases the parent's controlling interest in the subsidiary.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-Section 50
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- Definition

Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent.

+ References

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- Definition

The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements.

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