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Acquisitions Refining Logistics & Fuels Distribution (Details) bbl in Millions, $ in Millions				2 Months Ended	3 Months Ended
		Feb. 01, 2018 USD ($) Tank shares bbl	Mar. 01, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 USD ($) shares	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Contribution from MPC					$ 1,046.0		$ 12.0
Units acquired | shares	[1]				113,888,889
Number of storage tanks | Tank		619
Property, plant and equipment, net				$ 13,291.0	$ 13,291.0			$ 12,187.0
Goodwill				2,460.0	$ 2,460.0			$ 2,245.0
Number of rail and truck racks		32
Number of docks and gasoline blenders		18
Refining Logistics & Fuels Distribution
Business Acquisition [Line Items]
Payments to acquire businesses, gross		$ 4,100.0
Revenues and other income				265.0
Income from operations				$ 181.0
Equity interest issued or issuable, fair value assigned		4,300.0
Total consideration, fair value assigned		8,400.0
Property, plant and equipment, net		830.0
Refining Logistics [Member]
Business Acquisition [Line Items]
Goodwill		85.0
Fuels Distribution [Member]
Business Acquisition [Line Items]
Goodwill		$ 130.0
Limited Partners Common Units
Business Acquisition [Line Items]
Units acquired | shares	[1]				111,611,111
General Partner Units
Business Acquisition [Line Items]
Units acquired | shares	[1]				2,277,778
General Partner Common Units | Refining Logistics & Fuels Distribution
Business Acquisition [Line Items]
Units acquired | shares	[1]	85,610,278
MPLX LP | Limited Partners Common Units | Refining Logistics & Fuels Distribution
Business Acquisition [Line Items]
Units acquired | shares	[1]	111,611,111
MPLX LP | General Partner Units | Refining Logistics & Fuels Distribution
Business Acquisition [Line Items]
Units acquired | shares	[1]	2,277,778
MPLX Logistics LLC | Limited Partners Common Units | Refining Logistics & Fuels Distribution
Business Acquisition [Line Items]
Units acquired | shares	[1]	18,176,666
MPLX Holdings Inc | Limited Partners Common Units | Refining Logistics & Fuels Distribution
Business Acquisition [Line Items]
Units acquired | shares	[1]	7,824,167
MPC
Business Acquisition [Line Items]
Contribution from MPC			$ 6.0			$ 10.0
MPC | Refining Logistics & Fuels Distribution
Business Acquisition [Line Items]
Contribution from MPC					$ 23.7
Crude Oil [Member]
Business Acquisition [Line Items]
Storage Capacity | bbl		56
[1] MPC agreed to waive approximately one-third of the first quarter 2018 distributions on the common units issued in connection with this transaction. As a result of this waiver, MPC will not receive $23.7 million of the distributions that would have otherwise accrued on such common units with respect to the first quarter 2018. See Note 4 for information regarding this acquisition.

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