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Acquisitions (Acquisition of MarEn Bakken) (Details)
bbl / d in Thousands, $ in Millions

11 Months Ended

12 Months Ended

Feb. 15, 2017

USD ($)

Quarterly_reporting_period

bbl / d

Dec. 31, 2017

USD ($)

Dec. 31, 2018

USD ($)

Dec. 31, 2017

USD ($)

Dec. 31, 2016

USD ($)

Schedule of Equity Method Investments [Line Items]

Payments to acquire equity method investments

$ 341.0

$ 761.0

$ 87.0

Income/(loss) from equity method investments

^[1],[2]

240.0

$ 78.0

$ (74.0)

MPC

Schedule of Equity Method Investments [Line Items]

Incentive distribution rights forfeited per quarter

$ 1.6

Number of quarters IDRs forfeited | Quarterly_reporting_period

12

Prorated incentive distribution rights forfeited

$ 0.8

MarEn Bakken

Schedule of Equity Method Investments [Line Items]

Payments to acquire equity method investments

$ 2,000.0

MarEn Bakken

Schedule of Equity Method Investments [Line Items]

Barrels Handled | bbl / d

520

Payments to acquire equity method investments

$ 500.0

Percentage of ownership interest in joint venture acquired

25.00%

Income/(loss) from equity method investments

$ 15.0

$ 48.0

Bakken Pipeline System

Schedule of Equity Method Investments [Line Items]

Percentage of ownership interest in joint venture acquired

37.00%

Equity method investment, ownership percentage

9.00%

[1]	Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.
[2]	“Income/(loss) from equity method investments” includes the impact of any basis differential amortization or accretion.

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