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Commitments and Contingencies - Other Lawsuits (Details) - Pending Litigation $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Construction Work at MarkWest Processing and Fractionation Complexes | Minimum
Loss Contingencies [Line Items]
Damages sought	$ 40
Construction Work at MarkWest Processing and Fractionation Complexes | Minimum | MPLX LP
Loss Contingencies [Line Items]
Damages sought	$ 10
Emergency Pricing And Consumer Protection Laws
Loss Contingencies [Line Items]
Plaintiff	Commonwealth of Kentucky
Damages sought	$ 89
Loss contingency, period of occurrence	during September and October 2005

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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