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Select Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Financial Data



		2018																2017
(In millions, except per unit data)		1st Qtr.				2nd Qtr.				3rd Qtr.				4th Qtr.				1st Qtr.				2nd Qtr.				3rd Qtr.				4th Qtr.
Total revenues and other income		$	1,420			$	1,578			$	1,712			$	1,715			$	886			$	916			$	980			$	1,085
Income from operations		557				608				672				666				265				280				311				335
Net income		423				456				516				439				187				191				217				241
Net income attributable to MPLX LP		421				453				510				434				150				190				216				238
Net income attributable to MPLX LP per limited partner unit:
Common - basic		0.61				0.55				0.62				0.52				0.20				0.26				0.29				0.31
Common - diluted		0.61				0.55				0.62				0.52				0.19				0.26				0.29				0.31
Subordinated - basic and diluted		—				—				—				—				—				—				—				—
Cash distributions declared per limited partner common unit		0.6175				0.6275				0.6375				0.6475				0.5400				0.5625				0.5875				0.6075
Distributions declared:
Limited partner units - Public		179				181				185				187				149				162				170				175
Limited partner units - MPC		288				316				322				327				49				56				62				171
General partner units - MPC		—				—				—				—				5				6				7				—
IDRs - MPC		—				—				—				—				60				70				81				—
Redeemable preferred units		16				20				19				20				16				17				16				16
Total distributions declared		$	483			$	517			$	526			$	534			$	279			$	311			$	336			$	362