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Net Income (Loss) Per Limited Partner Unit (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Net Income Per Limited Partner Unit

Potential common units omitted from the diluted earnings per unit calculation for the years ended December 31, 2018, 2017 and 2016 were less than 1 million.



(In millions)		2018				2017				2016
Net income attributable to MPLX LP		$	1,818			$	794			$	233
Less: Limited partners’ distributions declared on preferred units⁽¹⁾		75				65				41
General partner’s distributions declared (includes IDRs)⁽¹⁾⁽²⁾		—				328				205
Limited partners’ distributions declared on common units (including common units of general partner)⁽¹⁾		1,985				895				692
Undistributed net loss attributable to MPLX LP		$	(242	)		$	(494	)		$	(705	)


(1)	See Note 8 for distribution information.


(2)	Distributions declared on January 25, 2018 on general partner common units issued on February 1, 2018 in exchange for the economic general partner interest, including IDRs, are shown as general partner distributions declared.

Schedule of Basic and Diluted Earnings Per Unit



		2018
(In millions, except per unit data)		Limited Partners’ Common Units				Redeemable Preferred Units				Total
Basic and diluted net income attributable to MPLX LP per unit:
Net income attributable to MPLX LP:
Distributions declared		$	1,985			$	75			$	2,060
Undistributed net loss attributable to MPLX LP		(242		)		—				(242		)
Net income attributable to MPLX LP⁽¹⁾		$	1,743			$	75			$	1,818
Weighted average units outstanding:
Basic		761								761
Diluted		761								761
Net income attributable to MPLX LP per limited partner unit:
Basic		$	2.29
Diluted		$	2.29



		2017
(In millions, except per unit data)		General Partner				Limited Partners’ Common Units				Redeemable Preferred Units				Total
Basic and diluted net income attributable to MPLX LP per unit:
Net income attributable to MPLX LP:
Distributions declared (including IDRs)		$	328			$	895			$	65			$	1,288
Undistributed net loss attributable to MPLX LP		(10		)		(484		)		—				(494		)
Net income attributable to MPLX LP⁽¹⁾		$	318			$	411			$	65			$	794
Weighted average units outstanding:
Basic		8				385								393
Diluted		8				388								396
Net income attributable to MPLX LP per limited partner unit:
Basic						$	1.07
Diluted						$	1.06



		2016
(In millions, except per unit data)		General Partner				Limited Partners’ Common Units				Redeemable Preferred Units				Total
Basic and diluted net income attributable to MPLX LP per unit:
Net income attributable to MPLX LP:
Distribution declared		$	205			$	692			$	41			$	938
Undistributed net loss attributable to MPLX LP		(14		)		(691		)		—				(705		)
Net income attributable to MPLX LP⁽¹⁾		$	191			$	1			$	41			$	233
Weighted average units outstanding:
Basic		7				331								338
Diluted		7				338								345
Net income attributable to MPLX LP per limited partner unit:
Basic						$	—
Diluted						$	—


(1)	Allocation of net income/(loss) attributable to MPLX LP assumes all earnings for the period were distributed based on the current period distribution priorities.