Equity (Tables)

6 Months Ended

Jun. 30, 2017

Schedule of Stockholders Equity [Table Text Block]

The changes in the number of units outstanding during the six months ended June 30, 2017 are summarized below:



(In units)	Common	Class B⁽¹⁾	General Partner	Total
Balance at December 31, 2016	357,193,288	3,990,878	7,371,105	368,555,271
Unit-based compensation awards⁽²⁾	168,622	—	3,441	172,063
Issuance of units under the ATM Program⁽³⁾	12,662,663	—	258,422	12,921,085
Contribution of HST/WHC/MPLXT⁽⁴⁾	12,960,376	—	264,497	13,224,873
Balance at June 30, 2017	382,984,949	3,990,878	7,897,465	394,873,292


(1)	On July 1, 2017, 3,990,878 Class B units converted to 4,350,057 common units and will be eligible to receive the second quarter 2017 distribution.


(2)	As a result of the unit-based compensation awards issued during the period, MPLX GP contributed less than $1 million in exchange for 3,441 general partner units to maintain its two percent GP Interest.


(3)	As a result of common units issued under the ATM Program during the period, MPLX GP contributed $9 million in exchange for 258,422 general partner units to maintain its two percent GP Interest.


(4)	See Note 3 for information regarding the HST, WHC and MPLXT acquisition.

Schedule Of Calculation Of Net Income Applicable to Partners [Table Text Block]

Net Income Allocation – In preparing the Consolidated Statements of Equity, net income (loss) attributable to MPLX LP is allocated to Preferred unitholders based on a fixed distribution schedule, as discussed in Note 8, and subsequently allocated to the general partner and limited partner unitholders. However, when distributions related to the incentive distribution rights are made, earnings equal to the amount of those distributions are first allocated to the general partner before the remaining earnings are allocated to the unitholders, based on their respective ownership percentages. The following table presents the allocation of the general partner’s GP Interest in net income attributable to MPLX LP:



	Three Months Ended June 30,					Six Months Ended June 30,
(In millions)	2017		2016			2017		2016
Net income (loss) attributable to MPLX LP	$	190	$	19		$	340	$	(41	)
Less: Preferred unit distributions	17		9			33		9
General partner's incentive distribution rights and other	72		47			133		88
Net income (loss) attributable to MPLX LP available to general and limited partners	$	101	$	(37	)	$	174	$	(138	)

General partner's two percent GP Interest in net income (loss) attributable to MPLX LP	$	2	$	(1	)	$	3	$	(3	)
General partner's incentive distribution rights and other	72		47			133		88
General partner's GP Interest in net income attributable to MPLX LP	$	74	$	46		$	136	$	85

Distributions Made to Limited Partner, by Distribution [Table Text Block]

The allocation of total quarterly cash distributions to general, limited and Preferred unitholders is as follows for the three and six months ended June 30, 2017 and 2016. The Partnership’s distributions are declared subsequent to quarter end; therefore, the following table represents total cash distributions applicable to the period in which the distributions were earned.



	Three Months Ended June 30,				Six Months Ended June 30,
(In millions)	2017		2016		2017		2016
General partner's distributions:
General partner's distributions on general partner units	$	6	$	4	$	11	$	8
General partner's distributions on incentive distribution rights	70		46		130		86
Total distribution on general partner units and incentive distribution rights	$	76	$	50	$	141	$	94
Common and preferred unit distributions:
Common unitholders, includes common units of general partner	$	218	$	172	$	416	$	328
Preferred unit distributions	17		9		33		9
Total cash distributions declared	$	311	$	231	$	590	$	431