Consolidated Statements of Equity - USD ($)		Total	Preferred Class B [Member]		Public Limited Partners Common Units	MPC Limited Partners Common Units		Accumulated Other Comprehensive Loss		Noncontrolling Interests	Equity of Predecessor MPC
Beginning Balance at Dec. 31, 2018		$ 17,731,000,000	$ 0		$ 8,336,000,000	$ (1,612,000,000)		$ (16,000,000)		$ 156,000,000	$ 10,867,000,000
Distributions to:	[1]	(669,000,000)	0		176,000,000	307,000,000		0		(6,000,000)	(180,000,000)
Contributions from:	[1]	15,000,000	0		0	0		0		0	15,000,000
Unitholders and general partner	[1]	(776,000,000)	0		(188,000,000)	(327,000,000)		0		0	(261,000,000)
Noncontrolling interests	[1]	(6,000,000)	0		0	0		0		(6,000,000)	0
Contributions from noncontrolling interests	[1]	(94,000,000)	0		0	0		0		(94,000,000)	0
Other	[1]	3,000,000	0		2,000,000	0		1,000,000		0	0
Ending Balance at Mar. 31, 2019	[1]	17,730,000,000	0		8,326,000,000	(1,632,000,000)		(15,000,000)		250,000,000	10,801,000,000
Beginning Balance at Dec. 31, 2018		17,731,000,000	0		8,336,000,000	(1,612,000,000)		(16,000,000)		156,000,000	10,867,000,000
Contributions from noncontrolling interests	[2]	(94,000,000)
Ending Balance at Jun. 30, 2019		17,611,000,000	0		8,305,000,000	(1,671,000,000)		(15,000,000)		250,000,000	10,742,000,000
Beginning Balance at Mar. 31, 2019	[1]	17,730,000,000	0		8,326,000,000	(1,632,000,000)		(15,000,000)		250,000,000	10,801,000,000
Distributions to:		(636,000,000)	0	[1]	168,000,000	293,000,000		0	[1]	(6,000,000)	(169,000,000)
Contributions from:		13,000,000	0	[1]	0	0	[1]	0	[1]	0	13,000,000
Unitholders and general partner		(764,000,000)	0	[1]	(191,000,000)	(332,000,000)		0	[1]	0	241,000,000
Noncontrolling interests		(6,000,000)	0	[1]	0	0		0		(6,000,000)	0	[1]
Other		2,000,000	0	[1]	2,000,000	0		0		0	0
Ending Balance at Jun. 30, 2019		17,611,000,000	0		8,305,000,000	(1,671,000,000)		(15,000,000)		250,000,000	10,742,000,000
Beginning Balance at Dec. 31, 2019		16,613,000,000	611,000,000		10,800,000,000	4,968,000,000		(15,000,000)		249,000,000	0
Distributions to:		2,736,000,000	(11,000,000)		(1,022,000,000)	(1,733,000,000)		0		(8,000,000)	0
Contributions from:		225,000,000	0		0	225,000,000		0		0	0
Unitholders and general partner		(738,000,000)	(21,000,000)		(271,000,000)	(446,000,000)		0		0	0
Noncontrolling interests		(9,000,000)	0		0	0		0		(9,000,000)	0
Other		1,000,000	0		2,000,000	0		(1,000,000)		0	0
Ending Balance at Mar. 31, 2020		13,356,000,000	601,000,000		9,509,000,000	3,014,000,000		(16,000,000)		248,000,000	0
Beginning Balance at Dec. 31, 2019		16,613,000,000	611,000,000		10,800,000,000	4,968,000,000		(15,000,000)		249,000,000	0
Unitholders and general partner			(21,000,000)
Contributions from noncontrolling interests		0
Ending Balance at Jun. 30, 2020		13,262,000,000	611,000,000		9,469,000,000	2,951,000,000		(16,000,000)		247,000,000	0
Beginning Balance at Mar. 31, 2020		13,356,000,000	601,000,000		9,509,000,000	3,014,000,000		(16,000,000)		248,000,000	0
Distributions to:		(634,000,000)	(10,000,000)		229,000,000	388,000,000		0		(7,000,000)	0
Contributions from:		6,000,000	0		0	6,000,000		0		0	0
Unitholders and general partner		(728,000,000)	0		(270,000,000)	(458,000,000)		0		0	0
Noncontrolling interests		(8,000,000)	0		0	0		0		(8,000,000)	0
Other		2,000,000	0		1,000,000	1,000,000		0		0	0
Ending Balance at Jun. 30, 2020		$ 13,262,000,000	$ 611,000,000		$ 9,469,000,000	$ 2,951,000,000		$ (16,000,000)		$ 247,000,000	$ 0

[1] Financial information for the first and second quarters of 2019 has been retrospectively adjusted for the acquisition of ANDX.

[2] Financial information for the six months ended June 30, 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.