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)	[2]	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, 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
Contributions from noncontrolling interests		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

[1] Financial information for the first quarter of 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.

[2] Financial information for the first quarter of 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.