Investments and Noncontrolling Interests (Tables)

3 Months Ended

Mar. 31, 2026

Equity Method Investments and Joint Ventures [Abstract]

The following table presents MPLX’s equity method investments at the dates indicated:


		Ownership as of	Carrying value at
		March 31,	March 31,		December 31,
(In millions, except ownership percentages)	VIE	2026	2026		2025
Crude Oil and Products Logistics
Illinois Extension Pipeline Company, L.L.C.		35%	$	219	$	208
LOOP LLC		41%	314		313
MarEn Bakken Company LLC(1)		25%	495		502
Other(2)	X	17 - 67%	554		558
Total Crude Oil and Products Logistics			1,582		1,581
Natural Gas and NGL Services
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C.	X	67%	398		407
MarkWest Utica EMG, L.L.C.	X	62%	933		890
Ohio Gathering Company L.L.C.(3)	X	32%	432		444
Sherwood Midstream LLC	X	50%	472		475
MXP Parent, LLC		10%	223		198
Texas City Logistics LLC	X	50%	228		163
WPC Parent, LLC		30%	269		273
Other(2)	X	10 - 51%	444		367
Total Natural Gas and NGL Services			3,399		3,217
Total			$	4,981	$	4,798

(1) The investment in MarEn Bakken Company LLC includes our 9.19 percent indirect interest in a joint venture (“Dakota Access”) that owns and operates the Dakota Access Pipeline and Energy Transfer Crude Oil Pipeline projects (collectively, the “Bakken Pipeline system”).

(2) Included within Other are certain equity method investments that have been deemed to be VIEs.

(3) MPLX also holds a 42 percent indirect interest in Ohio Gathering Company L.L.C. through our ownership interest in MarkWest Utica EMG, L.L.C.