Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Sales-type lease revenue		$ 36	$ 34	$ 73	$ 68
Sales-type lease revenue - related parties		116	120	231	241
Income from equity method investments		170	325	356	482
Total revenues and other income		3,003	3,052	6,127	5,898
Cost of revenues (excludes items below)		369	384	758	755
Purchased product costs		432	376	891	745
Purchases - related parties		422	388	838	760
Depreciation and amortization	[1]	324	320	650	637
General and administrative expenses		107	107	219	216
Other taxes		32	33	65	67
Total costs and expenses		1,710	1,633	3,468	3,228
Income from operations		1,293	1,419	2,659	2,670
Net interest and other financial costs		234	231	463	466
Income before income taxes		1,059	1,188	2,196	2,204
Provision for income taxes		1	2	2	3
Net income		1,058	1,186	2,194	2,201
Less: Net income attributable to noncontrolling interests		10	10	20	20
Net income attributable to MPLX LP	[2]	1,048	1,176	2,174	2,181
Dividends, Preferred Stock		0	5	0	15
Limited partners' interest in net income attributable to MPLX LP		$ 1,048	$ 1,171	$ 2,174	$ 2,166
Net income attributable to MPLX LP per limited partner unit:
Common - basic		$ 1.03	$ 1.15	$ 2.13	$ 2.13
Common - diluted		$ 1.03	$ 1.15	$ 2.13	$ 2.13
Weighted average limited partner units outstanding:
Common - basic		1,020	1,019	1,020	1,013
Common - diluted		1,021	1,020	1,020	1,014
Nonrelated Party [Member]
Rental income		$ 64	$ 64	$ 128	$ 124
Other Income		5	6	15	51
Rental cost of sales		20	20	39	39
Related Party [Member]
Rental income		216	211	427	428
Other Income		40	37	81	77
Rental cost of sales		4	5	8	9
Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax - Third parties		696	683	1,403	1,341
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		1,093	1,050	2,159	2,036
Service, Other [Member]
Revenue from Contract with Customer, Excluding Assessed Tax - Third parties		70	84	169	179
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax - Third parties		472	388	985	758
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		$ 25	$ 50	$ 100	$ 113

[1] Depreciation and amortization attributable to Crude Oil and Products Logistics was $135 million and $268 million for the three and six months ended June 30, 2025, respectively, and $131 million and $261 million for the three and six months ended June 30, 2024, respectively. Depreciation and amortization attributable to Natural Gas and NGL Services was $189 million and $382 million for the three and six months ended June 30, 2025, respectively, and $189 million and $376 million for the three and six months ended June 30, 2024, respectively.

[2] Allocation of net income attributable to MPLX LP assumes all earnings for the period have been distributed based on the distribution priorities applicable to the period.