Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Sales-type lease revenue		$ 34	$ 34	$ 102	$ 101
Sales-type lease revenue - related parties		118	129	359	379
Income from equity method investments		149	159	631	438
Total revenues and other income		2,972	2,912	8,870	8,315
Purchases - related parties		402	442	1,162	1,160
Depreciation and amortization	[1]	322	301	959	907
General and administrative expenses		107	102	323	280
Other taxes		32	44	99	102
Total costs and expenses		1,697	1,758	4,925	4,790
Income from operations		1,275	1,154	3,945	3,525
Net interest and other financial costs		226	225	692	701
Income before income taxes		1,049	929	3,253	2,824
Provision for income taxes		2	1	5	2
Net income		1,047	928	3,248	2,822
Less: Net income attributable to noncontrolling interests		10	10	30	28
Net income attributable to MPLX LP	[2]	1,037	918	3,218	2,794
Limited partners' interest in net income attributable to MPLX LP		$ 1,031	$ 893	$ 3,197	$ 2,718
Net income attributable to MPLX LP per limited partner unit:
Common - basic		$ 1.01	$ 0.89	$ 3.14	$ 2.70
Common - diluted		$ 1.01	$ 0.89	$ 3.14	$ 2.70
Weighted average limited partner units outstanding:
Common - basic		1,020	1,001	1,016	1,001
Common - diluted		1,020	1,001	1,016	1,001
Nonrelated Party [Member]
Rental income		$ 63	$ 61	$ 187	$ 181
Other Income		7	7	58	28
Rental cost of sales		22	20	61	60
Related Party [Member]
Rental income		216	207	644	612
Other Income		40	32	117	90
Rental cost of sales		5	8	14	24
General and administrative expenses		73	72	217	197
Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax - Third parties		709	641	2,050	1,881
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		1,066	1,038	3,102	2,962
Service, Other [Member]
Revenue from Contract with Customer, Excluding Assessed Tax - Third parties		86	75	265	214
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax - Third parties		433	478	1,191	1,274
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties		51	51	164	155
Natural Gas, Midstream [Member]
Purchased product costs		403	474	1,148	1,234
Oil and Gas Service
Cost of revenues (excludes items below)		404	367	1,159	1,023
Series A Preferred Stock [Member]
Dividends, Preferred Stock		6	25	21	71
Series B Preferred Stock [Member]
Dividends, Preferred Stock		$ 0	$ 0	$ 0	$ 5

[1] Depreciation and amortization attributable to L&S was $132 million and $393 million for the three and nine months ended September 30, 2024, respectively, and $130 million and $399 million for the three and nine months ended September 30, 2023, respectively. Depreciation and amortization attributable to G&P was $190 million and $566 million for the three and nine months ended September 30, 2024, respectively, and $171 million and $508 million for the three and nine months ended September 30, 2023, 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.