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Consolidated Statements of Equity and Series A Preferred Units (Consolidated Statements of Equity) - USD ($) $ in Millions	Total	Common Unit-holders Public	Common Unit-holder MPC	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Beginning Balance at Dec. 31, 2023	$ 12,689	$ 8,700	$ 3,758	$ (4)	$ 235
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,005	355	640	0	10
Unit repurchases	(75)	(75)	0	0	0
Conversion of Series A preferred units	321	321	0	0	0
Distributions	(864)	(303)	(550)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(11)
Contributions	10	0	10	0	0
Other	0	(1)	0	1	0
Ending Balance at Mar. 31, 2024	13,086	8,997	3,858	(3)	234
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,181	425	746	0	10
Unit repurchases	(75)	(75)	0	0	0
Conversion of Series A preferred units	354	354	0	0	0
Distributions	(875)	(314)	(550)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(11)
Contributions	8	0	8	0	0
Other	5	5	0	0	0
Ending Balance at Jun. 30, 2024	13,684	9,392	4,062	(3)	233
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,041	377	654	0	10
Unit repurchases	(76)	(76)	0	0	0
Distributions	(879)	(317)	(551)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(11)
Contributions	7	0	7	0	0
Other	2	2	0	0	0
Ending Balance at Sep. 30, 2024	13,779	9,378	4,172	(3)	232
Beginning Balance at Dec. 31, 2024	13,807	9,322	4,257	(3)	231
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,136	410	716	0	10
Unit repurchases	(100)	(100)	0	0	0
Conversion of Series A preferred units	197	197	0	0	0
Distributions	(983)	(353)	(619)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(11)
Contributions	7	0	7	0	0
Other	4	(4)	0	8	0
Ending Balance at Mar. 31, 2025	14,068	9,472	4,361	5	230
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,058	384	664	0	10
Unit repurchases	(100)	(100)	0	0	0
Distributions	(987)	(357)	(619)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(11)
Contributions	7	0	7	0	0
Other	3	3	0	0	0
Ending Balance at Jun. 30, 2025	14,049	9,402	4,413	5	229
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,555	563	982	0	10
Unit repurchases	(100)	(100)	0	0	0
Distributions	(986)	(355)	(620)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(11)
Contributions	2	0	2	0	0
Other	4	3	1	0	0
Ending Balance at Sep. 30, 2025	$ 14,524	$ 9,513	$ 4,778	$ 5	$ 228

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest and excluding the portion attributable to temporary equity.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Total contributions made by each class of partners (i.e., general, limited and preferred partners).

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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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