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Master Limited Partnership (Redemption of the Series B Preferred Units) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Feb. 15, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Noncontrolling Interest [Line Items]
Redemption of noncontrolling interests - preferred units				$ 0	$ 600
Redemption of preferred units		$ 0	$ 0	$ 0	$ 2
MPLX | Series B Preferred Stock
Noncontrolling Interest [Line Items]
Preferred units, outstanding	600,000
Preferred units, redemption price per unit	$ 1,000
Redemption of noncontrolling interests - preferred units	$ 600
Redemption of preferred units	$ 2

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The cash outflow to reacquire preferred stock during the period.

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-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
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The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period.

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-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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-Topic 505
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The number of preferred units outstanding.

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