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Revenue (Details) $ in Millions	Jun. 30, 2025 USD ($)
Revenue from Contract with Customer [Abstract]
Matching buy/sell receivables	$ 4,270

X

- Definition

Carrying amounts due as of the balance sheet date of the amounts receivable from matching buy/sell transactions.

+ References

No definition available.

+ Details

Name:	mpc_MatchingBuySellReceivables
Namespace Prefix:	mpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration