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Debt (Available Capacity under our Facilities) (Details) $ in Millions	Jun. 30, 2022 USD ($)
MPC revolving credit facility due October 2023
Debt Instrument [Line Items]
Total Capacity	$ 5,000
Outstanding Borrowings	0
Outstanding Letters of Credit	1
Available Capacity	$ 4,999
Weighted Average Interest Rate	0.00%
Maximum borrowing capacity	$ 5,000
MPC trade receivables securitization facility
Debt Instrument [Line Items]
Total Capacity	100	[1]
Outstanding Borrowings	0
Outstanding Letters of Credit	100
Available Capacity	$ 0
Weighted Average Interest Rate	0.00%
Maximum borrowing capacity	$ 100
MPC trade receivables securitization facility | Purchase crude oil from Strategic Petroleum Reserve
Debt Instrument [Line Items]
Outstanding Letters of Credit	358
MPLX LP | MPLX bank revolving credit facility due July 2024
Debt Instrument [Line Items]
Total Capacity	3,500
Outstanding Borrowings	0
Outstanding Letters of Credit	0
Available Capacity	$ 3,500
Weighted Average Interest Rate	0.00%
Maximum borrowing capacity	$ 3,500
[1] The committed borrowing and letter of credit issuance capacity of the trade receivables securitization facility is $100 million. In addition, the facility allows for the issuance of letters of credit in excess of the committed capacity at the discretion of the issuing banks. As of June 30, 2022, letters of credit in the total amount of $358 million were issued and outstanding under the facility to secure contracts awarded by the Department of Energy to purchase crude oil from the Strategic Petroleum Reserve. In July 2022, the trade receivables securitization facility was amended to, among other things, extend its term until September 29, 2023.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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