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Debt (Available Capacity under our Facilities) (Details) - USD ($) $ in Millions | Apr. 30, 2026 | Apr. 07, 2026 | Mar. 31, 2026
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MPC bank revolving credit facility due July 2027 |  |  |  |
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%
MPC trade receivables securitization facility due September 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Capacity | [1] |  |  | $ 100
Outstanding Borrowings |  |  |  | 0
Outstanding Letters of Credit | [1] |  |  | 100
Available Capacity |  |  |  | $ 0
Weighted Average Interest Rate |  |  |  | 0.00%
Maximum borrowing capacity |  |  |  | $ 100
MPC trade receivables securitization facility due September 2027 | Purchase crude oil from Strategic Petroleum Reserve |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Letters of Credit |  |  |  | 726
MPC Revolving Credit Facility due April 2031 | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | $ 5,000 |
MPC Revolving Credit Facility due April 2031 | Letter of Credit | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | 2,000 |
MPC Revolving Credit Facility due April 2031 | Swing-line Loan | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | 300 |
Trade Receivables Securitization due April 2029 | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Capacity | [1] | $ 100 |  |
Trade Receivables Securitization due April 2029 | Uncommitted Amount | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available Capacity | [1] | $ 1,900 |  |
MPLX LP | MPLX bank revolving credit facility due July 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Capacity |  |  |  | 2,000
Outstanding Borrowings |  |  |  | 0
Outstanding Letters of Credit |  |  |  | 0
Available Capacity |  |  |  | $ 2,000
Weighted Average Interest Rate |  |  |  | 0.00%
Maximum borrowing capacity |  |  |  | $ 2,000
MPLX LP | MPLX Revolving Credit Facility Due April 2031 | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | 2,500 |
MPLX LP | MPLX Revolving Credit Facility Due April 2031 | Letter of Credit | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | 150 |
MPLX LP | MPLX Revolving Credit Facility Due April 2031 | Swing-line Loan | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | $ 150 |
[1] | The committed borrowing and letter of credit issuance capacity under 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 March 31, 2026, letters of credit in the total amount of $726 million were issued and outstanding under the facility to secure contracts awarded by the U.S. Department of Energy to purchase crude oil from the SPR.

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