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Debt (Tables) | 9 Months Ended
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Sep. 30, 2024
Debt Disclosure [Abstract] |
Outstanding Borrowings | Our outstanding borrowings at September 30, 2024 and December 31, 2023 consisted of the following:
(Millions of dollars) | September 30, 2024 |  | December 31, 2023
Marathon Petroleum Corporation: |  |  |
Senior notes | $ | 5,699 |  |  | $ | 6,449 |
Notes payable | — |  |  | 1 |
Finance lease obligations | 494 |  |  | 464 |
Total | 6,193 |  |  | 6,914 |
MPLX LP: |  |  |
Senior notes | 22,350 |  |  | 20,700 |
Finance lease obligations | 6 |  |  | 6 |
Total | 22,356 |  |  | 20,706 |
Total debt | 28,549 |  |  | 27,620 |
Unamortized debt issuance costs | (146) |  |  | (141) |
Unamortized discount, net of unamortized premium | (183) |  |  | (196) |
Amounts due within one year | (4,167) |  |  | (1,954) |
Total long-term debt due after one year | $ | 24,053 |  |  | $ | 25,329 |
Schedule of Line of Credit Facilities | Available Capacity under our Credit Facilities as of September 30, 2024
(Millions of dollars) |  | Total Capacity |  | Outstanding Borrowings |  | Outstanding Letters of Credit |  | Available Capacity |  | Weighted Average Interest Rate |  | Expiration
MPC, excluding MPLX |  |  |  |  |  |  |  |  |  |  |  |
MPC bank revolving credit facility |  | $ | 5,000 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 4,999 |  |  | — | % |  | July 2027
MPC trade receivables securitization facility(a) |  | 100 |  |  | — |  |  | — |  |  | 100 |  |  | — | % |  | September 2027
MPLX |  |  |  |  |  |  |  |  |  |  |  |
MPLX bank revolving credit facility |  | 2,000 |  |  | — |  |  | — |  |  | 2,000 |  |  | — | % |  | July 2027
(a) 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.

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