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Debt (Tables)
9 Months Ended
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— 
Finance lease obligations494 464 
Total6,193 6,914 
MPLX LP:
Senior notes22,350 20,700 
Finance lease obligations
Total22,356 20,706 
Total debt28,549 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 $— $$4,999 — %July 2027
MPC trade receivables securitization facility(a)
100 — — 100 — %September 2027
MPLX
MPLX bank revolving credit facility2,000 — — 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.