v3.26.3
Debt (Tables)
 9 Months Ended
Sep. 30, 2026
Debt Disclosure [Abstract]  
Outstanding Borrowings
Our outstanding borrowings at September 30, 2026 and December 31, 2025 consisted of the following:
(In millions)September 30,
2026		December 31,
2025
MPC:
Senior notes$5,700 $6,449 
MARAD debt147 161 
Finance lease obligations640 689 
Total6,487 7,299 
MPLX:
Senior notes27,000 26,000 
Finance lease obligations5 6 
Total27,005 26,006 
Total debt33,492 33,305 
Unamortized debt issuance costs(221)(204)
Unamortized discount, net of unamortized premium(249)(225)
Amounts due within one year(128)(2,371)
Total long-term debt due after one year$32,894 $30,505 
Schedule of Line of Credit Facilities
Capacity under our Credit Facilities as of September 30, 2026
(In millions)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 — %April 2031
MPC trade receivables securitization facility(a)
100 — 100 — — %April 2029
MPLX
MPLX bank revolving credit facility2,500 — — 2,500 — %April 2031
(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 borrowings and the issuance of letters of credit in excess of the committed capacity at the discretion of the issuing banks. As of September 30, 2026, letters of credit in the total amount of $1.63 billion 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.