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Debt (Tables)
 12 Months Ended
Dec. 31, 2024
Debt Instrument [Line Items]  
Outstanding Borrowings
Our outstanding borrowings at December 31, 2024 and 2023 consisted of the following:
(Millions of dollars)December 31,
2024		December 31,
2023
Marathon Petroleum Corporation:
Senior notes$5,699 $6,449 
Notes payable— 1 
MARAD debt174 — 
Finance lease obligations718 464 
Total6,591 6,914 
MPLX LP:
Senior notes21,200 20,700 
Finance lease obligations6 6 
Total21,206 20,706 
Total debt27,797 27,620 
Unamortized debt issuance costs(142)(141)
Unamortized discount, net of unamortized premium(174)(196)
Amounts due within one year(3,049)(1,954)
Total long-term debt due after one year$24,432 $25,329 
Schedule Of Debt Payments
Principal maturities of long-term debt, excluding finance lease obligations, as of December 31, 2024 for the next five years are as follows:
(Millions of dollars)
2025$2,964 
20262,263 
20272,014 
20281,764 
2029764 
Schedule of Line of Credit Facilities
(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 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.
Marathon Petroleum Corporation | Senior Notes  
Debt Instrument [Line Items]  
Outstanding Borrowings
MPC Senior Notes
 December 31,
(Millions of dollars)20242023
Senior notes, 3.625% due September 2024— 750 
Senior notes, 4.700% due May 20251,250 1,250 
Senior notes, 5.125% due December 2026719 719 
Senior notes, 3.800% due April 2028496 496 
Senior notes, 6.500% due March 20411,250 1,250 
Senior notes, 4.750% due September 2044800 800 
Senior notes, 5.850% due December 2045250 250 
Senior notes, 4.500% due April 2048498 498 
Andeavor senior notes, 3.800% - 5.125% due 2026 – 204836 36 
Senior notes, 5.000%, due September 2054400 400 
Total$5,699 $6,449 
MPLX | Senior Notes  
Debt Instrument [Line Items]  
Outstanding Borrowings
 December 31,
(Millions of dollars)20242023
Senior notes, 4.875% due December 2024$— $1,149 
Senior notes, 4.000% due February 2025500 500 
Senior notes, 4.875% due June 20251,189 1,189 
MarkWest senior notes, 4.875% due 2024 – 202511 12 
Senior notes, 1.750% due March 20261,500 1,500 
Senior notes, 4.125% due March 20271,250 1,250 
Senior notes, 4.250% due December 2027732 732 
Senior notes, 4.000% due March 20281,250 1,250 
Senior notes, 4.800% due February 2029750 750 
Senior notes, 2.650% due August 20301,500 1,500 
Senior notes, 4.950% due September 20321,000 1,000 
Senior notes, 5.000% due March 20331,100 1,100 
Senior notes, 5.500% due June 20341,650 — 
Senior notes, 4.500% due April 20381,750 1,750 
Senior notes, 5.200% due March 20471,000 1,000 
Senior notes, 5.200% due December 2047487 487 
ANDX senior notes, 4.250% - 5.200% due 2027 – 204731 31 
Senior notes, 4.700% due April 20481,500 1,500 
Senior notes, 5.500% due February 20491,500 1,500 
Senior notes, 4.950% due March 20521,500 1,500 
Senior notes, 5.650% due March 2053500 500 
Senior notes, 4.900% due April 2058500 500 
Total$21,200 $20,700