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Debt (Tables)
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Outstanding Borrowings Our outstanding borrowings at June 30, 2022 and December 31, 2021 consisted of the following:
(In millions)June 30,
2022		December 31,
2021
Marathon Petroleum Corporation:
Senior notes$6,449 $6,449 
Notes payable1 1 
Finance lease obligations620 589 
Total$7,070 $7,039 
MPLX LP:
Bank revolving credit facility— 300 
Senior notes20,100 18,600 
Finance lease obligations8 9 
Total$20,108 $18,909 
Total debt$27,178 $25,948 
Unamortized debt issuance costs(140)(129)
Unamortized (discount) premium, net(264)(280)
Amounts due within one year(1,087)(571)
Total long-term debt due after one year$25,687 $24,968 
Schedule of Line of Credit Facilities
Available Capacity under our Credit Facilities as of June 30, 2022
(Dollars 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 — %October 2023
MPC trade receivables securitization facility(a)
100 — 100 — — September 2022
MPLX
MPLX bank revolving credit facility3,500 — — 3,500 — %July 2024
(a)    The committed borrowing and letter of credit issuance capacity of 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 June 30, 2022, letters of credit in the total amount of $358 million were issued and outstanding under the facility to secure contracts awarded by the Department of Energy to purchase crude oil from the Strategic Petroleum Reserve. In July 2022, the trade receivables securitization facility was amended to, among other things, extend its term until September 29, 2023.