Debt (Tables)

9 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Outstanding Borrowings

Our outstanding borrowings at September 30, 2023 and December 31, 2022 consisted of the following:

(Millions of dollars)	September 30, 2023		December 31, 2022
Marathon Petroleum Corporation:
Senior notes	$	6,449	$	6,449
Notes payable	1		1
Finance lease obligations	476		522
Total	6,926		6,972
MPLX LP:
Senior notes	20,700		20,100
Finance lease obligations	7		8
Total	20,707		20,108
Total debt	27,633		27,080
Unamortized debt issuance costs	(145)		(142)
Unamortized discount, net of unamortized premium	(206)		(238)
Amounts due within one year	(819)		(1,066)
Total long-term debt due after one year	$	26,463	$	25,634

Schedule of Line of Credit Facilities

Available Capacity under our Credit Facilities as of September 30, 2023

(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 2024
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. In September 2023, the trade receivables securitization facility was amended to, among other things, extend its term until September 30, 2024.