Debt (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Outstanding Borrowings

Our outstanding borrowings at June 30, 2019 and December 31, 2018 consisted of the following:

(In millions)	June 30, 2019			December 31, 2018
Marathon Petroleum Corporation	$	9,119		$	9,114
MPLX LP	14,473			13,856
ANDX LP	5,263			5,010
Total debt	$	28,855		$	27,980
Unamortized debt issuance costs	(124		)	(128		)
Unamortized discount	(324		)	(328		)
Amounts due within one year	(554		)	(544		)
Total long-term debt due after one year	$	27,853		$	26,980

Schedule of Line of Credit Facilities [Table Text Block]

Available Capacity under our Facilities

(Dollars in millions)	Total Capacity		Outstanding Borrowings		Outstanding Letters of Credit		Available Capacity		Weighted Average Interest Rate		Expiration
MPC 364-day bank revolving credit facility	$	1,000	$	—	$	—	$	1,000	—		September 2019
MPC bank revolving credit facility	5,000		—		32		4,968		—		October 2023
MPC trade receivables securitization facility	750		—		—		750		—		July 2019
MPLX bank revolving credit facility	2,250		615		3		1,632		3.80	%	July 2022
ANDX revolving & dropdown credit facilities(a)	2,100		1,500		—		600		3.90	%	January 2021
	$	11,100	$	2,115	$	35	$	8,950

^(a) 

Western Refining Southwest, Inc., a wholly-owned subsidiary of MPC and unitholder of ANDX, has guaranteed certain outstanding borrowings under the ANDX dropdown credit facility that were made in connection with the August 2018 dropdown transaction.