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Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Outstanding Borrowings

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

(In millions)	September 30, 2019				December 31, 2018
Marathon Petroleum Corporation	$	9,174			$	9,114
MPLX LP	20,120				13,856
ANDX(a)	—				5,010
Total debt	$	29,294			$	27,980
Unamortized debt issuance costs	(137		)		(128		)
Unamortized discount	(318		)		(328		)
Amounts due within one year	(557		)		(544		)
Total long-term debt due after one year	$	28,282			$	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 2020
MPC bank revolving credit facility		5,000				—				1				4,999				—			October 2023
MPC trade receivables securitization facility		750				—				—				750				—			July 2021
MPLX bank revolving credit facility		3,500				—				3				3,497				—			July 2024
MPLX term loan facility		1,000				500				—				500				2.795	%		September 2021

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