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Debt
 6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Debt DEBT
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



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.
MPC 364-Day Bank Revolving Credit Facility
On July 26, 2019, we entered into a new $1 billion 364-day revolving credit facility with a syndicate of banks that will, subject to the satisfaction of customary conditions, become effective upon the expiration of our existing $1 billion 364-day revolving credit facility in September 2019. The new 364-day revolving credit facility contains substantially the same terms and conditions as our existing 364-day revolving credit facility and will expire in September 2020.
MPC Trade Receivables Securitization Facility
On July 19, 2019, we amended our $750 million trade receivables securitization facility to extend the maturity date to July 16, 2021.
MPLX Credit Agreement
Upon the completion of the merger of MPLX and ANDX on July 30, 2019, the MPLX bank revolving credit facility was amended and restated to increase the borrowing capacity to $3.5 billion and to extend the maturity date to July 30, 2024. The ANDX revolving and dropdown credit facilities were terminated and all outstanding balances were repaid and funded with the new $3.5 billion bank revolving credit facility.