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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