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Subsequent Events (Tables)
3 Months Ended
May 05, 2020
Mar. 31, 2020
Subsequent Event [Line Items]    
Schedule of Line of Credit Facilities [Table Text Block]  

Available Capacity under our Facilities as of March 31, 2020
(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(a)
 
5,000

 
2,000

 
1

 
2,999

 
1.89
%
 
October 2023
MPC trade receivables securitization facility(b)
 
750

 

 

 
750

 

 
July 2021
MPLX bank revolving credit facility(c)
 
3,500

 
750

 

 
2,750

 
1.94
%
 
July 2024

(a) 
Borrowed $2 billion on March 30, 2020.
(b) 
Borrowed $925 million and repaid $925 million during the three months ended March 31, 2020.
(c) 
Borrowed $1.325 billion at an average interest rate of 2.14 percent and repaid $575 million during the three months ended March 31, 2020.
Subsequent Event    
Subsequent Event [Line Items]    
Schedule of Line of Credit Facilities [Table Text Block]
The following table shows our available credit capacity, excluding MPLX, as of May 5, 2020.
(Dollars in millions)
 
Total
Capacity
 
Outstanding
Borrowings
 
Outstanding
Letters
of Credit
 
Available
Capacity
 
Expiration
MPC 364-day bank revolving credit facility
 
$
1,000

 
$

 
$

 
$
1,000

 
September 2020
MPC 364-day bank revolving credit facility
 
1,000

 

 

 
1,000

 
April 2021
MPC bank revolving credit facility(a)
 
5,000

 
750

 
1

 
4,249

 
October 2023
MPC trade receivables securitization facility(b)
 
517

 

 

 
517

 
July 2021
Available capacity, excluding MPLX, as of May 5, 2020
 
 
 
 
 
 
 
6,766

 
 
(a) 
Borrowed $2 billion on March 30, 2020 and $1.5 billion in April. Repaid $2.75 billion in May.
(b) 
Availability under our $750 million trade receivables facility is a function of eligible trade receivables, which will be lower in a sustained lower price environment for refined products. As of April 30, 2020 eligible trade receivables supported borrowings of approximately $517 million.