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Debt - Available Capacity under our Facilities (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
MPC 364-day bank revolving credit facility  
Debt Instrument [Line Items]  
Total Capacity $ 1,000
Outstanding Borrowings 0
Outstanding Letters of Credit 0
Available Capacity $ 1,000
Weighted Average Interest Rate 0.00%
MPC bank revolving credit facility  
Debt Instrument [Line Items]  
Total Capacity $ 5,000
Outstanding Borrowings 2,000 [1]
Outstanding Letters of Credit 1
Available Capacity $ 2,999
Weighted Average Interest Rate 1.89%
Borrowings $ 2,000
MPC trade receivables securitization facility  
Debt Instrument [Line Items]  
Total Capacity 750
Outstanding Borrowings 0 [2],[3]
Outstanding Letters of Credit 0
Available Capacity $ 750
Weighted Average Interest Rate 0.00%
Borrowings $ 925
Repayments 925
MPLX bank revolving credit facility  
Debt Instrument [Line Items]  
Total Capacity 3,500
Outstanding Borrowings 750 [4]
Outstanding Letters of Credit 0
Available Capacity $ 2,750
Weighted Average Interest Rate 1.94%
Borrowings $ 1,325
Repayments $ 575
Weighted average interest rate over time 2.14%
[1]
Borrowed $2 billion on March 30, 2020.
[2]
Borrowed $925 million and repaid $925 million during the three months ended March 31, 2020.
[3] 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
[4] 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