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Related Party Agreements and Transactions MPC Loan Agreement (Details) - Related Party Revolving Credit Agreement [Member] - MPC Investment [Member] - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Jul. 31, 2019
Apr. 27, 2018
Sep. 30, 2020
Dec. 31, 2019
Dec. 21, 2018
Related Party Transaction [Line Items]          
Line of Credit Facility, Current Borrowing Capacity $ 1,500        
Debt Instrument, Description of Variable Rate Basis LIBOR plus 1.25 percent LIBOR plus 1.50 percent      
Proceeds from Lines of Credit     $ 4,870 $ 8,540  
Line of Credit Facility, Interest Rate During Period     2.38% 3.441%  
Repayments of Lines of Credit     $ 5,464 $ 7,946  
Long-term Line of Credit [1]     $ 0 594  
ANDX LP [Member]          
Related Party Transaction [Line Items]          
Line of Credit Facility, Current Borrowing Capacity         $ 500
Proceeds from Lines of Credit       $ 773  
Line of Credit Facility, Interest Rate During Period       4.249%  
Repayments of Lines of Credit       $ 773  
Long-term Line of Credit [1]       $ 0  
[1]
Included in “Current liabilities - related parties” on the Consolidated Balance Sheets.