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Master Limited Partnership (Noncontrolling Interest) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 30, 2019
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Increase in MPC's additional paid-in capital, net of tax   $ 6 $ (7) $ 1 $ 2    
Additional Paid-in Capital              
Increase due to the issuance of MPLX & ANDX common units           $ 4 $ 7
Tax impact $ (642)         (1) (2)
Increase in MPC's additional paid-in capital, net of tax $ (55) $ 8 $ (5) $ 2 $ 3 $ 3 $ 5