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MPLX LP (Tables)
 3 Months Ended
Mar. 31, 2017
Noncontrolling Interest [Abstract]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block]
Changes in MPC’s equity and the offsetting changes to noncontrolling interest resulting from changes in MPC’s and the noncontrolling interest’s ownership interests in MPLX were as follows:
 
Three Months Ended 
 March 31,
(In millions)
2017
 
2016
Transfers (to) from noncontrolling interest
 
 
 
Increase (decrease) in MPC's additional paid in capital for the issuance of MPLX LP common units to the public
$
10

 
$
(40
)
Increase in MPC's additional paid in capital for the issuance of MPLX LP common units and general partner units to MPC
96

 
—

Net transfers (to) from noncontrolling interests
106

 
(40
)
Tax impact
(34
)
 
(65
)
Change in MPC's additional paid-in capital, net of tax
$
72

 
$
(105
)