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Master Limited Partnership (Tables)
 9 Months Ended
Sep. 30, 2019
Noncontrolling Interest [Abstract]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
As a result of equity transactions of MPLX and ANDX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX and ANDX were as follows:
 
Nine Months Ended 
September 30,
(In millions)
2019
 
2018
Increase due to the issuance of MPLX common units and general partner units to MPC
$
—

 
$
1,114

Increase due to GP/IDR Exchange
—

 
1,808

Increase (decrease) due to the issuance of MPLX & ANDX common units
(52
)
 
6

Increase (decrease) in MPC's additional paid-in capital
(52
)
 
2,928

Tax impact
(634
)
 
(546
)
Increase (decrease) in MPC's additional paid-in capital, net of tax
$
(686
)
 
$
2,382