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Master Limited Partnerships (Tables)
 12 Months Ended
Dec. 31, 2018
Noncontrolling Interest [Abstract]  
Noncontrolling Interest
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 interest in MPLX and ANDX were as follows:
(In millions)
2018
 
2017
 
2016
Increase (decrease) due to the issuance of MPLX & ANDX common units to the public
$
6

 
$
25

 
$
(60
)
Increase due to the issuance of MPLX & ANDX common units and general partner units to MPC
1,114

 
114

 
121

Increase due to GP/IDR Exchange
1,808

 
—

 
—

Increase in MPC's additional paid-in capital
2,928

 
139

 
61

Tax impact
(571
)
 
(29
)
 
(118
)
Increase (decrease) in MPC's additional paid-in capital, net of tax
$
2,357

 
$
110

 
$
(57
)