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Master Limited Partnership (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 30, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Equity transactions of MPLX & ANDX |  | $ (596) | $ 1 | $ 2 | $ 0 | $ 0 | $ (546) |  |
Preferred Partner | Preferred Class B |  |  |  |  |  |  |  |  |
Distribution declared, per unit | $ 68.75 |  |  |  |  |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |
Equity transactions of MPLX & ANDX | $ (55) | $ (691) | $ 2 | $ 3 | $ 1 | $ 1 | $ 2,380 | $ (686) | $ 2,382
Deferred income tax impact from changes in equity | $ (642) |  |  |  |  |  |  | $ (634) | $ (546)
Public |  |  |  |  |  |  |  |  |
Common units conversion ratio | 1.135 |  |  |  |  |  |  |  |
Nonpublic |  |  |  |  |  |  |  |  |
Common units conversion ratio | 1.0328 |  |  |  |  |  |  |  |
MPLX |  |  |  |  |  |  |  |  |
MPC's partnership interest in MLP (in percentage) |  | 63.00% |  |  |  |  |  | 63.00% |
MPLX | Series B Preferred Stock |  |  |  |  |  |  |  |  |
Preferred units, outstanding | 600,000 |  |  |  |  |  |  |  |
ANDX |  |  |  |  |  |  |  |  |
Preferred units, outstanding | 600,000 |  |  |  |  |  |  |  |

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