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MPLX LP (Tables) | 3 Months Ended
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Mar. 31, 2018
Noncontrolling Interest [Abstract] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net | As a result of equity transactions of MPLX, 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 were as follows:
| Three Months Ended March 31,
(In millions) | 2018 |  | 2017
Increase due to the issuance of MPLX LP common units to the public | $ | 4 |  |  | $ | 10 |
Increase due to the issuance of MPLX LP common units and general partner units to MPC | 1,114 |  |  | 96 |
Increase due to GP/IDR Exchange | 1,808 |  |  | — |
Increase in MPC's additional paid-in capital | 2,926 |  |  | 106 |
Tax impact | (546 | ) |  | (34 | )
Increase in MPC's additional paid-in capital, net of tax | $ | 2,380 |  |  | $ | 72 |

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- Definition The tabular disclosure of the effects of any changes in a parent's ownership interest in a subsidiary on the equity attributable to the parent if the ownership interests in a subsidiary changes during the period. The changes represented by this element did not result in the deconsolidation of the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591554-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- References No definition available. + Details
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