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Master Limited Partnership - Noncontrolling Interest in MLPs (Details) - USD ($) $ 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
Increase (decrease) in MPC's additional paid-in capital, net of tax |  | $ (596) | $ 1 | $ 2 | $ 0 | $ 0 | $ (546) |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |
Increase due to the issuance of MPLX common units and general partner units to MPC |  |  |  |  |  |  |  | $ 0 | $ 1,114
Increase due to GP/IDR Exchange |  |  |  |  |  |  |  | 0 | 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 | $ (642) |  |  |  |  |  |  | (634) | (546)
Increase (decrease) in MPC's additional paid-in capital, net of tax | $ (55) | $ (691) | $ 2 | $ 3 | $ 1 | $ 1 | $ 2,380 | $ (686) | $ 2,382

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- Definition Consolidation, Less that Wholly Owned Subsidiary, Parent Ownership Interest, Changes, GP IDR Buy-In + References No definition available. + Details
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- Definition Deferred income tax impact from changes in equity + References No definition available. + Details
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- Definition Represents a (noncash) issuance of additional equity interests to the parent by a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The additional equity interest represented by this element increases the parent's controlling interest in the subsidiary. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591554-111686 + Details
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- Definition Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 + Details
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- Definition The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591554-111686 + Details
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