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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | As of December 31, 2018, MPLX had no outstanding commodity contracts.
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The impact of MPLX’s derivative instruments on its Consolidated Balance Sheets is summarized below:
(In millions) |  | December 31, 2018 |  | December 31, 2017
Derivative contracts not designated as hedging instruments and their balance sheet location |  | Asset |  | Liability |  | Asset |  | Liability
Commodity contracts(1) |  |  |  |  |  |  |  |
Other current assets /Other current liabilities |  | $ | — |  |  | $ | (7 | ) |  | $ | — |  |  | $ | (14 | )
Other noncurrent assets /Deferred credits and other liabilities |  | — |  |  | (54 | ) |  | — |  |  | (52 | )
Total |  | $ | — |  |  | $ | (61 | ) |  | $ | — |  |  | $ | (66 | )
(1) | Includes embedded derivatives in commodity contracts as discussed above.
Derivative Instruments, Gain (Loss) [Table Text Block] | The impact of MPLX’s derivative contracts not designated as hedging instruments and the location of gains and losses recognized on the Consolidated Statements of Income is summarized below:
|  | December 31,
(In millions) |  | 2018 |  | 2017 |  | 2016
Product sales |  |  |  |  |  |
Realized gains/(losses) |  | $ | 4 |  |  | $ | (9 | ) |  | $ | 2 |
Unrealized gains/(losses) |  | 2 |  |  | 4 |  |  | (15 | )
Total derivative gains/(losses) related to product sales |  | 6 |  |  | (5 | ) |  | (13 | )
Purchased product costs |  |  |  |  |  |
Realized losses |  | (12 | ) |  | (9 | ) |  | (5 | )
Unrealized gains/(losses) |  | 3 |  |  | (10 | ) |  | (22 | )
Total derivative loss related to purchased product costs |  | (9 | ) |  | (19 | ) |  | (27 | )
Cost of revenues |  |  |  |  |  |
Realized losses |  | — |  |  | — |  |  | (3 | )
Unrealized gains |  | — |  |  | — |  |  | 1 |
Total derivative losses related to cost of revenues |  | — |  |  | — |  |  | (2 | )
Total derivative losses |  | $ | (3 | ) |  | $ | (24 | ) |  | $ | (42 | )

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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