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Revenue Revenue (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Revenue, Initial Application Period Cumulative Effect Transition [Table Text Block] | The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASC 606 was as follows:
(In millions) | Balance at December 31, 2017 |  | ASC 606 Adjustment |  | Balance at January 1, 2018
Assets |  |  |  |  |
Inventories | $ | 65 |  |  | $ | 1 |  |  | $ | 66 |
Property, plant and equipment, net | 12,187 |  |  | (3 | ) |  | 12,184 |
Liabilities |  |  |  |  |
Long-term deferred revenue | 42 |  |  | (3 | ) |  | 39 |
Equity |  |  |  |  |
Common unitholders - public | $ | 8,379 |  |  | $ | 1 |  |  | $ | 8,380 |
Aside from the adjustments to the opening balances noted above, the impact of adoption on the Consolidated Balance Sheets for the year ended December 31, 2018 was approximately a $2 million adjustment to “Inventories.” The disclosure of the impact of adoption on the Consolidated Statements of Income for the year ended December 31, 2018 was as follows:
| December 31, 2018
(In millions) | ASC 606 Balance |  | ASC 605 Balance |  | Effect of Change Higher/ (Lower)
Revenues and other income: |  |  |  |  |
Service revenue | $ | 1,704 |  |  | $ | 1,342 |  |  | $ | 362 |
Service revenue - related parties | 2,159 |  |  | 2,166 |  |  | (7 | )
Service revenue - product related | 198 |  |  | — |  |  | 198 |
Rental income | 349 |  |  | 284 |  |  | 65 |
Product sales(1) | 897 |  |  | 982 |  |  | (85 | )
Product sales - related parties | 49 |  |  | 42 |  |  | 7 |
Costs and expenses: |  |  |  |  |
Cost of revenues(2) | 948 |  |  | 579 |  |  | 369 |
Purchased product costs | 845 |  |  | 740 |  |  | 105 |
Rental cost of sales | 135 |  |  | 70 |  |  | 65 |
Depreciation and amortization | 766 |  |  | 767 |  |  | (1 | )
Net income | $ | 1,834 |  |  | $ | 1,832 |  |  | $ | 2 |
(1) | G&P “Product sales” for the year ended December 31, 2018 excludes approximately $5 million of impact related to derivative gains and mark-to-market adjustments.
(2) | Excludes “Purchased product costs,” “Rental cost of sales,” “Purchases,” “Depreciation and amortization,” “General and administrative expenses,” and “Other taxes.”
Disaggregation of Revenue [Table Text Block] | The following table represents a disaggregation of revenue for each reportable segment for the year ended December 31, 2018:
| December 31, 2018
(In millions) | L&S |  | G&P |  | Total
Revenues and other income: |  |  |  |  |
Service revenue | $ | 130 |  |  | $ | 1,574 |  |  | $ | 1,704 |
Service revenue - related parties | 2,159 |  |  | — |  |  | 2,159 |
Service revenue - product related | — |  |  | 198 |  |  | 198 |
Product sales(1) | 7 |  |  | 890 |  |  | 897 |
Product sales - related parties | 7 |  |  | 42 |  |  | 49 |
Total revenues from contracts with customers | $ | 2,303 |  |  | $ | 2,704 |  |  | 5,007 |
Non-ASC 606 revenue(2) |  |  |  |  | 1,418 |
Total revenues and other income |  |  |  |  | $ | 6,425 |
(1) | G&P “Product sales” for the year ended December 31, 2018 excludes approximately $5 million of impact related to derivative gains and mark-to-market adjustments.
(2) | Non-ASC 606 Revenue includes rental income, income from equity method investments, derivative gains and losses, mark-to-market adjustments, and other income.
Contract with Customer, Asset and Liability [Table Text Block] | The table below reflects the changes in our contract balances for the year ended December 31, 2018:
(In millions) | Balance at January 1, 2018(1) |  | Additions/ (Deletions) |  | Revenue Recognized(2) |  | Balance at December 31, 2018
Contract assets | $ | 4 |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |
Deferred revenue | 5 |  |  | 8 |  |  | (9 | ) |  | 4 |
Deferred revenue - related parties | 42 |  |  | 40 |  |  | (32 | ) |  | 50 |
Long-term deferred revenue | 5 |  |  | 5 |  |  | — |  |  | 10 |
Long-term deferred revenue - related parties | $ | 43 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | 42 |
(1) | Balance represents ASC 606 portion of each respective line item.
(2) | $1 million revenue was recognized related to past performance obligations in the current year.
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] | The table below includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period. As of December 31, 2018, the amounts allocated to contract assets and contract liabilities on the Consolidated Balance Sheets are $105 million and are reflected in the amounts below. This will be recognized as revenue as the obligations are satisfied, which is expected to occur over the next 25 years. Further, MPLX does not disclose variable consideration due to volume variability in the table below.
(In millions) |
2019 | $ | 1,146 |
2020 | 1,152 |
2021 | 1,166 |
2022 | 1,151 |
2023 and thereafter | 5,524 |
Total revenue on remaining performance obligations(1)(2)(3) | $ | 10,139 |
(1) | All fixed consideration from contracts with customers is included in the amounts presented above. Variable consideration that is constrained or not required to be estimated as it reflects our efforts to perform is excluded.
(2) | Arrangements deemed implicit leases are included in “Rental income” and are excluded from this table.
(3) | Only minimum volume commitments that are deemed fixed are included in the table above. MPLX has various minimum volume commitments in processing arrangements that vary based on the actual Btu content of the gas received. These amounts are deemed variable consideration and are excluded from the table above.

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