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Revenue ASC 606 Initial Application Period Cumulative Effect (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  | $ 5,007 |  |  |  |
Rental income |  |  |  |  |  |  |  |  |  |  | 349 |  | $ 277 |  | $ 298
Inventories |  | $ 77 |  |  |  | $ 65 |  |  |  |  | 77 |  | 65 |  |
Long-term deferred revenue |  | 80 |  |  |  | 42 |  |  |  |  | 80 |  | 42 |  |
Long-term deferred revenue - related parties |  | 43 |  |  |  | 43 |  |  |  |  | 43 |  | 43 |  |
Property, plant and equipment, net |  | 14,639 |  |  |  | 12,187 |  |  |  |  | 14,639 |  | 12,187 |  |
Deferred revenue - related parties |  | 51 |  |  |  | 43 |  |  |  |  | 51 |  | 43 |  |
Total MPLX LP partners’ capital |  | 6,708 |  |  |  | 9,827 |  |  |  |  | 6,708 |  | 9,827 |  |
Rental cost of sales |  |  |  |  |  |  |  |  |  |  | 135 |  | 62 |  | 57
Depreciation and amortization | [1] |  |  |  |  |  |  |  |  |  | 766 |  | 683 |  | 591
Net income |  | 439 | $ 516 | $ 456 | $ 423 | 241 |  | $ 217 | $ 191 | $ 187 | 1,834 |  | 836 |  | 434
Other income |  |  |  |  |  |  |  |  |  |  | 7 |  | 6 |  | 7
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract with Customer, Asset, Gross |  | 4 |  |  |  | 4 | [2] |  |  |  | 4 |  | 4 | [2] |
Long-term deferred revenue |  | 10 |  |  |  | 5 | [2] |  |  |  | 10 |  | 5 | [2] |
Long-term deferred revenue - related parties |  | 42 |  |  |  | 43 | [2] |  |  |  | 42 |  | 43 | [2] |
Deferred Revenue, Current |  | 4 |  |  |  | 5 | [2] |  |  |  | 4 |  | 5 | [2] |
Deferred revenue - related parties |  | 50 |  |  |  | 42 | [2] |  |  |  | 50 |  | 42 | [2] |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  |  |  | 284 |  |  |  |
Rental cost of sales |  |  |  |  |  |  |  |  |  |  | 70 |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 767 |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 1,832 |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  |  |  | 65 |  |  |  |
Rental cost of sales |  |  |  |  |  |  |  |  |  |  | 65 |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Cumulative Adjusted 606 Balance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  | 66 |  |  |  |  |  |  | 66 |  |
Long-term deferred revenue |  |  |  |  |  | 39 |  |  |  |  |  |  | 39 |  |
Property, plant and equipment, net |  |  |  |  |  | 12,184 |  |  |  |  |  |  | 12,184 |  |
Inventories [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | 2 |  |  |  | 1 |  |  |  |  | 2 |  | 1 |  |
Property, Plant and Equipment [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | (3) |  |  |  |  |  |  | (3) |  |
Deferred Revenue, Noncurrent [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | (3) |  |  |  |  |  |  | (3) |  |
Public | Limited Partners Common Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total MPLX LP partners’ capital |  | $ 8,336 |  |  |  | 8,379 |  |  |  |  | 8,336 |  | 8,379 |  |
Public | Limited Partners Common Units | Cumulative Adjusted 606 Balance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total MPLX LP partners’ capital |  |  |  |  |  | 8,380 |  |  |  |  |  |  | 8,380 |  |
Public | Limited Partners Common Units | Equity [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | $ 1 |  |  |  |  |  |  | 1 |  |
Service [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  | 1,704 |  | 1,156 |  | 958
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties |  |  |  |  |  |  |  |  |  |  | 2,159 |  | 1,082 |  | 936
Service [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  | 1,342 |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties |  |  |  |  |  |  |  |  |  |  | 2,166 |  |  |  |
Service [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  | 362 |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties |  |  |  |  |  |  |  |  |  |  | (7) |  |  |  |
Service, Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  | 198 |  | 0 |  | 0
Service, Other [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Service, Other [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  | 198 |  |  |  |
Product [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  | 902 |  | 889 |  | 572
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue | [3] |  |  |  |  |  |  |  |  |  | 897 |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties |  |  |  |  |  |  |  |  |  |  | 49 |  | 8 |  | 11
Product [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue |  |  |  |  |  |  |  |  |  |  | 982 |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties |  |  |  |  |  |  |  |  |  |  | 42 |  |  |  |
Product [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue |  |  |  |  |  |  |  |  |  |  | (85) |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |
Oil and Gas, Refining and Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  | 948 | [4] | 528 |  | 454
Oil and Gas, Refining and Marketing [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold | [4] |  |  |  |  |  |  |  |  |  | 579 |  |  |  |
Oil and Gas, Refining and Marketing [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold | [4] |  |  |  |  |  |  |  |  |  | 369 |  |  |  |
Natural Gas, Midstream [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  | 845 |  | $ 651 |  | $ 448
Natural Gas, Midstream [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  | 740 |  |  |  |
Natural Gas, Midstream [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  | 105 |  |  |  |
Other Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income | [5] |  |  |  |  |  |  |  |  |  | $ 1,418 |  |  |  |
[1] | Depreciation and amortization attributable to L&S was $240 million, $163 million and $128 million for the years ended 2018, 2017 and 2016, respectively. Depreciation and amortization attributable to G&P was $526 million, $520 million and $463 million for 2018, 2017 and 2016, respectively.
[2] | Balance represents ASC 606 portion of each respective line item.
[3] | 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.
[4] | Excludes “Purchased product costs,” “Rental cost of sales,” “Purchases,” “Depreciation and amortization,” “General and administrative expenses,” and “Other taxes.”
[5] | Non-ASC 606 Revenue includes rental income, income from equity method investments, derivative gains and losses, mark-to-market adjustments, and other income.

X
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- Definition The carrying amount of consideration received or receivable from related parties as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income. + References No definition available. + Details
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- Definition Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
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