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Acquisitions (Tables) | 6 Months Ended
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Jun. 30, 2017
Business Acquisition [Line Items] |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] | The following tables present the Partnership’s previously reported unaudited Consolidated Statements of Income for the three and six months ended June 30, 2016, retrospectively adjusted for the acquisition of HST, WHC and MPLXT:
| Three Months Ended June 30, 2016
(In millions, except per unit data) | MPLX LP (Previously Reported) |  | HST/WHC |  | MPLXT |  | Eliminations(1) |  | MPLX LP (Currently Reported)
Revenues and other income: |  |  |  |  |  |  |  |  |
Service revenue | $ | 233 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 233 |
Service revenue - related parties | 145 |  |  | 27 |  |  | 74 |  |  | — |  |  | 246 |
Rental income | 71 |  |  | — |  |  | — |  |  | — |  |  | 71 |
Rental income - related parties | 29 |  |  | 11 |  |  | 26 |  |  | — |  |  | 66 |
Product sales | 137 |  |  | — |  |  | — |  |  | — |  |  | 137 |
Product sales - related parties | 3 |  |  | — |  |  | — |  |  | — |  |  | 3 |
Loss from equity method investments | (83 | ) |  | — |  |  | — |  |  | — |  |  | (83 | )
Other income | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Other income - related parties | 28 |  |  | — |  |  | — |  |  | (4 | ) |  | 24 |
Total revenues and other income | 564 |  |  | 38 |  |  | 100 |  |  | (4 | ) |  | 698 |
Costs and expenses: |  |  |  |  |  |  |  |  |
Cost of revenues (excludes items below) | 84 |  |  | 9 |  |  | 20 |  |  | — |  |  | 113 |
Purchased product costs | 114 |  |  | — |  |  | — |  |  | — |  |  | 114 |
Rental cost of sales | 14 |  |  | 1 |  |  | — |  |  | — |  |  | 15 |
Rental cost of sales - related parties | — |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Purchases - related parties | 78 |  |  | 4 |  |  | 21 |  |  | (4 | ) |  | 99 |
Depreciation and amortization | 137 |  |  | 4 |  |  | 10 |  |  | — |  |  | 151 |
Impairment expense | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
General and administrative expenses | 49 |  |  | 2 |  |  | 12 |  |  | — |  |  | 63 |
Other taxes | 11 |  |  | 1 |  |  | 1 |  |  | — |  |  | 13 |
Total costs and expenses | 488 |  |  | 22 |  |  | 64 |  |  | (4 | ) |  | 570 |
Income from operations | 76 |  |  | 16 |  |  | 36 |  |  | — |  |  | 128 |
Interest expense (net of amounts capitalized) | 52 |  |  | — |  |  | — |  |  | — |  |  | 52 |
Other financial costs | 12 |  |  | — |  |  | — |  |  | — |  |  | 12 |
Income before income taxes | 12 |  |  | 16 |  |  | 36 |  |  | — |  |  | 64 |
Benefit for income taxes | (8 | ) |  | — |  |  | — |  |  | — |  |  | (8 | )
Net income | 20 |  |  | 16 |  |  | 36 |  |  | — |  |  | 72 |
Less: Net income attributable to noncontrolling interests | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Less: Net income attributable to Predecessor | — |  |  | 16 |  |  | 36 |  |  | — |  |  | 52 |
Net income attributable to MPLX LP | 19 |  |  | — |  |  | — |  |  | — |  |  | 19 |
Less: Preferred unit distributions | 9 |  |  | — |  |  | — |  |  | — |  |  | 9 |
Less: General partner’s interest in net income attributable to MPLX LP | 46 |  |  | — |  |  | — |  |  | — |  |  | 46 |
Limited partners’ interest in net loss attributable to MPLX LP | $ | (36 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (36 | )
(1) | Represents intercompany transactions eliminated during the consolidation process, in accordance with GAAP.
| Six Months Ended June 30, 2016
(In millions, except per unit data) | MPLX LP (Previously Reported) |  | HST/WHC |  | MPLXT |  | Eliminations(1) |  | MPLX LP (Currently Reported)
Revenues and other income: |  |  |  |  |  |  |  |  |
Service revenue | $ | 462 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 462 |
Service revenue - related parties | 295 |  |  | 54 |  |  | 74 |  |  | — |  |  | 423 |
Rental income | 141 |  |  | — |  |  | — |  |  | — |  |  | 141 |
Rental income - related parties | 55 |  |  | 23 |  |  | 26 |  |  | — |  |  | 104 |
Product sales | 237 |  |  | — |  |  | — |  |  | — |  |  | 237 |
Product sales - related parties | 6 |  |  | — |  |  | — |  |  | — |  |  | 6 |
Loss from equity method investments | (78 | ) |  | — |  |  | — |  |  | — |  |  | (78 | )
Other income | 3 |  |  | — |  |  | — |  |  | — |  |  | 3 |
Other income - related parties | 52 |  |  | — |  |  | — |  |  | (7 | ) |  | 45 |
Total revenues and other income | 1,173 |  |  | 77 |  |  | 100 |  |  | (7 | ) |  | 1,343 |
Costs and expenses: |  |  |  |  |  |  |  |  |
Cost of revenues (excludes items below) | 173 |  |  | 14 |  |  | 20 |  |  | — |  |  | 207 |
Purchased product costs | 193 |  |  | — |  |  | — |  |  | — |  |  | 193 |
Rental cost of sales | 28 |  |  | 1 |  |  | — |  |  | — |  |  | 29 |
Rental cost of sales - related parties | — |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Purchases - related parties | 154 |  |  | 9 |  |  | 21 |  |  | (7 | ) |  | 177 |
Depreciation and amortization | 269 |  |  | 8 |  |  | 10 |  |  | — |  |  | 287 |
Impairment expense | 130 |  |  | — |  |  | — |  |  | — |  |  | 130 |
General and administrative expenses | 101 |  |  | 3 |  |  | 12 |  |  | — |  |  | 116 |
Other taxes | 22 |  |  | 2 |  |  | 1 |  |  | — |  |  | 25 |
Total costs and expenses | 1,070 |  |  | 38 |  |  | 64 |  |  | (7 | ) |  | 1,165 |
Income from operations | 103 |  |  | 39 |  |  | 36 |  |  | — |  |  | 178 |
Related party interest and other financial income | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Interest expense (net of amounts capitalized) | 107 |  |  | — |  |  | — |  |  | — |  |  | 107 |
Other financial costs | 24 |  |  | — |  |  | — |  |  | — |  |  | 24 |
(Loss) income before income taxes | (29 | ) |  | 39 |  |  | 36 |  |  | — |  |  | 46 |
Benefit for income taxes | (12 | ) |  | — |  |  | — |  |  | — |  |  | (12 | )
Net (loss) income | (17 | ) |  | 39 |  |  | 36 |  |  | — |  |  | 58 |
Less: Net income attributable to noncontrolling interests | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Less: Net income attributable to Predecessor | 23 |  |  | 39 |  |  | 36 |  |  | — |  |  | 98 |
Net loss attributable to MPLX LP | (41 | ) |  | — |  |  | — |  |  | — |  |  | (41 | )
Less: Preferred unit distributions | 9 |  |  | — |  |  | — |  |  | — |  |  | 9 |
Less: General partner’s interest in net income attributable to MPLX LP | 85 |  |  | — |  |  | — |  |  | — |  |  | 85 |
Limited partners’ interest in net loss attributable to MPLX LP | $ | (135 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (135 | )
(1) | Represents intercompany transactions eliminated during the consolidation process, in accordance with GAAP.
The following table presents the Partnership’s previously reported unaudited Consolidated Statements of Cash Flows, retrospectively adjusted for the acquisition of HST, WHC and MPLXT:
| Six Months Ended June 30, 2016
(In millions) | MPLX LP (Previously Reported) |  | HST/WHC |  | MPLXT |  | MPLX LP (Currently Reported)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |
Operating activities: |  |  |  |  |  |  |
Net (loss) income | $ | (17 | ) |  | $ | 39 |  |  | $ | 36 |  |  | $ | 58 |
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |  |  |  |  |  |
Amortization of deferred financing costs | 23 |  |  | — |  |  | — |  |  | 23 |
Depreciation and amortization | 269 |  |  | 8 |  |  | 10 |  |  | 287 |
Impairment expense | 130 |  |  | — |  |  | — |  |  | 130 |
Deferred income taxes | (13 | ) |  | — |  |  | — |  |  | (13 | )
Asset retirement expenditures | (2 | ) |  | — |  |  | — |  |  | (2 | )
Loss from equity method investments | 78 |  |  | — |  |  | — |  |  | 78 |
Distributions from unconsolidated affiliates | 78 |  |  | — |  |  | — |  |  | 78 |
Changes in: |  |  |  |  |  |  |
Current receivables | (20 | ) |  | — |  |  | — |  |  | (20 | )
Inventories | (3 | ) |  | — |  |  | — |  |  | (3 | )
Fair value of derivatives | 25 |  |  | — |  |  | — |  |  | 25 |
Current accounts payable and accrued liabilities | 18 |  |  | (1 | ) |  | 2 |  |  | 19 |
Receivables from / liabilities to related parties | 6 |  |  | — |  |  | (18 | ) |  | (12 | )
All other, net | 21 |  |  | 3 |  |  | (2 | ) |  | 22 |
Net cash provided by operating activities | 593 |  |  | 49 |  |  | 28 |  |  | 670 |
Investing activities: |  |  |  |  |  |  |
Additions to property, plant and equipment | (569 | ) |  | (23 | ) |  | (14 | ) |  | (606 | )
Investments - net related party loans | 77 |  |  | (26 | ) |  | (14 | ) |  | 37 |
Investments in unconsolidated affiliates | (39 | ) |  | — |  |  | — |  |  | (39 | )
All other, net | 5 |  |  | — |  |  | — |  |  | 5 |
Net cash used in investing activities | (526 | ) |  | (49 | ) |  | (28 | ) |  | (603 | )
Financing activities: |  |  |  |  |  |  |
Long-term debt - borrowings | 434 |  |  | — |  |  | — |  |  | 434 |
- repayments | (1,311 | ) |  | — |  |  | — |  |  | (1,311 | )
Related party debt - borrowings | 1,853 |  |  | — |  |  | — |  |  | 1,853 |
- repayments | (1,861 | ) |  | — |  |  | — |  |  | (1,861 | )
Net proceeds from equity offerings | 321 |  |  | — |  |  | — |  |  | 321 |
Issuance of redeemable preferred units | 984 |  |  | — |  |  | — |  |  | 984 |
Distributions to unitholders and general partner | (391 | ) |  | — |  |  | — |  |  | (391 | )
Distributions to noncontrolling interests | (1 | ) |  | — |  |  | — |  |  | (1 | )
Contributions from noncontrolling interests | 2 |  |  | — |  |  | — |  |  | 2 |
All other, net | (1 | ) |  | — |  |  | — |  |  | (1 | )
Distributions to MPC from Predecessor | (104 | ) |  | — |  |  | — |  |  | (104 | )
Net cash used in financing activities | (75 | ) |  | — |  |  | — |  |  | (75 | )
Net decrease in cash and cash equivalents | (8 | ) |  | — |  |  | — |  |  | (8 | )
Cash and cash equivalents at beginning of period | 43 |  |  | — |  |  | — |  |  | 43 |
Cash and cash equivalents at end of period | $ | 35 |  |  | $ | — |  |  | $ | — |  |  | $ | 35 |
Ozark Pipeline [Member] |
Business Acquisition [Line Items] |
Business Acquisition, Pro Forma Information [Table Text Block] | The amounts of revenue and income from operations associated with the acquisition included in the Consolidated Statements of Income, since the March 1, 2017 acquisition date, are as follows:
(In millions) | Three Months Ended June 30, 2017 |  | Four Months Ended June 30, 2017
Revenues and other income | $ | 19 |  |  | $ | 26 |
Income from operations | 9 |  |  | 11 |

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