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Acquisitions Acquisition of HST, WHC & MPLXT - Cash Flow (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net (loss) income | $ 191 | $ 72 | [1] | $ 378 |  | $ 58 | [1] |  |
Adjustments to reconcile net income (loss) to cash provided by operating activities |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  |  | 25 |  | 23 |  |  |
Depreciation and amortization | 164 | 151 |  | 351 |  | 287 |  |  |
Impairment expense | 0 | 1 |  | 0 |  | 130 |  |  |
Deferred income taxes |  |  |  | 1 |  | (13) |  |  |
Asset retirement expenditures |  |  |  | (1) |  | (2) |  |  |
(Income) loss from equity method investments | 1 | (83) |  | 6 | [2] | (78) | [2] |  |
Distributions from unconsolidated affiliates |  |  |  | 66 |  | 78 |  |  |
Changes in: |  |  |  |  |  |  |  |  |
Current receivables |  |  |  | 17 |  | (20) |  |  |
Inventories |  |  |  | (2) |  | (3) |  |  |
Fair value of derivatives |  |  |  | 22 |  | (25) |  |  |
Current accounts payable and accrued liabilities |  |  |  | (16) |  | 19 |  |  |
Receivables from / liabilities to related parties |  |  |  | 22 |  | (12) |  |  |
All other, net |  |  |  | 32 |  | 22 |  |  |
Net cash provided by operating activities |  |  |  | 844 |  | 670 | [3] |  |
Additions to property, plant and equipment | (372) | (302) |  | (652) |  | (606) |  |  |
Investments - net related party loans |  |  |  | 80 |  | 37 |  |  |
Investments in unconsolidated affiliates |  |  |  | 640 |  | 39 |  |  |
All other, net |  |  |  | 1 |  | 5 |  |  |
Net cash used in investing activities |  |  |  | (1,404) |  | (603) | [3] |  |
Long-term debt - borrowings |  |  |  | 2,241 |  | 434 |  |  |
Long-term debt - repayments |  |  |  | (1) |  | (1,311) |  |  |
Related party debt - borrowings |  |  |  | 12 |  | 1,853 |  |  |
Related party debt - repayments |  |  |  | 12 |  | 1,861 |  |  |
Net proceeds from equity offerings |  |  |  | 443 |  | 321 |  |  |
Issuance of redeemable preferred units |  |  |  | 0 |  | 984 |  |  |
Distributions to unitholders and general partner |  |  |  | (505) |  | (391) |  |  |
Distributions to noncontrolling interests |  |  |  | (2) |  | (1) |  |  |
Contributions from noncontrolling interests |  |  |  | 128 |  | 2 |  |  |
All other, net |  |  |  | (7) |  | (1) |  |  |
Net cash provided by (used in) financing activities |  |  |  | 619 |  | (75) |  |  |
Net increase (decrease) in cash and cash equivalents |  |  |  | 59 |  | (8) |  |  |
Cash and cash equivalents | $ 293 | 35 |  | 293 |  | 35 |  | $ 234 | $ 43
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net (loss) income |  | 20 |  |  |  | (17) |  |  |
Adjustments to reconcile net income (loss) to cash provided by operating activities |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  | 23 |  |  |
Depreciation and amortization |  | 137 |  |  |  | 269 |  |  |
Impairment expense |  | 1 |  |  |  | 130 |  |  |
Deferred income taxes |  |  |  |  |  | (13) |  |  |
Asset retirement expenditures |  |  |  |  |  | (2) |  |  |
(Income) loss from equity method investments |  | (83) |  |  |  | (78) |  |  |
Distributions from unconsolidated affiliates |  |  |  |  |  | 78 |  |  |
Changes in: |  |  |  |  |  |  |  |  |
Current receivables |  |  |  |  |  | (20) |  |  |
Inventories |  |  |  |  |  | (3) |  |  |
Fair value of derivatives |  |  |  |  |  | (25) |  |  |
Current accounts payable and accrued liabilities |  |  |  |  |  | 18 |  |  |
Receivables from / liabilities to related parties |  |  |  |  |  | 6 |  |  |
All other, net |  |  |  |  |  | 21 |  |  |
Net cash provided by operating activities |  |  |  |  |  | 593 |  |  |
Additions to property, plant and equipment |  |  |  |  |  | (569) |  |  |
Investments - net related party loans |  |  |  |  |  | 77 |  |  |
Investments in unconsolidated affiliates |  |  |  |  |  | 39 |  |  |
All other, net |  |  |  |  |  | 5 |  |  |
Net cash used in investing activities |  |  |  |  |  | (526) |  |  |
Long-term debt - borrowings |  |  |  |  |  | 434 |  |  |
Long-term debt - repayments |  |  |  |  |  | (1,311) |  |  |
Related party debt - borrowings |  |  |  |  |  | 1,853 |  |  |
Related party debt - repayments |  |  |  |  |  | 1,861 |  |  |
Net proceeds from equity offerings |  |  |  |  |  | 321 |  |  |
Issuance of redeemable preferred units |  |  |  |  |  | 984 |  |  |
Distributions to unitholders and general partner |  |  |  |  |  | (391) |  |  |
Distributions to noncontrolling interests |  |  |  |  |  | (1) |  |  |
Contributions from noncontrolling interests |  |  |  |  |  | 2 |  |  |
All other, net |  |  |  |  |  | (1) |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  | (75) |  |  |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  | (8) |  |  |
Cash and cash equivalents |  | 35 |  |  |  | 35 |  |  | 43
Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net (loss) income |  | 0 |  |  |  | 0 |  |  |
Adjustments to reconcile net income (loss) to cash provided by operating activities |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | 0 |  |  |  | 0 |  |  |
Impairment expense |  | 0 |  |  |  | 0 |  |  |
(Income) loss from equity method investments |  | 0 |  |  |  | 0 |  |  |
HST & WHC [Member] | Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net (loss) income |  | 16 |  |  |  | 39 |  |  |
Adjustments to reconcile net income (loss) to cash provided by operating activities |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  | 0 |  |  |
Depreciation and amortization |  | 4 |  |  |  | 8 |  |  |
Impairment expense |  | 0 |  |  |  | 0 |  |  |
Deferred income taxes |  |  |  |  |  | 0 |  |  |
Asset retirement expenditures |  |  |  |  |  | 0 |  |  |
(Income) loss from equity method investments |  | 0 |  |  |  | 0 |  |  |
Distributions from unconsolidated affiliates |  |  |  |  |  | 0 |  |  |
Changes in: |  |  |  |  |  |  |  |  |
Current receivables |  |  |  |  |  | 0 |  |  |
Inventories |  |  |  |  |  | 0 |  |  |
Fair value of derivatives |  |  |  |  |  | 0 |  |  |
Current accounts payable and accrued liabilities |  |  |  |  |  | (1) |  |  |
Receivables from / liabilities to related parties |  |  |  |  |  | 0 |  |  |
All other, net |  |  |  |  |  | 3 |  |  |
Net cash provided by operating activities |  |  |  |  |  | 49 |  |  |
Additions to property, plant and equipment |  |  |  |  |  | (23) |  |  |
Investments - net related party loans |  |  |  |  |  | (26) |  |  |
Investments in unconsolidated affiliates |  |  |  |  |  | 0 |  |  |
All other, net |  |  |  |  |  | 0 |  |  |
Net cash used in investing activities |  |  |  |  |  | (49) |  |  |
Long-term debt - borrowings |  |  |  |  |  | 0 |  |  |
Long-term debt - repayments |  |  |  |  |  | 0 |  |  |
Related party debt - borrowings |  |  |  |  |  | 0 |  |  |
Related party debt - repayments |  |  |  |  |  | 0 |  |  |
Net proceeds from equity offerings |  |  |  |  |  | 0 |  |  |
Issuance of redeemable preferred units |  |  |  |  |  | 0 |  |  |
Distributions to unitholders and general partner |  |  |  |  |  | 0 |  |  |
Distributions to noncontrolling interests |  |  |  |  |  | 0 |  |  |
Contributions from noncontrolling interests |  |  |  |  |  | 0 |  |  |
All other, net |  |  |  |  |  | 0 |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  | 0 |  |  |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  | 0 |  |  |
Cash and cash equivalents |  | 0 |  |  |  | 0 |  |  | 0
MPLX Terminals [Member] | Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net (loss) income |  | 36 |  |  |  | 36 |  |  |
Adjustments to reconcile net income (loss) to cash provided by operating activities |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  | 0 |  |  |
Depreciation and amortization |  | 10 |  |  |  | 10 |  |  |
Impairment expense |  | 0 |  |  |  | 0 |  |  |
Deferred income taxes |  |  |  |  |  | 0 |  |  |
Asset retirement expenditures |  |  |  |  |  | 0 |  |  |
(Income) loss from equity method investments |  | 0 |  |  |  | 0 |  |  |
Distributions from unconsolidated affiliates |  |  |  |  |  | 0 |  |  |
Changes in: |  |  |  |  |  |  |  |  |
Current receivables |  |  |  |  |  | 0 |  |  |
Inventories |  |  |  |  |  | 0 |  |  |
Fair value of derivatives |  |  |  |  |  | 0 |  |  |
Current accounts payable and accrued liabilities |  |  |  |  |  | 2 |  |  |
Receivables from / liabilities to related parties |  |  |  |  |  | (18) |  |  |
All other, net |  |  |  |  |  | (2) |  |  |
Net cash provided by operating activities |  |  |  |  |  | 28 |  |  |
Additions to property, plant and equipment |  |  |  |  |  | (14) |  |  |
Investments - net related party loans |  |  |  |  |  | (14) |  |  |
Investments in unconsolidated affiliates |  |  |  |  |  | 0 |  |  |
All other, net |  |  |  |  |  | 0 |  |  |
Net cash used in investing activities |  |  |  |  |  | (28) |  |  |
Long-term debt - borrowings |  |  |  |  |  | 0 |  |  |
Long-term debt - repayments |  |  |  |  |  | 0 |  |  |
Related party debt - borrowings |  |  |  |  |  | 0 |  |  |
Related party debt - repayments |  |  |  |  |  | 0 |  |  |
Net proceeds from equity offerings |  |  |  |  |  | 0 |  |  |
Issuance of redeemable preferred units |  |  |  |  |  | 0 |  |  |
Distributions to unitholders and general partner |  |  |  |  |  | 0 |  |  |
Distributions to noncontrolling interests |  |  |  |  |  | 0 |  |  |
Contributions from noncontrolling interests |  |  |  |  |  | 0 |  |  |
All other, net |  |  |  |  |  | 0 |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  | 0 |  |  |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  | 0 |  |  |
Cash and cash equivalents |  | $ 0 |  |  |  | 0 |  |  | $ 0
MPC |  |  |  |  |  |  |  |  |
Changes in: |  |  |  |  |  |  |  |  |
Distributions to MPC from Predecessor |  |  |  | (1,511) |  | 0 |  |  |
MPC | Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |
Changes in: |  |  |  |  |  |  |  |  |
Distributions to MPC from Predecessor |  |  |  |  |  | (104) |  |  |
MPC | Predecessor |  |  |  |  |  |  |  |  |
Changes in: |  |  |  |  |  |  |  |  |
Distributions to MPC from Predecessor |  |  |  | $ (113) |  | (104) |  |  |
MPC | HST & WHC [Member] | Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |
Changes in: |  |  |  |  |  |  |  |  |
Distributions to MPC from Predecessor |  |  |  |  |  | 0 |  |  |
MPC | MPLX Terminals [Member] | Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |
Changes in: |  |  |  |  |  |  |  |  |
Distributions to MPC from Predecessor |  |  |  |  |  | $ 0 |  |  |
[1] | Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.
[2] | Income (loss) from equity method investments includes the impact of any basis differential amortization or accretion.
[3] | Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.

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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the period in the net carrying value of derivative instruments reported as assets and liabilities that are due to be disposed of within one year (or the normal operating cycle, if longer). + References No definition available. + Details
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- Definition The aggregate increase (decrease) during the reporting period in the amount due from the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the issuance of preferred limited partners units during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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