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Variable Interest Entities (Details) bbl / d in Thousands, $ in Millions | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2017 bbl / d
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Equity method investments | $ 4,817 | $ 4,787 |
Crowley Coastal Partners |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE, maximum loss exposure, amount | $ 487 |  |
MarkWest Utica EMG |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments, ownership percentage | 56.00% |  |
Equity method investments | $ 2,100 |  |
Ohio Gathering |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments, ownership percentage | 34.00% |  |
Sherwood Midstream |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments, ownership percentage | 50.00% |  |
Equity method investments | $ 260 |  |
Ohio Fractionation |  |  |
Variable Interest Entity [Line Items] |  |  |
Capacity | bbl / d |  |  | 20
Sherwood Midstream Holdings |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments, ownership percentage | 81.00% |  |
Equity method investments | $ 151 |  |
Sherwood Midstream Holdings | Direct Ownership Interest |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments, ownership percentage |  |  | 79.00%
Sherwood Midstream Holdings | Indirect Ownership Interest |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments, ownership percentage |  |  | 10.50%

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685 + Details
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