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Segment Information - Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures (Detail) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 15, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items] |  |  |  |
Capital expenditures and investments | [1] |  | $ 1,325 | $ 684
Plus items not allocated to segments: |  |  |  |
Capital expenditures | [2] |  | 759 | 475
MarkWest | Adjustments |  |  |  |
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items] |  |  |  |
Less: Investments in equity method investees |  |  |  | 143
MarEn Bakken |  |  |  |
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items] |  |  |  |
Less: Investments in equity method investees |  | $ 500 |  |
Operating Segments |  |  |  |
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items] |  |  |  |
Capital expenditures and investments | [3] |  | 1,297 | 643
Less: Investments in equity method investees | [4] |  | 566 | 209
Corporate and Other |  |  |  |
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items] |  |  |  |
Capital expenditures and investments | [5] |  | 28 | 41
Plus items not allocated to segments: |  |  |  |
Corporate and Other |  |  | 16 | 24
Capitalized interest |  |  | $ 12 | $ 17
[1] | Capital expenditures include changes in capital accruals, acquisitions and investments in affiliates.
[2] | Capital expenditures include changes in capital accruals. See Note 17 for a reconciliation of total capital expenditures to additions to property, plant and equipment as reported in the consolidated statements of cash flows.
[3] | Capital expenditures include changes in capital accruals, acquisitions (including any goodwill) and investments in affiliates.
[4] | The three months ended March 31, 2017 includes an investment of $500 million in MarEn Bakken related to the Bakken Pipeline system. The three months ended March 31, 2016 includes an adjustment of $143 million to the fair value of equity method investments acquired in connection with the MarkWest Merger
[5] | Includes capitalized interest of $12 million and $17 million for the three months ended March 31, 2017 and 2016, respectively

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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises 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 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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