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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