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Equity Method Investments - Summary of Equity Method Investment Financial Information (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
Schedule of Equity Method Investments [Line Items]          
Revenues and other income     $ 200 $ 193  
Costs and expenses     138 201  
Income from operations     62 (8)  
Net income (loss)     61 (8)  
Income (loss) from equity method investments $ 1 $ (83) 6 [1] (78) [1]  
Current assets 154   154   $ 87
Noncurrent assets 5,405   5,405   2,695
Current liabilities 113   113   60
Noncurrent liabilities 15   15   15
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 1,100   1,100   1,100
MarkWest Utica EMG [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues and other income     88 113  
Costs and expenses     48 45  
Income from operations     40 68  
Net income (loss)     40 68  
Income (loss) from equity method investments [1]     2 7  
Current assets 72   72   45
Noncurrent assets [2] 2,103   2,103   2,173
Current liabilities 26   26   30
Noncurrent liabilities 2   2   2
Equity Method Investment Difference Between Carrying Amount And Underlying Equity Portion Related To Goodwill Not Amortized 459   459    
Other VIEs [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues and other income     21 10  
Costs and expenses     17 104 [3]  
Income from operations     4 (94)  
Net income (loss)     4 (94)  
Income (loss) from equity method investments [1]     (1) (88)  
Current assets 49   49   2
Noncurrent assets 881   881   132
Current liabilities 69   69   4
Noncurrent liabilities 13   13   13
Non-VIEs [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues and other income     91 70  
Costs and expenses     73 52  
Income from operations     18 18  
Net income (loss)     17 18  
Income (loss) from equity method investments [1]     5 3  
Current assets 33   33   40
Noncurrent assets 2,421   2,421   390
Current liabilities 18   18   26
Noncurrent liabilities 0   0   0
Ohio Condensate Company, LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Impairment related to equity method investment from asset impairment and elimination of basis differential       $ 89  
Ohio Gathering Company, LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Investments in subsidiary $ 794   $ 794   $ 794
[1] Income (loss) from equity method investments includes the impact of any basis differential amortization or accretion.
[2] MarkWest Utica EMG’s noncurrent assets include its investment in its subsidiary Ohio Gathering, which does not appear elsewhere in this table. The investment was $794 million as of June 30, 2017 and December 31, 2016.
[3] Includes an impairment charge of $89 million for the six months ended June 30, 2016 related to the Partnership’s investment in Ohio Condensate, which does not appear separately in this table.