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Equity Method Investments - Summary of Equity Method Investment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Sep. 01, 2017
Jan. 01, 2017
Schedule of Equity Method Investments [Line Items]          
Revenues and other income $ 403 $ 103      
Costs and expenses 217 66      
Income (loss) from operations 186 37      
Net income (loss) 173 33      
Income from equity method investments [1] 61 5      
Current assets 505   $ 510    
Noncurrent assets 7,733   7,631    
Current liabilities 294   303    
Noncurrent liabilities 885   918    
Difference between carrying amount and underlying equity 1,000   1,000    
Difference between carrying amount and underlying equity portion related to goodwill 459   459    
Equity method investments $ 4,033   4,010    
Centrahoma Processing LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 40.00%        
Equity method investments $ 121   121    
MarkWest Utica EMG          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 56.00%        
Revenues and other income $ 63 50      
Costs and expenses 44 25      
Income (loss) from operations 19 25      
Net income (loss) 19 25      
Income from equity method investments [1] 1 4      
Current assets 71   65    
Noncurrent assets [2] 2,035   2,077    
Current liabilities 24   39    
Noncurrent liabilities 4   3    
Equity method investments 2,116   2,139    
Other VIEs [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues and other income 43 8      
Costs and expenses 18 8      
Income (loss) from operations 25 0      
Net income (loss) 25 0      
Income from equity method investments [1] 14 (1)      
Current assets 71   46    
Noncurrent assets 1,002   930    
Current liabilities 87   44    
Noncurrent liabilities 11   11    
Equity method investments 8   8    
Non-VIEs [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenues and other income 297 45      
Costs and expenses 155 33      
Income (loss) from operations 142 12      
Net income (loss) 129 8      
Income from equity method investments [1] 46 $ 2      
Current assets 363   399    
Noncurrent assets 4,696   4,624    
Current liabilities 183   220    
Noncurrent liabilities $ 870   904    
Ohio Condensate Company, LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 60.00%        
Equity method investments $ 11   11    
Ohio Gathering          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 34.00%        
Investment in subsidiary $ 784   790    
Explorer          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 25.00%     25.00%  
Equity method investments $ 97   89    
Illinois Extension          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 35.00%     35.00%  
Equity method investments $ 288   284    
LOCAP          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 59.00%     59.00%  
Equity method investments $ 26   24    
LOOP          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 41.00%     41.00%  
Equity method investments $ 225   225    
MarEn Bakken Company LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 25.00%        
Equity method investments $ 529   520    
Jefferson Dry Gas          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 67.00%        
Equity method investments $ 178   164    
Panola Pipeline Company LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 15.00%        
Equity method investments $ 23   24    
Sherwood Midstream          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 50.00%        
Equity method investments $ 260   236    
Sherwood Midstream Holdings          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 81.00%        
Equity method investments $ 151   $ 165    
Direct Ownership Interest [Member] | Sherwood Midstream Holdings          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 62.00%       79.00%
[1] “Income (loss) from equity method investments” includes the impact of any basis differential amortization or accretion.
[2] MarkWest Utica EMG, L.L.C.’s (“MarkWest Utica EMG”) noncurrent assets include its investment in its subsidiary, Ohio Gathering Company, L.L.C. (“Ohio Gathering”), which does not appear elsewhere in this table. The investment was $784 million and $790 million as of March 31, 2018 and December 31, 2017, respectively.