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Investments & NCI Sherwood Midstream (Details)
bbl / d in Thousands, $ in Millions
 3 Months Ended
Jan. 01, 2017
USD ($)
bbl / d
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
 [1]
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]        
Contribution of fixed assets to joint venture   $ 0 $ 328  
Equity method investments   $ 4,033   $ 4,010
Sherwood Midstream        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage   50.00%    
Contribution of fixed assets to joint venture $ 134      
Payments to acquire interest in joint venture $ 20      
Equity method investments   $ 260   $ 236
MarkWest Ohio Fractionation Company, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Capacity | bbl / d 20      
Sherwood Midstream | MarkWest Ohio Fractionation Company, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Payments to acquire interest in joint venture $ 126      
Antero Midstream Partners L.P. [Member] | Sherwood Midstream        
Schedule of Equity Method Investments [Line Items]        
Payments to acquire interest in joint venture $ 154      
[1] Contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 5.