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Summary of Significant Accounting Policies - Property and equipment (Details)
12 Months Ended 24 Months Ended 36 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
item
Property and Equipment          
Depreciation expense $ 809,873,000 $ 709,763,000 $ 477,896,000    
Oil and Gas Properties          
Exploratory drilling costs initially capitalized, but subsequently charged to expense 0 0 0    
Impairment of unproved properties for leases expired or expected to expire 163,000,000 104,000,000 15,000,000    
Impairment of proved properties       $ 0 $ 0
Depreciation, depletion, and amortization expense for oil and gas properties $ 700,000,000 615,000,000 419,000,000    
Impairment of long-lived assets other than oil and gas properties         $ 0
Time period that payment is generally received after sale has occurred 1 month        
Number of imbalance positions | item 0       0
Deferred Financing Costs          
Unamortized deferred financing costs included in long-term debt $ 48,000,000       $ 48,000,000
Unamortized deferred financing costs included in other assets 14,000,000       $ 14,000,000
Amounts amortized and the write-off of previously deferred debt issuance costs $ 16,000,000 10,000,000 11,000,000    
Gathering Systems and Facilities          
Property and Equipment          
Estimated useful life P20Y        
Other property and equipment          
Property and Equipment          
Depreciation expense $ 8,900,000 7,700,000 5,900,000    
Other property and equipment | Minimum          
Property and Equipment          
Estimated useful life P2Y        
Other property and equipment | Maximum          
Property and Equipment          
Estimated useful life P20Y        
Gathering pipelines, compressor stations, and fresh water distribution systems          
Property and Equipment          
Depreciation expense $ 101,000,000 $ 87,000,000 $ 53,000,000    
Fresh Water Distribution | Minimum          
Property and Equipment          
Estimated useful life P5Y        
Fresh Water Distribution | Maximum          
Property and Equipment          
Estimated useful life P20Y