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Derivative and Hedging Activities - Derivative Instruments Table (Details)
MMBbls in Millions, MMBTU in Millions, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
MMBTU
MMBbls
Dec. 31, 2015
USD ($)
MMBTU
MMBbls
Sep. 30, 2015
USD ($)
Derivative [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net $ (177) $ 512 $ 512
Oil [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount, Volume | MMBbls 30.5 32.7  
Derivative Assets (Liabilities), at Fair Value, Net $ (51) $ 137  
Oil [Member] | Fixed-Price Swap [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount, Volume | MMBbls 21.8 13.5  
Derivative Assets (Liabilities), at Fair Value, Net $ (49) $ 144  
Oil [Member] | Call Option [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount, Volume | MMBbls 8.7 19.2  
Derivative Assets (Liabilities), at Fair Value, Net $ (2) $ (7)  
Natural Gas [Member]      
Derivative [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net $ (67) $ 130  
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU 882,000,000 852,000,000  
Natural Gas [Member] | Fixed-Price Swap [Member]      
Derivative [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net $ (43) $ 229  
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU 640,000,000 500,000,000  
Natural Gas [Member] | Call Option [Member]      
Derivative [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net $ (26) $ (99)  
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU 160,000,000 295,000,000  
Natural Gas [Member] | Collar [Member]      
Derivative [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net $ 1 $ 0  
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU 38,000,000 0  
Natural Gas [Member] | Basis Swap [Member]      
Derivative [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net $ 1 $ 0  
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU 44,000,000 57,000,000  
Natural Gas Liquids [Member] | Fixed-Price Swap [Member]      
Derivative [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net $ (3) $ 0  
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU 36 0  
Commodity Contract [Member]      
Derivative [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net $ (121) $ 267