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Derivative Instruments and Hedging Activities - Fair Value and Effect on Statement of Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]      
Asset Derivative Instruments $ 15 $ 180  
Liability Derivative Instruments 37 27  
Cash (Received) Paid in Settlement of Commodity Derivative Instruments (32) 161 $ (13)
Total Non-cash Portion of Loss (Gain) on Commodity Derivative Instruments 175 (224) (50)
Total Loss (Gain) on Commodity Derivative Instruments 143 (63) (63)
Crude Oil      
Derivatives, Fair Value [Line Items]      
Cash (Received) Paid in Settlement of Commodity Derivative Instruments (10) 162 (14)
Total Non-cash Portion of Loss (Gain) on Commodity Derivative Instruments 184 (225) 18
Total Loss (Gain) on Commodity Derivative Instruments 174 (63) 4
Natural Gas      
Derivatives, Fair Value [Line Items]      
Cash (Received) Paid in Settlement of Commodity Derivative Instruments (22) (1) 1
Total Non-cash Portion of Loss (Gain) on Commodity Derivative Instruments (6) 1 (68)
Total Loss (Gain) on Commodity Derivative Instruments (28) 0 (67)
NGLs      
Derivatives, Fair Value [Line Items]      
Total Non-cash Portion of Loss (Gain) on Commodity Derivative Instruments (3) 0 0
Total Loss (Gain) on Commodity Derivative Instruments (3) 0 $ 0
Other Current Assets      
Derivatives, Fair Value [Line Items]      
Asset Derivative Instruments 14 180  
Other Current Liabilities      
Derivatives, Fair Value [Line Items]      
Liability Derivative Instruments 36 1  
Other Noncurrent Assets      
Derivatives, Fair Value [Line Items]      
Asset Derivative Instruments 1 0  
Other Noncurrent Liabilities      
Derivatives, Fair Value [Line Items]      
Liability Derivative Instruments $ 1 $ 26