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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]      
Cash Paid (Received) in Settlement of Commodity Derivative Instruments $ 161 $ (13) $ (569)
Asset Derivative Instruments 180 2  
Liability Derivative Instruments 27 73  
Total Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments (224) (50) 708
Total (Gain) Loss on Commodity Derivative Instruments (63) (63) 139
Crude Oil      
Derivatives, Fair Value [Line Items]      
Cash Paid (Received) in Settlement of Commodity Derivative Instruments 162 (14) (499)
Total Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments (225) 18 582
Total (Gain) Loss on Commodity Derivative Instruments (63) 4 83
Natural Gas      
Derivatives, Fair Value [Line Items]      
Cash Paid (Received) in Settlement of Commodity Derivative Instruments (1) 1 (70)
Total Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments 1 (68) 126
Total (Gain) Loss on Commodity Derivative Instruments 0 (67) $ 56
Current Assets      
Derivatives, Fair Value [Line Items]      
Asset Derivative Instruments 180 2  
Current Liabilities      
Derivatives, Fair Value [Line Items]      
Liability Derivative Instruments 1 58  
Noncurrent Assets      
Derivatives, Fair Value [Line Items]      
Asset Derivative Instruments 0 0  
Noncurrent Liabilities      
Derivatives, Fair Value [Line Items]      
Liability Derivative Instruments $ 26 $ 15