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Derivative Instruments and Hedging Activities (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivatives, Fair Value [Line Items]          
Derivative Asset, Fair Value $ 556   $ 556   $ 890
Derivative Liability, Fair Value 0   0   0
(Gain) Loss on Commodity Derivative Instruments 87 $ 236 (63) $ 311  
Cash Received (Paid) In Settlement Of Derivative Instruments Not Designated As Hedging Instruments 187 (49) 397 (83)  
Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments 274 187 334 228  
(Gain) Loss on Commodity Derivative Instruments 87 236 (63) 311  
Current Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Fair Value 456   456   710
Derivative Liability, Fair Value 0   0   0
Noncurrent Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Fair Value 100   100   180
Derivative Liability, Fair Value 0   0   $ 0
Crude Oil [Member]          
Derivatives, Fair Value [Line Items]          
(Gain) Loss on Commodity Derivative Instruments (157) 46 (342) 73  
Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments 242 192 297 219  
(Gain) Loss on Commodity Derivative Instruments 85 238 (45) 292  
Natural Gas [Member]          
Derivatives, Fair Value [Line Items]          
(Gain) Loss on Commodity Derivative Instruments (30) 3 (55) 10  
Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments 32 (5) 37 9  
(Gain) Loss on Commodity Derivative Instruments $ 2 $ (2) $ (18) $ 19