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Derivative Instruments and Hedging Activities (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 120		$ 120		$ 592
Derivative Liability, Fair Value	35		35		0
(Gain) Loss on Commodity Derivative Instruments	(55)	$ (267)	53	$ (331)
Non-cash Portion of Loss on Commodity Derivative Instruments	(132)	(284)	(454)	(683)
(Gain) Loss on Commodity Derivative Instruments	77	17	507	352
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	120		120		582
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value					0
Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0		0		10
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	8		8		$ 0
Crude Oil [Member]
Derivatives, Fair Value [Line Items]
(Gain) Loss on Commodity Derivative Instruments	(39)	(231)	46	(277)
Non-cash Portion of Loss on Commodity Derivative Instruments	(119)	(235)	(395)	(578)
(Gain) Loss on Commodity Derivative Instruments	80	4	441	301
Natural Gas [Member]
Derivatives, Fair Value [Line Items]
(Gain) Loss on Commodity Derivative Instruments	(16)	(39)	7	(57)
Non-cash Portion of Loss on Commodity Derivative Instruments	(13)	(42)	(59)	(98)
(Gain) Loss on Commodity Derivative Instruments	(3)	3	66	41
Natural Gas Liquids [Member]
Derivatives, Fair Value [Line Items]
(Gain) Loss on Commodity Derivative Instruments	0	3	0	3
Non-cash Portion of Loss on Commodity Derivative Instruments	0	(7)		(7)
(Gain) Loss on Commodity Derivative Instruments	$ 0	$ 10	$ 0	$ 10