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Derivative Instruments and Hedging Activities (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 229		$ 229		$ 592
Derivative Liability, Fair Value	66		66		0
Loss (Gain) on Commodity Derivative Instruments	151	$ 87	107	$ (63)
Non-cash Portion of Loss on Commodity Derivative Instruments	(144)	(187)	(322)	(397)
Loss (Gain) on Commodity Derivative Instruments	295	274	429	334
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	229		229		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	31		31		$ 0
Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Loss (Gain) on Commodity Derivative Instruments	113	85	84	(45)
Non-cash Portion of Loss on Commodity Derivative Instruments	(120)	(157)	(276)	(342)
Loss (Gain) on Commodity Derivative Instruments	233	242	360	297
Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Loss (Gain) on Commodity Derivative Instruments	38	2	23	(18)
Non-cash Portion of Loss on Commodity Derivative Instruments	(24)	(30)	(46)	(55)
Loss (Gain) on Commodity Derivative Instruments	$ 62	$ 32	$ 69	$ 37