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Derivative Instruments (Details Textual) (USD $)	3 Months Ended		6 Months Ended
Derivative Instruments (Details Textual) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivative Instruments (Additional Textual) [Abstract]
Recognized an asset related to estimated fair value of derivative instruments	$ 4,400,000		$ 4,400,000
Realization of gain, net of taxes	3,000,000
Gas hedges [Member]
Derivative Instruments (Textual) [Abstract]
Gain or loss recognized in oil and gas contracts	3,230,000,000	186,000,000	5,385,000,000	386,000,000
NGL hedges [Member]
Derivative Instruments (Textual) [Abstract]
Gain or loss recognized in oil and gas contracts	232,000,000	0	232,000,000	0
Crude Oil [Member]
Derivative Instruments (Textual) [Abstract]
Gain or loss recognized in oil and gas contracts	$ 415,000,000	$ (289,000,000)	$ 362,000,000	$ (389,000,000)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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