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Derivative And Hedging Activities (Derivatives Not Designated As Hedging Instruments Disclosure) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Gain (loss) recognized in net income (loss)	$ (19)	$ 51	$ (18)	$ 81
Commodity Contracts Derivatives [Member]
Gain (loss) recognized in net income (loss)	433	(11)	(371)	554
Commodity Contracts Derivatives [Member] \| Natural Gas And Oil Sales [Member]
Gain (loss) recognized in net income (loss)	439	(57)	(360)	486
Interest Rate Contracts Derivatives [Member] \| Interest Expense [Member]
Gain (loss) recognized in net income (loss)	$ (6)	$ 46	$ (11)	$ 68

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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