v2.4.0.6

Derivative Instruments (Details 2) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	$ 487		$ 1,051
Derivative Assets, Noncurrent	146		113
Total derivative assets	633		1,164
Current derivative liabilities	457		1,144
Derivative Liabilities, Noncurrent	286		279
Total derivative liabilities	743		1,423
Net derivative assets (liabilities)	(110)		(259)
Fair Value of Derivative Assets	633		1,164
Fair Value of Derivative Liabilities	743		1,423
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	22	[1]	61	[1]
Fair Value of Derivative Liabilities	191	[1]	167	[1]
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	611		1,103
Fair Value of Derivative Liabilities	552		1,256
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	0		0
Long-term derivative assets	5		10
Total derivative assets	5		10
Current derivative liabilities	36		166
Derivative Liabilities, Noncurrent	172		154
Total derivative liabilities	208		320
Net derivative assets (liabilities)	(203)		(310)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	5	[1]	10	[1]
Fair Value of Derivative Liabilities	189	[1]	149	[1]
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	0		0
Fair Value of Derivative Liabilities	19		171
Commodity Option [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	487		1,051
Long-term derivative assets	141		103
Total derivative assets	628		1,154
Current derivative liabilities	421		978
Derivative Liabilities, Noncurrent	114		125
Total derivative liabilities	535		1,103
Net derivative assets (liabilities)	93		51
Commodity Option [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	17	[1]	51	[1]
Fair Value of Derivative Liabilities	2	[1]	18	[1]
Commodity Option [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	611		1,103
Fair Value of Derivative Liabilities	$ 533		$ 1,085
[1] Includes accumulated fair value of derivative instruments as of the date hedge accounting was discontinued, net of amortized fair value for settlement periods which have transpired.

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