Derivative Instruments, Derivative Gains and Losses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Derivatives Designated for Hedge Accounting [Member] | Commodity Futures Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 4	[1]	$ (3)	[1]
Amount of Gain (Loss) Recognized In Income on Hedged Item	(4)	[1]	4	[1]
Amount of Gain (Loss) Loss Recognized in Income on Ineffective Portion of Derivative (b)	0	[1],[2]	1	[1],[2]
Mark-to-Market Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(16)		(25)		(67)
Mark-to-Market Derivatives [Member] | Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	3		(17)		0
Mark-to-Market Derivatives [Member] | Cost of sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(13)		(9)		(68)
Mark-to-Market Derivatives [Member] | Foreign currency exchange gain (loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(6)		1		1
Mark-to-Market Derivatives [Member] | Commodity Futures Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(28)		(36)		(55)
Mark-to-Market Derivatives [Member] | Commodity OTC Swap Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	15		9		(13)
Mark-to-Market Derivatives [Member] | Commodity Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	3		1		0
Mark-to-Market Derivatives [Member] | Foreign Currency Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (6)		$ 1		$ 1

[1] Gains (losses) recognized in income on the derivative and the hedged item are included in cost of sales in the statements of consolidated operations.

[2] For fair value hedges, no component of the derivative instruments' gains or losses was excluded from the assessment of hedges effectiveness. No amounts were recognized in income for hedged firm commitments that no longer qualify as fair value hedges.