Derivative Instruments (Details 3) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Derivatives, Fair Value
Total asset derivatives	$ 22	$ 8	$ 32
Total liability derivatives	12	24	30
Commodity futures contracts | Derivatives designated as hedging instruments | Other liabilities (current)
Derivatives, Fair Value
Total liability derivatives	4	3	6
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives	22	8	32
Total liability derivatives	8	21	24
Derivatives not designated as hedging instruments | Foreign exchange contracts | Receivables
Derivatives, Fair Value
Total asset derivatives	19	5	32
Derivatives not designated as hedging instruments | Foreign exchange contracts | Deposits, receivables, and other assets
Derivatives, Fair Value
Total asset derivatives		2
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities (current)
Derivatives, Fair Value
Total asset derivatives	3	1
Total liability derivatives	8	21	18
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities
Derivatives, Fair Value
Total liability derivatives			$ 6