Derivative Instruments (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Derivatives, Fair Value
Total asset derivatives	$ 3	$ 13	$ 5
Total liability derivatives	8	10	11
Derivatives designated as hedging instruments | Commodity futures contracts | Other liabilities (current)
Derivatives, Fair Value
Total liability derivatives	3	6	2
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives	3	13	5
Derivatives not designated as hedging instruments | Foreign exchange contracts | Receivables
Derivatives, Fair Value
Total asset derivatives	2	13	4
Derivatives not designated as hedging instruments | Foreign exchange contracts | Deposits, receivables, and other assets
Derivatives, Fair Value
Total asset derivatives	1
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities (current)
Derivatives, Fair Value
Total asset derivatives			1
Total liability derivatives	$ 5	$ 4	$ 9