Derivative Instruments (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Derivatives, Fair Value
Total asset derivatives	$ 4	$ 4	$ 4
Total liability derivatives	13	10	5
Derivatives designated as hedging instruments | Commodity futures contracts | Receivables
Derivatives, Fair Value
Total asset derivatives			1
Derivatives designated as hedging instruments | Commodity futures contracts | Other liabilities (current)
Derivatives, Fair Value
Total liability derivatives	1	1	1
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives	4	4	3
Derivatives not designated as hedging instruments | Foreign exchange contracts | Receivables
Derivatives, Fair Value
Total asset derivatives	4	4	2
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 liability derivatives	$ 12	$ 9	$ 4