Company Operations by Business Unit - United States Sales to Unaffiliated Customers Outside of the United States (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting [Abstract]
Net sales to unaffiliated customers outside the U.S.	$ 61	$ 48	$ 39