General and Management's Representation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Notes to Condensed Consolidated Financial Statements [Abstract]
Out of period adjustment for sales rebates	$ 3	$ 2		$ 1
Out of period income tax adjustment			$ 2