Accrued Expenses and Other Liabilities (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accrued Expenses and Other Liabilities (Textual) (Abstract)
Benefit (charge) within operating expense	$ 1	$ 4	$ (3)