Fair Value Measurements (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Fair Value Measurements (Textuals) [Abstract]
Level 3 assets as a percentage of total asset measured at fair value		3.00%
Percentage of level 3 assets that were priced using non-binding broker quotes		95.00%
Total realized/unrealized losses included in net income on liabilities still outstanding	$ 89	$ 19