Investments (Details Textuals 12) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011
Investments [Abstract]
Increase Decrease In Debt Securities And Equity Securities With Gross Unrealized Loss Greater Than Ten Million Dollars	$ (426)
Fixed maturity and equity securities available-for-sale investment disclosure with gross unrealized loss of greater than stated monetary value	$ 10