Investments (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 security	Dec. 31, 2012	Dec. 31, 2011
Investment [Line Items]
Gross unrealized losses on fixed maturities	$ (305)
Number of available for sale fixed maturities in an unrealized loss position	1,200
Percentage (based on amount of unrealized loss) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade	89.00%
Percentage (based on fair value) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade	90.00%
Other than temporary impairment charges	12	26	52
Average life of ABS	5 years
Average life of MBS	4 years 6 months
Percentage increase in shareholders' equity	10.00%	10.00%
Realized gain (loss) from the mark-to-market of certain MBS (less than in 2011)	(3)	5	(1)
Residential Mortgage Backed Securities [Member]
Investment [Line Items]
Non-credit related portion of other-than-temporary impairment charges taken for securities still owned	229	227
Gross unrealized losses on fixed maturities	(28)	(54)
Other than temporary impairment charges	$ 1