Investments (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 security	Sep. 30, 2013	Dec. 31, 2013
Investment [Line Items]
Number of available for sale fixed maturities in an unrealized loss position			824
Percentage (based on amount of unrealized loss) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade			80.00%
Percentage (based on fair value) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade			89.00%
Other than temporary impairment charges (are less than)	$ 11	$ 5	$ 13	$ 6
Average life of ABS			3 years 6 months
Average life of MBS			4 years 6 months
Percentage increase in shareholders' equity			10.00%		10.00%
Residential Mortgage Backed Securities [Member]
Investment [Line Items]
Non-credit related portion of other-than-temporary impairment charges taken for securities still owned	222		222		229
Gross Unrealized, Gains	416		416		391
Gross Unrealized, Losses	(16)		(16)		(28)
Securities with non-credit other-than-temporary impairment charges [Member]
Investment [Line Items]
Gross Unrealized, Gains	154		154		150
Gross Unrealized, Losses	(7)		(7)		(13)
Fixed maturities [Member]
Investment [Line Items]
Gross Unrealized, Gains	1,651		1,651		1,395
Gross Unrealized, Losses	(95)		(95)		(305)
Other than temporary impairment charges (are less than)	9	0	10	0
Maximum [Member] | Residential Mortgage Backed Securities [Member]
Investment [Line Items]
Other than temporary impairment charges (are less than)			$ 1