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Investments (Details Textual)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
security
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Investment [Line Items]      
Percentage (based on amount of unrealized loss) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade 57.00%    
Percentage (based on fair value) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade 79.00%    
Other than temporary impairment charges $ 52 $ 4  
Average life of ABS 5 years    
Average life of MBS 4 years 6 months    
Residential Mortgage Backed Securities [Member]      
Investment [Line Items]      
Non-credit related portion of other-than-temporary impairment charges taken for securities still owned $ 201   $ 205
Fixed maturities, Gross Unrealized, Losses (26)   (15)
Other than temporary impairment charges 2    
Securities with non-credit other-than-temporary impairment charges [Member]      
Investment [Line Items]      
Gross Unrealized, Gains 126   134
Gross Unrealized, Losses (9)   (6)
Fixed maturities [Member]      
Investment [Line Items]      
Fixed maturities, Gross Unrealized, Losses $ (280)   (374)
Number of available for sale securities in an unrealized loss position | security 868    
Other than temporary impairment charges $ 16 $ 5  
Corporate bonds [Member]      
Investment [Line Items]      
Other than temporary impairment charges $ 14    
Common stocks [Member]      
Investment [Line Items]      
Number of available for sale securities in an unrealized loss position | security 63    
Other than temporary impairment charges $ 38    
Equity securities, Gross Unrealized, Losses $ (81)   (79)
Preferred stocks [Member]      
Investment [Line Items]      
Number of available for sale securities in an unrealized loss position | security 24    
Other than temporary impairment charges $ 3    
Equity securities, Gross Unrealized, Losses $ (9)   $ (6)
Number of available for sale securities in an unrealized loss position for twelve months or longer [Member] | Common stocks [Member]      
Investment [Line Items]      
Number of available for sale securities in an unrealized loss position | security 1    
Number of available for sale securities in an unrealized loss position for twelve months or longer [Member] | Preferred stocks [Member]      
Investment [Line Items]      
Number of available for sale securities in an unrealized loss position | security 3