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Investments (Details Textual)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
investment
security
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
investment
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     83.00%    
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 $ 30 $ 1 $ 34 $ 2  
Average life of ABS     5 years    
Average life of MBS     4 years 6 months    
The number of investments in individual issuers that exceeded 10% of Shareholders’ Equity | investment     0   0
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 216   $ 216   $ 220
Fixed maturities, Gross Unrealized, Losses (13)   (13)   (15)
Securities with non-credit other-than-temporary impairment charges [Member]          
Investment [Line Items]          
Gross Unrealized, Gains 148   148   151
Gross Unrealized, Losses (7)   (7)   (8)
Fixed maturities [Member]          
Investment [Line Items]          
Fixed maturities, Gross Unrealized, Losses (169)   $ (169)   (79)
Number of available for sale securities in an unrealized loss position | security     1,040    
Other than temporary impairment charges 10 $ 0 $ 15 $ 1  
Corporate bonds [Member]          
Investment [Line Items]          
Other than temporary impairment charges     10    
Municipal bonds [Member]          
Investment [Line Items]          
Other than temporary impairment charges     $ 4    
Common stocks [Member]          
Investment [Line Items]          
Number of available for sale securities in an unrealized loss position | security     47    
Other than temporary impairment charges     $ 25    
Equity securities, Gross Unrealized, Losses (30)   $ (30)   (25)
Preferred stocks [Member]          
Investment [Line Items]          
Number of available for sale securities in an unrealized loss position | security     22    
Equity securities, Gross Unrealized, Losses $ (5)   $ (5)   $ (5)
Maximum [Member] | Residential Mortgage Backed Securities [Member]          
Investment [Line Items]          
Other than temporary impairment charges     $ 1    
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     0    
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