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Investments - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
security
Sep. 30, 2015
USD ($)
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     49.00%    
Percentage (based on fair value) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade     74.00%    
Other than temporary impairment charges $ 16 $ 35 $ 107 $ 69  
Average life of ABS     5 years    
Average life of MBS     4 years    
Residential MBS          
Investment [Line Items]          
Non-credit related portion of other-than-temporary impairment charges taken for securities still owned 192   $ 192   $ 205
Fixed maturities, Gross Unrealized, Losses (14)   (14)   (15)
Other than temporary impairment charges     2    
Securities with non-credit other-than-temporary impairment charges          
Investment [Line Items]          
Gross Unrealized, Gains 131   131   134
Gross Unrealized, Losses (5)   (5)   (6)
Fixed maturities          
Investment [Line Items]          
Fixed maturities, Gross Unrealized, Losses (77)   $ (77)   (374)
Number of available for sale securities in an unrealized loss position | security     475    
Other than temporary impairment charges 2 $ 17 $ 37 $ 32  
Corporate bonds          
Investment [Line Items]          
Other than temporary impairment charges     $ 34    
Common stocks          
Investment [Line Items]          
Number of available for sale securities in an unrealized loss position | security     32    
Other than temporary impairment charges     $ 79    
Equity securities, Gross Unrealized, Losses (27)   $ (27)   (79)
Preferred stocks          
Investment [Line Items]          
Number of available for sale securities in an unrealized loss position | security     14    
Other than temporary impairment charges     $ 4    
Equity securities, Gross Unrealized, Losses $ (3)   $ (3)   $ (6)
Number of available for sale securities in an unrealized loss position for twelve months or longer | Common stocks          
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 | Preferred stocks          
Investment [Line Items]          
Number of available for sale securities in an unrealized loss position | security     1