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Investments (Details 14) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Municipal Bonds      
Threshold percentage of municipal to total carrying value 5.00% 5.00%  
Securities loaned      
Fixed income and equity securities loaned $ 518 $ 492  
Interest income on collateral, net of fees 1 1 $ 1
Other investment information      
Below investment grade assets 3,200 $ 3,310  
Fixed income securities and short-term investments deposited with regulatory authorities 31    
Non-income producing fixed income securities and other investments $ 10    
Shareholders' equity | Concentration of credit risk | Minimum      
Municipal Bonds      
Percentage of credit concentration risk of single issuer and affiliates of shareholder's equity 10.00%    
Texas      
Municipal Bonds      
Percentage of municipal bonds carrying value 15.90% 13.60%  
California      
Municipal Bonds      
Percentage of municipal bonds carrying value 15.00% 17.00%  
Oregon      
Municipal Bonds      
Percentage of municipal bonds carrying value 8.40% 5.80%  
New Jersey      
Municipal Bonds      
Percentage of municipal bonds carrying value 6.80% 5.10%  
Illinois      
Municipal Bonds      
Percentage of municipal bonds carrying value 3.80% 5.30%