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Investments (Details) - Impairment Charges - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment Information      
Fixed maturities impairment charges $ 4 $ 1  
Other investments impairment charges 0 0  
Total investments impairment charges 4 1  
Impairment charges     $ 14
Fixed maturities [Member]      
Investment Information      
Impairment charges     4
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities [Member]      
Investment Information      
Fixed maturities impairment charges 0 0  
Impairment charges     0
Obligations of states, municipalities and political subdivisions [Member]      
Investment Information      
Fixed maturities impairment charges 0 0  
Impairment charges     0
Debt securities issued by foreign governments [Member]      
Investment Information      
Fixed maturities impairment charges 0 0  
Impairment charges     0
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities [Member]      
Investment Information      
Fixed maturities impairment charges 0 0  
Impairment charges     0
All other corporate bonds [Member]      
Investment Information      
Fixed maturities impairment charges 4 1  
Impairment charges     4
Redeemable preferred stock [Member]      
Investment Information      
Fixed maturities impairment charges $ 0 $ 0  
Impairment charges     0
Equity securities [Member]      
Investment Information      
Impairment charges     9
Public common stock [Member]      
Investment Information      
Impairment charges     9
Non-redeemable preferred stock [Member]      
Investment Information      
Impairment charges     0
Other investments [Member]      
Investment Information      
Impairment charges     $ 1