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Investments - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
security
Mar. 31, 2018
USD ($)
Dec. 31, 2018
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 85.00%    
Percentage (based on fair value) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade 93.00%    
Other than temporary impairment charges $ 2 $ 1  
Residential MBS      
Investment [Line Items]      
Non-credit related portion of other-than-temporary impairment charges taken for securities still owned 135   $ 140
Gross unrealized losses on fixed maturities (8)   (9)
Securities with non-credit other-than-temporary impairment charges      
Investment [Line Items]      
Gross unrealized gains 123   119
Gross unrealized losses (4)   (4)
Fixed maturities      
Investment [Line Items]      
Gross unrealized losses on fixed maturities $ (189)   $ (603)
Number of available for sale securities in an unrealized loss position | security 1,274    
Other than temporary impairment charges $ 3 1  
Corporate bonds      
Investment [Line Items]      
Other than temporary impairment charges 3 1  
Maximum | Residential MBS      
Investment [Line Items]      
Other than temporary impairment charges $ 1 $ 1