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Investments - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
security
Jun. 30, 2018
USD ($)
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     75.00%    
Percentage (based on fair value) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade     91.00%    
Other than temporary impairment charges $ 2 $ 0 $ 4 $ 1  
Residential MBS          
Investment [Line Items]          
Non-credit related portion of other-than-temporary impairment charges taken for securities still owned 130   130   $ 140
Gross unrealized losses on fixed maturities (4)   (4)   (9)
Securities with non-credit other-than-temporary impairment charges          
Investment [Line Items]          
Gross unrealized gains 120   120   119
Gross unrealized losses (4)   (4)   (4)
Fixed maturities          
Investment [Line Items]          
Gross unrealized losses on fixed maturities (93)   $ (93)   $ (603)
Number of available for sale securities in an unrealized loss position | security     712    
Other than temporary impairment charges $ 3 $ 0 $ 6 1  
Corporate bonds          
Investment [Line Items]          
Other than temporary impairment charges     5    
Maximum | Residential MBS          
Investment [Line Items]          
Other than temporary impairment charges     $ 1 1  
Maximum | Corporate bonds          
Investment [Line Items]          
Other than temporary impairment charges       $ 1