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Investments - OTTI (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
securities
Dec. 31, 2018
USD ($)
securities
Dec. 31, 2017
USD ($)
securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 40 $ 20 $ 12
No. of Securities | securities 235 66 26
Credit Impairments $ 20 $ 14 $ 12
Intent Impairments 20 6 0
State, municipalities and political subdivisions      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 0 $ 0 $ 0
No. of Securities | securities 6 0 0
U.S. corporate public securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 11 $ 6 $ 0
No. of Securities | securities 25 2 3
U.S. corporate private securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 1 $ 0 $ 0
No. of Securities | securities 16 0 0
Foreign corporate public securities and foreign governments      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 3 $ 2 $ 2
No. of Securities | securities 15 3 3
Foreign corporate private securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 18 $ 9 $ 9
No. of Securities | securities 11 1 2
Residential mortgage-backed securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 4 $ 3 $ 1
No. of Securities | securities 71 58 17
Commercial mortgage-backed securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 0 $ 0 $ 0
No. of Securities | securities 18 1 1
Other asset-backed securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 3 $ 0 $ 0
No. of Securities | securities 73 1 0