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Investments - Unrealized Loss Position (Details)
$ in Millions
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 522 2,279
Number of Securities, Greater than 12 months | security 200 0
Number of Securities | security 722 2,279
Fair Value    
Fair Value, Less than 12 months $ 982 $ 2,409
Fair Value, Greater than 12 months 187 0
Fair Value 1,169 2,409
Unrealized Losses    
Unrealized Losses, Less than 12 months 6 36
Unrealized Losses, Greater than 12 months 5 0
Unrealized Losses $ 11 $ 36
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 52 8
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 52 8
Fair Value    
Fair Value, Less than 12 months $ 168 $ 26
Fair Value, Greater than 12 months 0 0
Fair Value 168 26
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 1 $ 0
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 66 54
Number of Securities, Greater than 12 months | security 2 0
Number of Securities | security 68 54
Fair Value    
Fair Value, Less than 12 months $ 115 $ 86
Fair Value, Greater than 12 months 5 0
Fair Value 120 86
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 1 $ 1
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 181 1,399
Number of Securities, Greater than 12 months | security 2 0
Number of Securities | security 183 1,399
Fair Value    
Fair Value, Less than 12 months $ 305 $ 1,431
Fair Value, Greater than 12 months 0 0
Fair Value 305 1,431
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 16
Unrealized Losses, Greater than 12 months 1 0
Unrealized Losses $ 3 $ 16
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 39 243
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 39 243
Fair Value    
Fair Value, Less than 12 months $ 75 $ 314
Fair Value, Greater than 12 months 0 0
Fair Value 75 314
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 3
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 1 $ 3
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 30 45
Number of Securities, Greater than 12 months | security 9 0
Number of Securities | security 39 45
Fair Value    
Fair Value, Less than 12 months $ 16 $ 1
Fair Value, Greater than 12 months 0 0
Fair Value 16 1
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 0 $ 0
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 16  
Number of Securities, Greater than 12 months | security 0  
Number of Securities | security 16  
Fair Value    
Fair Value, Less than 12 months $ 49  
Fair Value, Greater than 12 months 0  
Fair Value 49  
Unrealized Losses    
Unrealized Losses, Less than 12 months 0  
Unrealized Losses, Greater than 12 months 0  
Unrealized Losses $ 0  
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 138 516
Number of Securities, Greater than 12 months | security 187 0
Number of Securities | security 325 516
Fair Value    
Fair Value, Less than 12 months $ 254 $ 528
Fair Value, Greater than 12 months 182 0
Fair Value 436 528
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 15
Unrealized Losses, Greater than 12 months 4 0
Unrealized Losses $ 5 $ 15
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security   14
Number of Securities, Greater than 12 months | security   0
Number of Securities | security   14
Fair Value    
Fair Value, Less than 12 months   $ 23
Fair Value, Greater than 12 months   0
Fair Value   23
Unrealized Losses    
Unrealized Losses, Less than 12 months   1
Unrealized Losses, Greater than 12 months   0
Unrealized Losses   $ 1