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Investments - Unrealized Loss Position (Details)
$ in Millions
Dec. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 468 522
Number of Securities, Greater than 12 months | security 59 200
Number of Securities | security 527 722
Fair Value    
Fair Value, Less than 12 months $ 869 $ 982
Fair Value, Greater than 12 months 46 187
Fair Value 915 1,169
Unrealized Losses    
Unrealized Losses, Less than 12 months 10 6
Unrealized Losses, Greater than 12 months 1 5
Unrealized Losses $ 11 $ 11
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 32 52
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 32 52
Fair Value    
Fair Value, Less than 12 months $ 205 $ 168
Fair Value, Greater than 12 months 0 0
Fair Value 205 168
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 0 $ 1
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 49 66
Number of Securities, Greater than 12 months | security 0 2
Number of Securities | security 49 68
Fair Value    
Fair Value, Less than 12 months $ 83 $ 115
Fair Value, Greater than 12 months 0 5
Fair Value 83 120
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 0 $ 1
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 145 181
Number of Securities, Greater than 12 months | security 2 2
Number of Securities | security 147 183
Fair Value    
Fair Value, Less than 12 months $ 155 $ 305
Fair Value, Greater than 12 months 0 0
Fair Value 155 305
Unrealized Losses    
Unrealized Losses, Less than 12 months 8 2
Unrealized Losses, Greater than 12 months 0 1
Unrealized Losses $ 8 $ 3
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 41 39
Number of Securities, Greater than 12 months | security 5 0
Number of Securities | security 46 39
Fair Value    
Fair Value, Less than 12 months $ 69 $ 75
Fair Value, Greater than 12 months 5 0
Fair Value 74 75
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 1 $ 1
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 23 30
Number of Securities, Greater than 12 months | security 3 9
Number of Securities | security 26 39
Fair Value    
Fair Value, Less than 12 months $ 26 $ 16
Fair Value, Greater than 12 months 0 0
Fair Value 26 16
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 22 16
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 22 16
Fair Value    
Fair Value, Less than 12 months $ 75 $ 49
Fair Value, Greater than 12 months 0 0
Fair Value 75 49
Unrealized Losses    
Unrealized Losses, Less than 12 months 0 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 0 $ 0
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 156 138
Number of Securities, Greater than 12 months | security 49 187
Number of Securities | security 205 325
Fair Value    
Fair Value, Less than 12 months $ 256 $ 254
Fair Value, Greater than 12 months 41 182
Fair Value 297 436
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 1
Unrealized Losses, Greater than 12 months 1 4
Unrealized Losses $ 2 $ 5