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Investments - Unrealized Loss Position (Details)
$ in Millions
Jun. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 1,279 522
Number of Securities, Greater than 12 months | security 109 200
Number of Securities | security 1,388 722
Fair Value    
Fair Value, Less than 12 months $ 1,684 $ 982
Fair Value, Greater than 12 months 84 187
Fair Value 1,768 1,169
Unrealized Losses    
Unrealized Losses, Less than 12 months 46 6
Unrealized Losses, Greater than 12 months 7 5
Unrealized Losses $ 53 $ 11
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 22 52
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 22 52
Fair Value    
Fair Value, Less than 12 months $ 105 $ 168
Fair Value, Greater than 12 months 0 0
Fair Value 105 168
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 83 66
Number of Securities, Greater than 12 months | security 0 2
Number of Securities | security 83 68
Fair Value    
Fair Value, Less than 12 months $ 169 $ 115
Fair Value, Greater than 12 months 0 5
Fair Value 169 120
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 2 $ 1
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 569 181
Number of Securities, Greater than 12 months | security 8 2
Number of Securities | security 577 183
Fair Value    
Fair Value, Less than 12 months $ 481 $ 305
Fair Value, Greater than 12 months 3 0
Fair Value 484 305
Unrealized Losses    
Unrealized Losses, Less than 12 months 17 2
Unrealized Losses, Greater than 12 months 1 1
Unrealized Losses $ 18 $ 3
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 171 39
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 171 39
Fair Value    
Fair Value, Less than 12 months $ 245 $ 75
Fair Value, Greater than 12 months 0 0
Fair Value 245 75
Unrealized Losses    
Unrealized Losses, Less than 12 months 11 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 11 $ 1
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 21 30
Number of Securities, Greater than 12 months | security 4 9
Number of Securities | security 25 39
Fair Value    
Fair Value, Less than 12 months $ 52 $ 16
Fair Value, Greater than 12 months 0 0
Fair Value 52 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 13 16
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 13 16
Fair Value    
Fair Value, Less than 12 months $ 65 $ 49
Fair Value, Greater than 12 months 0 0
Fair Value 65 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 400 138
Number of Securities, Greater than 12 months | security 97 187
Number of Securities | security 497 325
Fair Value    
Fair Value, Less than 12 months $ 567 $ 254
Fair Value, Greater than 12 months 81 182
Fair Value 648 436
Unrealized Losses    
Unrealized Losses, Less than 12 months 16 1
Unrealized Losses, Greater than 12 months 6 4
Unrealized Losses $ 22 $ 5