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Investments - Unrealized Loss Position (Details)
$ in Millions
Sep. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 1,390 522
Number of Securities, Greater than 12 months | security 97 200
Number of Securities | security 1,487 722
Fair Value    
Fair Value, Less than 12 months $ 2,177 $ 982
Fair Value, Greater than 12 months 82 187
Fair Value 2,259 1,169
Unrealized Losses    
Unrealized Losses, Less than 12 months 35 6
Unrealized Losses, Greater than 12 months 3 5
Unrealized Losses $ 38 $ 11
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 58 52
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 58 52
Fair Value    
Fair Value, Less than 12 months $ 311 $ 168
Fair Value, Greater than 12 months 0 0
Fair Value 311 168
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 95 66
Number of Securities, Greater than 12 months | security 0 2
Number of Securities | security 95 68
Fair Value    
Fair Value, Less than 12 months $ 196 $ 115
Fair Value, Greater than 12 months 0 5
Fair Value 196 120
Unrealized Losses    
Unrealized Losses, Less than 12 months 3 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 3 $ 1
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 704 181
Number of Securities, Greater than 12 months | security 4 2
Number of Securities | security 708 183
Fair Value    
Fair Value, Less than 12 months $ 639 $ 305
Fair Value, Greater than 12 months 2 0
Fair Value 641 305
Unrealized Losses    
Unrealized Losses, Less than 12 months 15 2
Unrealized Losses, Greater than 12 months 0 1
Unrealized Losses $ 15 $ 3
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 198 39
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 198 39
Fair Value    
Fair Value, Less than 12 months $ 312 $ 75
Fair Value, Greater than 12 months 0 0
Fair Value 312 75
Unrealized Losses    
Unrealized Losses, Less than 12 months 10 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 10 $ 1
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 19 30
Number of Securities, Greater than 12 months | security 3 9
Number of Securities | security 22 39
Fair Value    
Fair Value, Less than 12 months $ 70 $ 16
Fair Value, Greater than 12 months 0 0
Fair Value 70 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 28 16
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 28 16
Fair Value    
Fair Value, Less than 12 months $ 106 $ 49
Fair Value, Greater than 12 months 0 0
Fair Value 106 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 288 138
Number of Securities, Greater than 12 months | security 90 187
Number of Securities | security 378 325
Fair Value    
Fair Value, Less than 12 months $ 543 $ 254
Fair Value, Greater than 12 months 80 182
Fair Value 623 436
Unrealized Losses    
Unrealized Losses, Less than 12 months 7 1
Unrealized Losses, Greater than 12 months 3 4
Unrealized Losses $ 10 $ 5