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Investments - Unrealized Loss Position (Details)
$ in Millions
Mar. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 2,396 468
Number of Securities, Greater than 12 months | security 48 59
Number of Securities | security 2,444 527
Fair Value    
Fair Value, Less than 12 months $ 4,537 $ 869
Fair Value, Greater than 12 months 51 46
Fair Value 4,588 915
Unrealized Losses    
Unrealized Losses, Less than 12 months 74 10
Unrealized Losses, Greater than 12 months 1 1
Unrealized Losses $ 75 $ 11
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 235 32
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 235 32
Fair Value    
Fair Value, Less than 12 months $ 877 $ 205
Fair Value, Greater than 12 months 0 0
Fair Value 877 205
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 2 $ 0
States, municipalities and political subdivisions    
Number of Securities    
Number of Securities, Less than 12 months | security 219 49
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 219 49
Fair Value    
Fair Value, Less than 12 months $ 386 $ 83
Fair Value, Greater than 12 months 0 0
Fair Value 386 83
Unrealized Losses    
Unrealized Losses, Less than 12 months 4 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 4 $ 0
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1,199 145
Number of Securities, Greater than 12 months | security 11 2
Number of Securities | security 1,210 147
Fair Value    
Fair Value, Less than 12 months $ 1,633 $ 155
Fair Value, Greater than 12 months 12 0
Fair Value 1,645 155
Unrealized Losses    
Unrealized Losses, Less than 12 months 35 8
Unrealized Losses, Greater than 12 months 1 0
Unrealized Losses $ 36 $ 8
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 293 41
Number of Securities, Greater than 12 months | security 7 5
Number of Securities | security 300 46
Fair Value    
Fair Value, Less than 12 months $ 453 $ 69
Fair Value, Greater than 12 months 8 5
Fair Value 461 74
Unrealized Losses    
Unrealized Losses, Less than 12 months 12 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 12 $ 1
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 105 23
Number of Securities, Greater than 12 months | security 5 3
Number of Securities | security 110 26
Fair Value    
Fair Value, Less than 12 months $ 396 $ 26
Fair Value, Greater than 12 months 0 0
Fair Value 396 26
Unrealized Losses    
Unrealized Losses, Less than 12 months 6 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 6 $ 0
Commercial mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 112 22
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 112 22
Fair Value    
Fair Value, Less than 12 months $ 311 $ 75
Fair Value, Greater than 12 months 0 0
Fair Value 311 75
Unrealized Losses    
Unrealized Losses, Less than 12 months 13 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 13 $ 0
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 231 156
Number of Securities, Greater than 12 months | security 25 49
Number of Securities | security 256 205
Fair Value    
Fair Value, Less than 12 months $ 476 $ 256
Fair Value, Greater than 12 months 31 41
Fair Value 507 297
Unrealized Losses    
Unrealized Losses, Less than 12 months 2 1
Unrealized Losses, Greater than 12 months 0 1
Unrealized Losses $ 2 $ 2
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 2  
Number of Securities, Greater than 12 months | security 0  
Number of Securities | security 2  
Fair Value    
Fair Value, Less than 12 months $ 5  
Fair Value, Greater than 12 months 0  
Fair Value 5  
Unrealized Losses    
Unrealized Losses, Less than 12 months 0  
Unrealized Losses, Greater than 12 months 0  
Unrealized Losses $ 0