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Investments - Unrealized Loss Position (Details)
$ in Millions
Mar. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Number of Securities    
Number of Securities, Less than 12 months | security 2,947 522
Number of Securities, Greater than 12 months | security 102 200
Number of Securities | security 3,049 722
Fair Value    
Fair Value, Less than 12 months $ 3,630 $ 982
Fair Value, Greater than 12 months 70 187
Fair Value 3,700 1,169
Unrealized Losses    
Unrealized Losses, Less than 12 months 232 6
Unrealized Losses, Greater than 12 months 14 5
Unrealized Losses $ 246 $ 11
U.S. government securities    
Number of Securities    
Number of Securities, Less than 12 months | security 8 52
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 8 52
Fair Value    
Fair Value, Less than 12 months $ 20 $ 168
Fair Value, Greater than 12 months 0 0
Fair Value 20 168
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 174 66
Number of Securities, Greater than 12 months | security 0 2
Number of Securities | security 174 68
Fair Value    
Fair Value, Less than 12 months $ 314 $ 115
Fair Value, Greater than 12 months 0 5
Fair Value 314 120
Unrealized Losses    
Unrealized Losses, Less than 12 months 7 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 7 $ 1
U.S. corporate securities    
Number of Securities    
Number of Securities, Less than 12 months | security 1,622 181
Number of Securities, Greater than 12 months | security 6 2
Number of Securities | security 1,628 183
Fair Value    
Fair Value, Less than 12 months $ 1,712 $ 305
Fair Value, Greater than 12 months 2 0
Fair Value 1,714 305
Unrealized Losses    
Unrealized Losses, Less than 12 months 108 2
Unrealized Losses, Greater than 12 months 1 1
Unrealized Losses $ 109 $ 3
Foreign securities    
Number of Securities    
Number of Securities, Less than 12 months | security 513 39
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 513 39
Fair Value    
Fair Value, Less than 12 months $ 630 $ 75
Fair Value, Greater than 12 months 0 0
Fair Value 630 75
Unrealized Losses    
Unrealized Losses, Less than 12 months 48 1
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 48 $ 1
Residential mortgage-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 14 30
Number of Securities, Greater than 12 months | security 7 9
Number of Securities | security 21 39
Fair Value    
Fair Value, Less than 12 months $ 0 $ 16
Fair Value, Greater than 12 months 0 0
Fair Value 0 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 21 16
Number of Securities, Greater than 12 months | security 0 0
Number of Securities | security 21 16
Fair Value    
Fair Value, Less than 12 months $ 50 $ 49
Fair Value, Greater than 12 months 0 0
Fair Value 50 49
Unrealized Losses    
Unrealized Losses, Less than 12 months 1 0
Unrealized Losses, Greater than 12 months 0 0
Unrealized Losses $ 1 $ 0
Other asset-backed securities    
Number of Securities    
Number of Securities, Less than 12 months | security 589 138
Number of Securities, Greater than 12 months | security 89 187
Number of Securities | security 678 325
Fair Value    
Fair Value, Less than 12 months $ 893 $ 254
Fair Value, Greater than 12 months 68 182
Fair Value 961 436
Unrealized Losses    
Unrealized Losses, Less than 12 months 67 1
Unrealized Losses, Greater than 12 months 13 4
Unrealized Losses $ 80 $ 5
Redeemable preferred securities    
Number of Securities    
Number of Securities, Less than 12 months | security 6  
Number of Securities, Greater than 12 months | security 0  
Number of Securities | security 6  
Fair Value    
Fair Value, Less than 12 months $ 11  
Fair Value, Greater than 12 months 0  
Fair Value 11  
Unrealized Losses    
Unrealized Losses, Less than 12 months 1  
Unrealized Losses, Greater than 12 months 0  
Unrealized Losses $ 1