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Investments - Gross Unrealized Loss by Length of Time (Details)
$ in Millions
Mar. 31, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Less than 12 months    
Fair Value $ 2,300 $ 804
Gross Unrealized Loss $ (108) $ (17)
Number of securities | Security 740 355
12 months or more    
Fair Value $ 175 $ 120
Gross Unrealized Loss $ (18) $ (9)
Number of securities | Security 81 60
Total    
Fair Value $ 2,475 $ 924
Gross Unrealized Loss $ (126) $ (26)
Number of securities | Security 814 410
Obligations of state and political subdivisions    
Less than 12 months    
Fair Value $ 849 $ 117
Gross Unrealized Loss (47) (3)
12 months or more    
Fair Value 28 10
Gross Unrealized Loss (4) (1)
Total    
Fair Value 877 127
Gross Unrealized Loss (51) (4)
U.S. government and agencies    
Less than 12 months    
Fair Value 26 26
Gross Unrealized Loss (1) 0
12 months or more    
Fair Value 32 32
Gross Unrealized Loss (4) (2)
Total    
Fair Value 58 58
Gross Unrealized Loss (5) (2)
Corporate securities    
Less than 12 months    
Fair Value 825 407
Gross Unrealized Loss (50) (12)
12 months or more    
Fair Value 49 70
Gross Unrealized Loss (8) (5)
Total    
Fair Value 874 477
Gross Unrealized Loss (58) (17)
RMBS    
Less than 12 months    
Fair Value 74 4
Gross Unrealized Loss (1) 0
12 months or more    
Fair Value 0 0
Gross Unrealized Loss 0 0
Total    
Fair Value 74 4
Gross Unrealized Loss (1) 0
CMBS    
Less than 12 months    
Fair Value 100  
Gross Unrealized Loss (1)  
12 months or more    
Fair Value 0  
Gross Unrealized Loss 0  
Total    
Fair Value 100  
Gross Unrealized Loss (1)  
CLOs and CLO warehouse assets:    
Less than 12 months    
Fair Value 327 226
Gross Unrealized Loss (3) 0
12 months or more    
Fair Value 54 0
Gross Unrealized Loss 0 0
Total    
Fair Value 381 226
Gross Unrealized Loss (3) 0
Other    
Less than 12 months    
Fair Value 17  
Gross Unrealized Loss (1)  
12 months or more    
Fair Value 0  
Gross Unrealized Loss 0  
Total    
Fair Value 17  
Gross Unrealized Loss (1)  
Non-U.S. government securities    
Less than 12 months    
Fair Value 82 24
Gross Unrealized Loss (4) (2)
12 months or more    
Fair Value 12 8
Gross Unrealized Loss (2) (1)
Total    
Fair Value 94 32
Gross Unrealized Loss $ (6) $ (3)