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Investments - Gross Unrealized Loss by Length of Time (Details)
$ in Millions
Sep. 30, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Less than 12 months    
Fair Value $ 4,789 $ 804
Gross Unrealized Loss $ (435) $ (17)
Number of securities | Security 1,799 355
12 months or more    
Fair Value $ 523 $ 120
Gross Unrealized Loss $ (153) $ (9)
Number of securities | Security 288 60
Total    
Fair Value $ 5,312 $ 924
Gross Unrealized Loss $ (588) $ (26)
Number of securities | Security 2,060 410
Obligations of state and political subdivisions    
Less than 12 months    
Fair Value $ 2,450 $ 117
Gross Unrealized Loss (155) (3)
12 months or more    
Fair Value 39 10
Gross Unrealized Loss (15) (1)
Total    
Fair Value 2,489 127
Gross Unrealized Loss (170) (4)
U.S. government and agencies    
Less than 12 months    
Fair Value 32 26
Gross Unrealized Loss 0 0
12 months or more    
Fair Value 52 32
Gross Unrealized Loss (9) (2)
Total    
Fair Value 84 58
Gross Unrealized Loss (9) (2)
Corporate securities    
Less than 12 months    
Fair Value 1,501 407
Gross Unrealized Loss (216) (12)
12 months or more    
Fair Value 271 70
Gross Unrealized Loss (105) (5)
Total    
Fair Value 1,772 477
Gross Unrealized Loss (321) (17)
RMBS    
Less than 12 months    
Fair Value 160 4
Gross Unrealized Loss (11) 0
12 months or more    
Fair Value 1 0
Gross Unrealized Loss 0 0
Total    
Fair Value 161 4
Gross Unrealized Loss (11) 0
CMBS    
Less than 12 months    
Fair Value 277  
Gross Unrealized Loss (11)  
12 months or more    
Fair Value 0  
Gross Unrealized Loss 0  
Total    
Fair Value 277  
Gross Unrealized Loss (11)  
CLOs and CLO warehouse assets:    
Less than 12 months    
Fair Value 272 226
Gross Unrealized Loss (18) 0
12 months or more    
Fair Value 141 0
Gross Unrealized Loss (13) 0
Total    
Fair Value 413 226
Gross Unrealized Loss (31) 0
Other    
Less than 12 months    
Fair Value 27  
Gross Unrealized Loss (2)  
12 months or more    
Fair Value 0  
Gross Unrealized Loss 0  
Total    
Fair Value 27  
Gross Unrealized Loss (2)  
Non-U.S. government securities    
Less than 12 months    
Fair Value 70 24
Gross Unrealized Loss (22) (2)
12 months or more    
Fair Value 19 8
Gross Unrealized Loss (11) (1)
Total    
Fair Value 89 32
Gross Unrealized Loss $ (33) $ (3)