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Investments - Gross Unrealized Loss by Length of Time (Details)
$ in Millions
Mar. 31, 2023
USD ($)
Security
Dec. 31, 2022
USD ($)
Security
Less than 12 months    
Fair Value $ 1,584 $ 3,751
Gross Unrealized Loss $ (32) $ (213)
Number of securities | Security 602 1,340
12 months or more    
Fair Value $ 2,499 $ 1,017
Gross Unrealized Loss $ (333) $ (239)
Number of securities | Security 1,006 466
Total    
Fair Value $ 4,083 $ 4,768
Gross Unrealized Loss $ (365) $ (452)
Number of securities | Security 1,568 1,776
Obligations of state and political subdivisions    
Less than 12 months    
Fair Value $ 667 $ 1,763
Gross Unrealized Loss (10) (79)
12 months or more    
Fair Value 614 163
Gross Unrealized Loss (84) (56)
Total    
Fair Value 1,281 1,926
Gross Unrealized Loss (94) (135)
U.S. government and agencies    
Less than 12 months    
Fair Value 1 32
Gross Unrealized Loss 0 0
12 months or more    
Fair Value 56 52
Gross Unrealized Loss (7) (8)
Total    
Fair Value 57 84
Gross Unrealized Loss (7) (8)
Corporate securities    
Less than 12 months    
Fair Value 627 1,276
Gross Unrealized Loss (14) (95)
12 months or more    
Fair Value 1,150 519
Gross Unrealized Loss (191) (147)
Total    
Fair Value 1,777 1,795
Gross Unrealized Loss (205) (242)
RMBS    
Less than 12 months    
Fair Value 117 147
Gross Unrealized Loss (5) (9)
12 months or more    
Fair Value 51 3
Gross Unrealized Loss (4) (1)
Total    
Fair Value 168 150
Gross Unrealized Loss (9) (10)
CMBS    
Less than 12 months    
Fair Value 114 270
Gross Unrealized Loss (2) (11)
12 months or more    
Fair Value 143 0
Gross Unrealized Loss (7) 0
Total    
Fair Value 257 270
Gross Unrealized Loss (9) (11)
CLOs and CLO warehouse assets:    
Less than 12 months    
Fair Value 42 171
Gross Unrealized Loss (1) (7)
12 months or more    
Fair Value 377 250
Gross Unrealized Loss (19) (14)
Total    
Fair Value 419 421
Gross Unrealized Loss (20) (21)
Other    
Less than 12 months    
Fair Value 12 27
Gross Unrealized Loss 0 (2)
12 months or more    
Fair Value 15 0
Gross Unrealized Loss (1) 0
Total    
Fair Value 27 27
Gross Unrealized Loss (1) (2)
Non-U.S. government securities    
Less than 12 months    
Fair Value 4 65
Gross Unrealized Loss 0 (10)
12 months or more    
Fair Value 93 30
Gross Unrealized Loss (20) (13)
Total    
Fair Value 97 95
Gross Unrealized Loss $ (20) $ (23)