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Investments - Gross Unrealized Loss by Length of Time (Details)
$ in Millions
Mar. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Less than 12 months    
Fair Value $ 1,311 $ 1,975
Gross Unrealized Loss $ (38) $ (40)
Number of securities | security 416 569
12 months or more    
Fair Value $ 2,223 $ 2,417
Gross Unrealized Loss $ (235) $ (277)
Number of securities | security 1,006 1,065
Total    
Fair Value $ 3,534 $ 4,392
Gross Unrealized Loss $ (273) $ (317)
Number of securities | security 1,399 1,591
Obligations of state and political subdivisions    
Less than 12 months    
Fair Value $ 428 $ 624
Gross Unrealized Loss (4) (7)
12 months or more    
Fair Value 966 964
Gross Unrealized Loss (88) (96)
Total    
Fair Value 1,394 1,588
Gross Unrealized Loss (92) (103)
U.S. government and agencies    
Less than 12 months    
Fair Value 0 5
Gross Unrealized Loss 0 0
12 months or more    
Fair Value 29 28
Gross Unrealized Loss (5) (6)
Total    
Fair Value 29 33
Gross Unrealized Loss (5) (6)
Corporate securities    
Less than 12 months    
Fair Value 465 762
Gross Unrealized Loss (8) (20)
12 months or more    
Fair Value 947 1,046
Gross Unrealized Loss (122) (150)
Total    
Fair Value 1,412 1,808
Gross Unrealized Loss (130) (170)
RMBS    
Less than 12 months    
Fair Value 59 255
Gross Unrealized Loss (1) (4)
12 months or more    
Fair Value 121 123
Gross Unrealized Loss (8) (10)
Total    
Fair Value 180 378
Gross Unrealized Loss (9) (14)
CMBS    
Less than 12 months    
Fair Value 9 83
Gross Unrealized Loss 0 0
12 months or more    
Fair Value 97 103
Gross Unrealized Loss (2) (3)
Total    
Fair Value 106 186
Gross Unrealized Loss (2) (3)
CLOs    
Less than 12 months    
Fair Value 243 151
Gross Unrealized Loss (23) (5)
12 months or more    
Fair Value 30 107
Gross Unrealized Loss 0 (1)
Total    
Fair Value 273 258
Gross Unrealized Loss (23) (6)
Others    
Less than 12 months    
Fair Value 82 60
Gross Unrealized Loss (1) (1)
12 months or more    
Fair Value 13 16
Gross Unrealized Loss 0 0
Total    
Fair Value 95 76
Gross Unrealized Loss (1) (1)
Non-U.S. government securities    
Less than 12 months    
Fair Value 25 35
Gross Unrealized Loss (1) (3)
12 months or more    
Fair Value 20 30
Gross Unrealized Loss (10) (11)
Total    
Fair Value 45 65
Gross Unrealized Loss $ (11) $ (14)