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Investments and Cash - Gross Unrealized Loss by Length of Time (Details)
$ in Millions
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Less than 12 months    
Fair Value $ 1,975 $ 766
Gross Unrealized Loss (40) (7)
12 months or more    
Fair Value 2,417 3,162
Gross Unrealized Loss (277) (281)
Total    
Fair Value 4,392 3,928
Gross Unrealized Loss $ (317) $ (288)
Number of securities    
Less than 12 months (in securities) | security 569 274
12 months or more (in securities) | security 1,065 1,266
Total (in securities) | security 1,591 1,525
Obligations of state and political subdivisions    
Less than 12 months    
Fair Value $ 624 $ 641
Gross Unrealized Loss (7) (4)
12 months or more    
Fair Value 964 931
Gross Unrealized Loss (96) (87)
Total    
Fair Value 1,588 1,572
Gross Unrealized Loss (103) (91)
U.S. government and agencies    
Less than 12 months    
Fair Value 5 0
Gross Unrealized Loss 0 0
12 months or more    
Fair Value 28 33
Gross Unrealized Loss (6) (6)
Total    
Fair Value 33 33
Gross Unrealized Loss (6) (6)
Corporate securities    
Less than 12 months    
Fair Value 762 72
Gross Unrealized Loss (20) (1)
12 months or more    
Fair Value 1,046 1,426
Gross Unrealized Loss (150) (152)
Total    
Fair Value 1,808 1,498
Gross Unrealized Loss (170) (153)
RMBS    
Less than 12 months    
Fair Value 255 27
Gross Unrealized Loss (4) (1)
12 months or more    
Fair Value 123 124
Gross Unrealized Loss (10) (8)
Total    
Fair Value 378 151
Gross Unrealized Loss (14) (9)
CMBS    
Less than 12 months    
Fair Value 83 3
Gross Unrealized Loss 0 0
12 months or more    
Fair Value 103 148
Gross Unrealized Loss (3) (6)
Total    
Fair Value 186 151
Gross Unrealized Loss (3) (6)
CLOs    
Less than 12 months    
Fair Value 151 22
Gross Unrealized Loss (5) (1)
12 months or more    
Fair Value 107 379
Gross Unrealized Loss (1) (6)
Total    
Fair Value 258 401
Gross Unrealized Loss (6) (7)
Others    
Less than 12 months    
Fair Value 60 1
Gross Unrealized Loss (1) 0
12 months or more    
Fair Value 16 26
Gross Unrealized Loss 0 (1)
Total    
Fair Value 76 27
Gross Unrealized Loss (1) (1)
Non-U.S. government securities    
Less than 12 months    
Fair Value 35 0
Gross Unrealized Loss (3) 0
12 months or more    
Fair Value 30 95
Gross Unrealized Loss (11) (15)
Total    
Fair Value 65 95
Gross Unrealized Loss $ (14) $ (15)