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Investments - Gross Unrealized Loss by Length of Time (Details)
$ in Millions
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Less than 12 months    
Fair Value $ 830 $ 766
Gross Unrealized Loss $ (5) $ (7)
Number of securities | security 319 274
12 months or more    
Fair Value $ 3,259 $ 3,162
Gross Unrealized Loss $ (305) $ (281)
Number of securities | security 1,311 1,266
Total    
Fair Value $ 4,089 $ 3,928
Gross Unrealized Loss $ (310) $ (288)
Number of securities | security 1,609 1,525
Obligations of state and political subdivisions    
Less than 12 months    
Fair Value $ 603 $ 641
Gross Unrealized Loss (3) (4)
12 months or more    
Fair Value 1,250 931
Gross Unrealized Loss (96) (87)
Total    
Fair Value 1,853 1,572
Gross Unrealized Loss (99) (91)
U.S. government and agencies    
Less than 12 months    
Fair Value 7 0
Gross Unrealized Loss 0 0
12 months or more    
Fair Value 33 33
Gross Unrealized Loss (6) (6)
Total    
Fair Value 40 33
Gross Unrealized Loss (6) (6)
Corporate securities    
Less than 12 months    
Fair Value 164 72
Gross Unrealized Loss (2) (1)
12 months or more    
Fair Value 1,384 1,426
Gross Unrealized Loss (168) (152)
Total    
Fair Value 1,548 1,498
Gross Unrealized Loss (170) (153)
RMBS    
Less than 12 months    
Fair Value 34 27
Gross Unrealized Loss 0 (1)
12 months or more    
Fair Value 138 124
Gross Unrealized Loss (11) (8)
Total    
Fair Value 172 151
Gross Unrealized Loss (11) (9)
CMBS    
Less than 12 months    
Fair Value 4 3
Gross Unrealized Loss 0 0
12 months or more    
Fair Value 127 148
Gross Unrealized Loss (6) (6)
Total    
Fair Value 131 151
Gross Unrealized Loss (6) (6)
CLOs    
Less than 12 months    
Fair Value 9 22
Gross Unrealized Loss 0 (1)
12 months or more    
Fair Value 222 379
Gross Unrealized Loss (2) (6)
Total    
Fair Value 231 401
Gross Unrealized Loss (2) (7)
Other    
Less than 12 months    
Fair Value 9 1
Gross Unrealized Loss 0 0
12 months or more    
Fair Value 26 26
Gross Unrealized Loss (1) (1)
Total    
Fair Value 35 27
Gross Unrealized Loss (1) (1)
Non-U.S. government securities    
Less than 12 months    
Fair Value 0 0
Gross Unrealized Loss 0 0
12 months or more    
Fair Value 79 95
Gross Unrealized Loss (15) (15)
Total    
Fair Value 79 95
Gross Unrealized Loss $ (15) $ (15)