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Investments and Cash - Gross Unrealized Loss by Length of Time (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Less than 12 months    
Fair Value $ 3,751 $ 804
Gross Unrealized Loss (213) (17)
12 months or more    
Fair Value 1,017 120
Gross Unrealized Loss (239) (9)
Total    
Fair Value 4,768 924
Gross Unrealized Loss $ (452) $ (26)
Number of securities    
Less than 12 months (in securities) | Security 1,340 355
12 months or more (in securities) | Security 466 60
Total (in securities) | Security 1,776 410
Obligations of state and political subdivisions    
Less than 12 months    
Fair Value $ 1,763 $ 117
Gross Unrealized Loss (79) (3)
12 months or more    
Fair Value 163 10
Gross Unrealized Loss (56) (1)
Total    
Fair Value 1,926 127
Gross Unrealized Loss (135) (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 (8) (2)
Total    
Fair Value 84 58
Gross Unrealized Loss (8) (2)
Corporate securities    
Less than 12 months    
Fair Value 1,276 407
Gross Unrealized Loss (95) (12)
12 months or more    
Fair Value 519 70
Gross Unrealized Loss (147) (5)
Total    
Fair Value 1,795 477
Gross Unrealized Loss (242) (17)
RMBS    
Less than 12 months    
Fair Value 147 4
Gross Unrealized Loss (9) 0
12 months or more    
Fair Value 3 0
Gross Unrealized Loss (1) 0
Total    
Fair Value 150 4
Gross Unrealized Loss (10) 0
CMBS    
Less than 12 months    
Fair Value 270  
Gross Unrealized Loss (11)  
12 months or more    
Fair Value 0  
Gross Unrealized Loss 0  
Total    
Fair Value 270  
Gross Unrealized Loss (11)  
CLOs    
Less than 12 months    
Fair Value 171 226
Gross Unrealized Loss (7) 0
12 months or more    
Fair Value 250 0
Gross Unrealized Loss (14) 0
Total    
Fair Value 421 226
Gross Unrealized Loss (21) 0
Others    
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 65 24
Gross Unrealized Loss (10) (2)
12 months or more    
Fair Value 30 8
Gross Unrealized Loss (13) (1)
Total    
Fair Value 95 32
Gross Unrealized Loss $ (23) $ (3)