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Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]      
Maturity period (less than) 15 years    
Interest receivable $ 53 $ 35  
Minimum MLR, medical cost corridors and profit sharing liability 1,344 1,145  
Government agencies liability 64 84  
Risk adjustments liability 66 76  
Risk adjustment payable 201 230  
Risk adjustment receivable 241 135  
Risk adjustment, net receivable 40    
Risk adjustment, credit loss allowances 41    
Risk adjustment, net payable   95  
Prepaid reinsurance premiums 11 2 $ 2
Reinsurance recoveries 21 35 $ 33
Reinsurance recoverable $ 28 $ 27  
NEW YORK      
Property, Plant and Equipment [Line Items]      
Premium revenue percentage 11.40%    
TEXAS      
Property, Plant and Equipment [Line Items]      
Premium revenue percentage 13.90%    
WASHINGTON      
Property, Plant and Equipment [Line Items]      
Premium revenue percentage 14.00%    
Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Minimum | Premium revenue      
Property, Plant and Equipment [Line Items]      
Revenue ranging 1.00%    
Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 16 years    
Maximum | Premium revenue      
Property, Plant and Equipment [Line Items]      
Revenue ranging 4.00%    
Structured Securities      
Property, Plant and Equipment [Line Items]      
Average maturity period (less than) 15 years