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Significant Accounting Policies - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Maturity period (less than) 10 years    
Average maturity period (less than) 10 years    
Interest receivable $ 11,000,000 $ 10,000,000  
Contingent consideration liabilities 47,000,000 46,000,000  
Impairment 0 0  
Marketplace risk adjustment payables 902,000,000 326,000,000  
Risk adjustment receivable 7,000,000 20,000,000  
Risk adjustment, net payable 895,000,000 306,000,000  
Prepaid reinsurance premiums 2,000,000 9,000,000 $ 17,000,000
Reinsurance recoveries 33,000,000 23,000,000 18,000,000
Reinsurance recoverable 51,000,000 30,000,000 $ 21,000,000
Level 3      
Property, Plant and Equipment [Line Items]      
Contingent consideration liabilities 47,000,000 46,000,000  
MMP plans      
Property, Plant and Equipment [Line Items]      
Reduction in premiums   564,000,000  
COVID-19      
Property, Plant and Equipment [Line Items]      
Reduction in premiums $ 323,000,000 $ 37,000,000  
Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Minimum | Premium revenue      
Property, Plant and Equipment [Line Items]      
Percentage of additional incremental revenue earned 1.00%    
Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 16 years    
Maximum | Premium revenue      
Property, Plant and Equipment [Line Items]      
Percentage of additional incremental revenue earned 4.00%