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Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Schedule of Premium Revenue by Health Plan Type [Line Items]          
Risk adjustment payable $ 179   $ 179   $ 902
Risk adjustment receivable 94   94   7
Risk adjustment, net payable 85   $ 85   $ 895
Maturity period (less than)     15 years    
Structured Securities          
Schedule of Premium Revenue by Health Plan Type [Line Items]          
Average maturity period (less than)     15 years    
COVID-19          
Schedule of Premium Revenue by Health Plan Type [Line Items]          
Reduction in premiums $ 34 $ 17 $ 156 $ 183