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Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Schedule of Premium Revenue by Health Plan Type [Line Items]    
Risk adjustment payable $ 312 $ 230
Risk adjustment receivable 249 135
Risk adjustment, net payable $ 63 $ 95
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