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Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Schedule of Premium Revenue by Health Plan Type [Line Items]          
Risk adjustment payable $ 1,037   $ 1,037   $ 902
Risk adjustment receivable 61   61   7
Risk adjustment, net payable (976)   $ (976)   $ 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 $ 94 $ 56 $ 122 $ 166