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Medical Costs Payable, Incurred and Paid Medical Cost Development (Details) - Health Insurance Product Line [Member] - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Net Incurred Medical Costs $ 347,771  
Net Cumulative Medical Payments (323,706)  
Net remaining outstanding liabilities prior to 2020 418  
Total Medical costs payable 24,483  
Short-duration Insurance Contracts, Accident Year 2020 [Member]    
Net Incurred Medical Costs 159,140 $ 160,276
Net Cumulative Medical Payments (158,182) $ (139,974)
Short-duration Insurance Contracts, Accident Year 2021 [Member]    
Net Incurred Medical Costs 188,631  
Net Cumulative Medical Payments $ (165,524)