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Medical Claims Liability - Cumulative Incurred and Paid Claims (Details) - Health insurance product line - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Claims Development [Line Items]      
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net $ 298,416    
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net 281,844    
All outstanding liabilities prior to 2020, net of reinsurance 147    
Medical claims liability, net of reinsurance 16,719    
Short-Duration Insurance Contract, Accident Year 2020      
Claims Development [Line Items]      
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net 86,433 $ 86,502 $ 88,206
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net 86,021 85,593 $ 76,722
Short-Duration Insurance Contract, Accident Year 2021      
Claims Development [Line Items]      
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net 99,087 100,385  
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net 98,024 $ 87,427  
Short-Duration Insurance Contract, Accident Year 2022      
Claims Development [Line Items]      
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net 112,896    
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net $ 97,799