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Medical Claims Liability - Incurred Claims and Allocated Claims Adjustment Expenses (Details) - Health insurance product line
claim in Millions, $ in Millions
Dec. 31, 2022
USD ($)
claim
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Claims Development [Line Items]      
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net $ 298,416    
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, expected development on reported claims $ 0    
Short-duration Insurance contracts, number of reported claims | claim 568.8    
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, expected development on reported claims $ 273    
Short-duration Insurance contracts, number of reported claims | claim 623.2    
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, expected development on reported claims $ 11,081    
Short-duration Insurance contracts, number of reported claims | claim 608.1