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Medical Claims and Benefits Payable - Incurred Claims and Allocated Adjustment Expense (Details)
claim in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
claim
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 28,669 $ 27,175 $ 23,704
Incurred Claims and Allocated Claims Adjustment Expenses 80,136    
Total IBNP 2,898    
Benefit Year 2021      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses 23,912 23,979 $ 24,167
Total IBNP $ 18    
Cumulative number of reported claims (in claim) | claim 133    
Benefit Year 2022      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 27,128 $ 27,459  
Total IBNP $ 77    
Cumulative number of reported claims (in claim) | claim 163    
Benefit Year 2023      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 29,096    
Total IBNP $ 2,803    
Cumulative number of reported claims (in claim) | claim 153