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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, 2024
USD ($)
claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 34,428 $ 28,669 $ 27,175
Incurred Claims and Allocated Claims Adjustment Expenses 90,773    
Total IBNP 3,083    
Benefit Year 2022      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses 27,036 27,128 $ 27,459
Total IBNP $ 13    
Cumulative number of reported claims (in claim) | claim 148    
Benefit Year 2023      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 28,634 $ 29,192  
Total IBNP $ 52    
Cumulative number of reported claims (in claim) | claim 157    
Benefit Year 2024      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 35,103    
Total IBNP $ 3,018    
Cumulative number of reported claims (in claim) | claim 158