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Medical Claims Liability - Schedule of Cumulative Incurred and Paid Claims (Details) - Health insurance product line - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 357,415    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 339,188    
All outstanding liabilities prior to 2022, net of reinsurance 174    
Medical claims liability, net of reinsurance 18,401    
2022      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 110,394 $ 110,870 $ 112,896
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 110,097 109,680 97,799
2023      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 118,709 120,680  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 117,635 104,725  
2024      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 128,312    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 111,456    
Medicaid | Operating Segments      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 232,124    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 221,911    
All outstanding liabilities prior to 2022, net of reinsurance 68    
Medical claims liability, net of reinsurance 10,281    
Medicaid | Operating Segments | 2022      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 74,722 74,861 76,344
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 74,608 74,125 66,220
Medicaid | Operating Segments | 2023      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 78,517 79,747  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 77,952 69,904  
Medicaid | Operating Segments | 2024      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 78,885    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 69,351    
Medicare | Operating Segments      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 59,206    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 55,756    
All outstanding liabilities prior to 2022, net of reinsurance 66    
Medical claims liability, net of reinsurance 3,516    
Medicare | Operating Segments | 2022      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 19,027 19,124 19,475
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 18,942 18,818 16,276
Medicare | Operating Segments | 2023      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 19,008 19,487  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 18,778 16,631  
Medicare | Operating Segments | 2024      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 21,171    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 18,036    
Commercial | Operating Segments      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 60,116    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 55,740    
All outstanding liabilities prior to 2022, net of reinsurance 40    
Medical claims liability, net of reinsurance 4,416    
Commercial | Operating Segments | 2022      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 13,870 14,110 14,296
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 13,773 13,963 12,556
Commercial | Operating Segments | 2023      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 19,698 19,966  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 19,420 16,823  
Commercial | Operating Segments | 2024      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 26,548    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 22,547    
Other | Operating Segments      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 5,969    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 5,781    
All outstanding liabilities prior to 2022, net of reinsurance 0    
Medical claims liability, net of reinsurance 188    
Other | Operating Segments | 2022      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,775 2,775 2,781
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,774 2,774 $ 2,747
Other | Operating Segments | 2023      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,486 1,480  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,485 $ 1,367  
Other | Operating Segments | 2024      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,708    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 1,522