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Medical Claims Liability - Schedule of Incurred Claims and Allocated Claims Adjustment Expenses (Details) - Health insurance product line
claim in Millions, $ in Millions
Dec. 31, 2024
USD ($)
claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 357,415    
Medicaid | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 232,124    
Medicare | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 59,206    
Commercial | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 60,116    
Other | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 5,969    
2022      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 110,394 $ 110,870 $ 112,896
Total IBNR Plus Expected Development on Reported Claims $ 3    
Cumulative Paid Claims | claim 638.0    
2022 | Medicaid | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 74,722 74,861 76,344
Total IBNR Plus Expected Development on Reported Claims $ 3    
Cumulative Paid Claims | claim 370.9    
2022 | Medicare | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 19,027 19,124 19,475
Total IBNR Plus Expected Development on Reported Claims $ 0    
Cumulative Paid Claims | claim 204.8    
2022 | Commercial | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 13,870 14,110 14,296
Total IBNR Plus Expected Development on Reported Claims $ 0    
Cumulative Paid Claims | claim 57.5    
2022 | Other | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,775 2,775 $ 2,781
Total IBNR Plus Expected Development on Reported Claims $ 0    
Cumulative Paid Claims | claim 4.8    
2023      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 118,709 120,680  
Total IBNR Plus Expected Development on Reported Claims $ 383    
Cumulative Paid Claims | claim 623.6    
2023 | Medicaid | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 78,517 79,747  
Total IBNR Plus Expected Development on Reported Claims $ 218    
Cumulative Paid Claims | claim 345.6    
2023 | Medicare | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 19,008 19,487  
Total IBNR Plus Expected Development on Reported Claims $ 102    
Cumulative Paid Claims | claim 200.6    
2023 | Commercial | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 19,698 19,966  
Total IBNR Plus Expected Development on Reported Claims $ 62    
Cumulative Paid Claims | claim 72.9    
2023 | Other | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 1,486 $ 1,480  
Total IBNR Plus Expected Development on Reported Claims $ 1    
Cumulative Paid Claims | claim 4.5    
2024      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 128,312    
Total IBNR Plus Expected Development on Reported Claims $ 12,079    
Cumulative Paid Claims | claim 641.3    
2024 | Medicaid | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 78,885    
Total IBNR Plus Expected Development on Reported Claims $ 6,968    
Cumulative Paid Claims | claim 300.1    
2024 | Medicare | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 21,171    
Total IBNR Plus Expected Development on Reported Claims $ 1,724    
Cumulative Paid Claims | claim 253.0    
2024 | Commercial | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 26,548    
Total IBNR Plus Expected Development on Reported Claims $ 3,211    
Cumulative Paid Claims | claim 83.0    
2024 | Other | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 1,708    
Total IBNR Plus Expected Development on Reported Claims $ 176    
Cumulative Paid Claims | claim 5.2