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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, 2025
USD ($)
claim
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 404,815    
Medicaid | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 241,851    
Medicare | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 74,497    
Commercial | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 83,149    
Other | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 5,318    
2023      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 118,324 $ 118,709 $ 120,680
Total IBNR Plus Expected Development on Reported Claims $ 4    
Cumulative Paid Claims | claim 624.1    
2023 | Medicaid | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 78,282 78,517 79,747
Total IBNR Plus Expected Development on Reported Claims $ 4    
Cumulative Paid Claims | claim 346.0    
2023 | Medicare | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 18,830 19,008 19,487
Total IBNR Plus Expected Development on Reported Claims $ 0    
Cumulative Paid Claims | claim 200.7    
2023 | Commercial | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 19,725 19,698 19,966
Total IBNR Plus Expected Development on Reported Claims $ 0    
Cumulative Paid Claims | claim 72.9    
2023 | Other | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 1,487 1,486 $ 1,480
Total IBNR Plus Expected Development on Reported Claims $ 0    
Cumulative Paid Claims | claim 4.5    
2024      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 126,382 128,312  
Total IBNR Plus Expected Development on Reported Claims $ 347    
Cumulative Paid Claims | claim 665.0    
2024 | Medicaid | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 77,872 78,885  
Total IBNR Plus Expected Development on Reported Claims $ 155    
Cumulative Paid Claims | claim 317.9    
2024 | Medicare | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 20,798 21,171  
Total IBNR Plus Expected Development on Reported Claims $ 82    
Cumulative Paid Claims | claim 255.1    
2024 | Commercial | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 26,027 26,548  
Total IBNR Plus Expected Development on Reported Claims $ 107    
Cumulative Paid Claims | claim 86.4    
2024 | Other | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 1,685 $ 1,708  
Total IBNR Plus Expected Development on Reported Claims $ 3    
Cumulative Paid Claims | claim 5.6    
2025      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 160,109    
Total IBNR Plus Expected Development on Reported Claims $ 13,125    
Cumulative Paid Claims | claim 709.9    
2025 | Medicaid | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 85,697    
Total IBNR Plus Expected Development on Reported Claims $ 7,244    
Cumulative Paid Claims | claim 308.1    
2025 | Medicare | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 34,869    
Total IBNR Plus Expected Development on Reported Claims $ 1,567    
Cumulative Paid Claims | claim 282.8    
2025 | Commercial | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 37,397    
Total IBNR Plus Expected Development on Reported Claims $ 4,242    
Cumulative Paid Claims | claim 112.5    
2025 | Other | Operating Segments      
Claims Development [Line Items]      
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,146    
Total IBNR Plus Expected Development on Reported Claims $ 72    
Cumulative Paid Claims | claim 6.5