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Medical Claims Liability - Schedule of Cumulative Incurred and Paid Claims (Details) - Health insurance product line - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 404,815    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 384,436    
All outstanding liabilities prior to 2023, net of reinsurance 290    
Magellan Health medical claims liabilities held for sale (109)    
Medical claims liability, net of reinsurance 20,560    
2023      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 118,324 $ 118,709 $ 120,680
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 118,114 117,635 104,725
2024      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 126,382 128,312  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 125,631 111,456  
2025      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 160,109    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 140,691    
Medicaid | Operating Segments      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 241,851    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 231,593    
All outstanding liabilities prior to 2023, net of reinsurance 101    
Medical claims liability, net of reinsurance 10,359    
Medicaid | Operating Segments | 2023      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 78,282 78,517 79,747
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 78,194 77,952 69,904
Medicaid | Operating Segments | 2024      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 77,872 78,885  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 77,527 69,351  
Medicaid | Operating Segments | 2025      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 85,697    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 75,872    
Medicare | Operating Segments      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 74,497    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 70,108    
All outstanding liabilities prior to 2023, net of reinsurance 104    
Medical claims liability, net of reinsurance 4,493    
Medicare | Operating Segments | 2023      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 18,830 19,008 19,487
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 18,783 18,778 16,631
Medicare | Operating Segments | 2024      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 20,798 21,171  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 20,674 18,036  
Medicare | Operating Segments | 2025      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 34,869    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 30,651    
Commercial | Operating Segments      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 83,149    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 77,611    
All outstanding liabilities prior to 2023, net of reinsurance 85    
Medical claims liability, net of reinsurance 5,623    
Commercial | Operating Segments | 2023      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 19,725 19,698 19,966
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 19,650 19,420 16,823
Commercial | Operating Segments | 2024      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 26,027 26,548  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 25,748 22,547  
Commercial | Operating Segments | 2025      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 37,397    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 32,213    
Other | Operating Segments      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 5,318    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 5,124    
All outstanding liabilities prior to 2023, net of reinsurance 0    
Magellan Health medical claims liabilities held for sale (109)    
Medical claims liability, net of reinsurance 85    
Other | Operating Segments | 2023      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,487 1,486 1,480
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,487 1,485 $ 1,367
Other | Operating Segments | 2024      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,685 1,708  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,682 $ 1,522  
Other | Operating Segments | 2025      
Claims Development [Line Items]      
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,146    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 1,955