v3.26.1
Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Feb. 28, 2026
Mar. 31, 2026
Dec. 31, 2025
Property, Plant and Equipment [Line Items]      
Receivables   $ 3,420 $ 3,533
Minimum MLR, medical cost corridors and profit sharing liability   $ 531 $ 457
Percent due to medicare, medical loss ratio   85.00% 85.00%
Government agencies liability   $ 45 $ 28
Percent due to medicare, medical loss ratio of marketplace   80.00% 80.00%
Medical loss ratio of marketplace   $ 8 $ 12
Risk adjustments liability   65 66
Risk adjustment receivable (payable)   (630) (517)
Risk adjustment receivable   112 106
Risk adjustment, net receivable (payable)   $ (518) (411)
Maturity period (less than)   15 years  
Remaining intangible assets $ 93    
Contract Rights and Licensing Agreements      
Property, Plant and Equipment [Line Items]      
Remaining intangible assets 62    
Provider Networks      
Property, Plant and Equipment [Line Items]      
Remaining intangible assets 4    
Trade name      
Property, Plant and Equipment [Line Items]      
Remaining intangible assets $ 27    
Structured Securities      
Property, Plant and Equipment [Line Items]      
Average maturity period (less than)   15 years  
Government Receivables      
Property, Plant and Equipment [Line Items]      
Receivables   $ 2,380 $ 2,365