v3.26.3
Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2026
Mar. 31, 2026
Sep. 30, 2026
Dec. 31, 2025
Property, Plant, and Equipment [Line Items]        
Receivables     $ 3,359 $ 3,533
Minimum MLR, medical cost corridors and profit sharing liability     $ 453 $ 457
Percent due to Medicare, medical loss ratio     85.00% 85.00%
Government agencies liability     $ 40 $ 28
Percent due to medicare, medical loss ratio of marketplace     80.00% 80.00%
Medical loss ratio of marketplace     $ 0 $ 12
Risk adjustments liability     105 66
Risk adjustment receivable (payable)     (192) (517)
Risk adjustment receivable     114 106
Risk adjustment, net receivable (payable)     $ (78) (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     $ 2,274 $ 2,365