v3.26.1
Significant Accounting Policies - Narrative (Details)
store in Thousands, clinic in Thousands, people in Millions, $ in Millions
3 Months Ended
Mar. 31, 2026
USD ($)
people
clinic
store
segment
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
program
Significant Accounting Policies [Line Items]        
Number of pharmacy plan members | people 88      
Number of reportable segments | segment 4      
Allowance for credit losses $ 200   $ 182  
Premium deficiency reserve charge 0      
Loss on Accountable Care assets   $ 247    
Pre-tax loss on divestiture $ 0 236    
Individual Exchange Product Line        
Significant Accounting Policies [Line Items]        
Premium deficiency reserve charge   448    
Individual Exchange Product Line | Other Cost And Expense, Operating        
Significant Accounting Policies [Line Items]        
Premium deficiency reserve charge   17    
Individual Exchange Product Line | Policyholder Benefits And Claims Incurred, Net        
Significant Accounting Policies [Line Items]        
Premium deficiency reserve charge   431    
Pharmacy & Consumer Wellness        
Significant Accounting Policies [Line Items]        
Number of retail locations | store 9      
Health Services        
Significant Accounting Policies [Line Items]        
Number of walk in medical clinics (more than) | clinic 1      
Number of programs administered | program       2
Loss on Accountable Care assets   247    
Loss on termination of program   11    
Health Services | Disposal Group, Disposed of by Sale, Not Discontinued Operations | MSSP        
Significant Accounting Policies [Line Items]        
Pre-tax loss on divestiture   236    
Intangible assets and goodwill removed due to divestiture   $ 342    
Health Care Benefits        
Significant Accounting Policies [Line Items]        
Number of people served (more than) | people 37