v3.26.1
Significant Accounting Policies - Narrative (Details)
store in Thousands, clinic in Thousands, people in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
store
people
state
clinic
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2026
USD ($)
store
people
segment
clinic
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
program
Significant Accounting Policies [Line Items]              
Number of pharmacy plan members | people 87     87      
Number of reportable segments | segment       4      
Allowance for credit losses $ 169     $ 169   $ 182  
Loss on Accountable Care assets   $ 41     $ 288    
Pre-tax loss on divestiture       $ 0 236    
Medicaid Product Line              
Significant Accounting Policies [Line Items]              
Premium deficiency reserve $ 15            
Premium deficiency reserve, number of states | state 1            
Individual Exchange Product Line              
Significant Accounting Policies [Line Items]              
Premium deficiency reserve     $ 448        
Individual Exchange Product Line | Location, Statement of Income, Balance [Axis]: us-gaap:OtherCostAndExpenseOperating              
Significant Accounting Policies [Line Items]              
Premium deficiency reserve     17        
Individual Exchange Product Line | Location, Statement of Income, Balance [Axis]: us-gaap:PolicyholderBenefitsAndClaimsIncurredNet              
Significant Accounting Policies [Line Items]              
Premium deficiency reserve     $ 431        
Group Medicare Advantage Product Line              
Significant Accounting Policies [Line Items]              
Premium deficiency reserve   471          
Pharmacy & Consumer Wellness              
Significant Accounting Policies [Line Items]              
Number of retail locations | store 9     9      
Health Services              
Significant Accounting Policies [Line Items]              
Number of walk in medical clinics (more than) | clinic 1     1      
Number of programs administered | program             2
Loss on Accountable Care assets   41     288    
Loss on termination of program   $ 41     52    
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 | people 37     37