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Significant Accounting Policies - Narrative (Details)
store in Thousands, clinic in Thousands, people in Millions, patient in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
clinic
people
patient
store
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
segment
clinic
people
patient
store
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
program
Significant Accounting Policies [Line Items]            
Number of pharmacy plan members | people 87     87    
Number of patients served per year (more than) | patient 0.8     0.8    
Number of reportable segments | segment       4    
Allowance for credit losses $ 374     $ 374   $ 407
Total premium deficiency reserve     $ 0   $ 0  
Premium deficiency reserve 902   $ 0 902 0  
Loss on Accountable Care assets 41     288    
Pre-tax loss on divestiture       (236) $ 0  
Individual Exchange Product Line            
Significant Accounting Policies [Line Items]            
Total premium deficiency reserve   $ 448        
Premium deficiency reserve, charge of unamortized acquisition costs   17        
Premium deficiency reserve, charge to health care costs   $ 431        
Premium deficiency reserve 431     431    
Group Medicare Advantage Product Line            
Significant Accounting Policies [Line Items]            
Total premium deficiency reserve 471          
Premium deficiency reserve $ 471     $ 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 (more than) | people 37     37