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Significant Accounting Policies - Narrative (Details)
shares in Millions, people in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2023
state
Oct. 31, 2020
USD ($)
Dec. 31, 2022
USD ($)
people
store
clinic
patient
state
shares
Dec. 31, 2021
USD ($)
store
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2022
USD ($)
state
people
store
clinic
patient
Segment
shares
Dec. 31, 2021
USD ($)
store
shares
Dec. 31, 2020
USD ($)
shares
Aug. 31, 2019
USD ($)
Significant Accounting Policies [Line Items]                  
Number of pharmacy plan members | people     110     110      
Number of patients served per year (more than) | patient     1,000,000     1,000,000      
Number of people served | people     35     35      
Number of reportable segments | Segment           4      
Deferred acquisition costs     $ 1,219,000,000 $ 879,000,000   $ 1,219,000,000 $ 879,000,000 $ 519,000,000  
Depreciation           2,400,000,000 2,300,000,000 2,100,000,000  
Office real estate optimization charges     117,000,000     117,000,000 0 0  
Store impairment charges           0 $ 1,358,000,000 0  
Number of stores, planned closure | store             900    
Goodwill impairment           0 $ 431,000,000 0  
Impairment of intangible assets, indefinite-lived           0 0 0  
HSA balances     0 2,900,000,000   0 2,900,000,000    
Self insurance liabilities     $ 1,100,000,000 $ 1,100,000,000   $ 1,100,000,000 1,100,000,000    
Pharmacy rebate period           30 days      
Health insurer fee           $ 0 0 1,000,000,000  
Advertising costs           $ 745,000,000 $ 707,000,000 $ 613,000,000  
Treasury shares held in trust (in shares) | shares     1 1   1 1 1  
Expenses from transactions with related party           $ 60,000,000 $ 52,000,000 $ 56,000,000  
Other revenues from transactions with related party           87,000,000 79,000,000 77,000,000  
Charitable contribution to CVS Health Foundation           $ 25,000,000 50,000,000 50,000,000  
Long-Term Care Reporting Unit                  
Significant Accounting Policies [Line Items]                  
Goodwill impairment         $ 431,000,000        
U.S. Department of Health and Human Services, ACA Risk Corridor Receivables | Settled Litigation                  
Significant Accounting Policies [Line Items]                  
Gain contingency, unrecorded amount               313,000,000 $ 313,000,000
Amount awarded from other party   $ 313,000,000              
Former gain contingency, recognized in current period, before tax               307,000,000  
Former gain contingency, recognized in current period, net of tax               223,000,000  
Heartland Healthcare Services                  
Significant Accounting Policies [Line Items]                  
Number of states in which entity operates | state     4     4      
Other Insurance Liabilities                  
Significant Accounting Policies [Line Items]                  
Liability for unpaid claims     $ 243,000,000 $ 324,000,000   $ 243,000,000 324,000,000    
Liability for future policy benefits     334,000,000 458,000,000   334,000,000 458,000,000    
Other Long-Term Insurance Liabilities                  
Significant Accounting Policies [Line Items]                  
Liability for unpaid claims     1,100,000,000 1,300,000,000   1,100,000,000 1,300,000,000    
Liability for future policy benefits     4,700,000,000 6,000,000,000   $ 4,700,000,000 $ 6,000,000,000    
Property and equipment                  
Significant Accounting Policies [Line Items]                  
Office real estate optimization charges     $ 44,000,000            
Minimum                  
Significant Accounting Policies [Line Items]                  
Period after date of service a claim is paid           6 months      
Interest rate for pension and annuity investment contracts           3.50% 3.50%    
Award vesting period           3 years      
Minimum | Buildings, building improvements and leasehold improvements                  
Significant Accounting Policies [Line Items]                  
Useful life of property plant and equipment           1 year      
Minimum | Fixtures, equipment and internally developed software                  
Significant Accounting Policies [Line Items]                  
Useful life of property plant and equipment           3 years      
Maximum                  
Significant Accounting Policies [Line Items]                  
Lease renewal term           5 years      
Period after date of service a claim is paid           48 months      
Interest rate for pension and annuity investment contracts           4.80% 4.80%    
Award vesting period           5 years      
Maximum | Buildings, building improvements and leasehold improvements                  
Significant Accounting Policies [Line Items]                  
Useful life of property plant and equipment           40 years      
Maximum | Fixtures, equipment and internally developed software                  
Significant Accounting Policies [Line Items]                  
Useful life of property plant and equipment           10 years      
Pharmacy & Consumer Wellness                  
Significant Accounting Policies [Line Items]                  
Number of retail locations (more than) | store     9,000     9,000      
Goodwill impairment             $ 431,000,000    
Health Services                  
Significant Accounting Policies [Line Items]                  
Number of walk-in medical clinics (more than) | clinic     1,100     1,100      
Goodwill impairment             0    
Health Care Benefits                  
Significant Accounting Policies [Line Items]                  
Number of states in which the Company has entered the individual public health insurance exchange | state           8      
Goodwill impairment             0    
Health Care Benefits | Forecast                  
Significant Accounting Policies [Line Items]                  
Additional number of states in which the Company entered the individual public health insurance exchange | state 4                
Retail LTC                  
Significant Accounting Policies [Line Items]                  
Store impairment charges       $ 1,400,000,000     $ 1,400,000,000    
Number of stores, planned closure | store       900     900    
Retail LTC | Property and equipment                  
Significant Accounting Policies [Line Items]                  
Store impairment charges       $ 261,000,000     $ 261,000,000    
Health Insurance Product Line                  
Significant Accounting Policies [Line Items]                  
Premium deficiency reserve     $ 0 $ 16,000,000   $ 0 $ 16,000,000 $ 11,000,000