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Significant Accounting Policies - Narrative (Details)
shares in Millions, people in Millions, patient in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2024
state
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
store
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2023
USD ($)
store
clinic
people
patient
state
business
Segment
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
store
shares
Significant Accounting Policies [Line Items]              
Number of pharmacy plan members | people         108    
Number of patients served per year (more than) | patient         1    
Number of businesses acquired | business         2    
Number of reportable segments | Segment         4    
Depreciation         $ 2,500 $ 2,400 $ 2,300
Office real estate optimization charges   $ 117     46 117 0
Store impairments         0 0 $ 1,358
Number of stores, planned closure | store             900
Goodwill impairment         0 0 $ 431
Impairment of intangible assets, indefinite-lived         0 0 0
Premium deficiency reserve   0     0 0  
Self insurance liabilities   1,100     1,100 1,100  
ACA risk adjustment payable   $ 0     $ 1,200 0  
Pharmacy rebate period         30 days    
Advertising costs         $ 985 $ 745 $ 707
Treasury shares held in trust (in shares) | shares   1 1   1 1 1
Charitable contribution to CVS Health Foundation         $ 0 $ 25 $ 50
Client Health Information Network Services, Fees Expensed              
Significant Accounting Policies [Line Items]              
Transactions with related party         59 60 52
Pharmaceutical Inventory Purchases, Payments Received              
Significant Accounting Policies [Line Items]              
Transactions with related party         35 87 79
Health Insurance Product Line              
Significant Accounting Policies [Line Items]              
Premium deficiency reserve   $ 0 $ 16     0 16
Other Insurance Liabilities              
Significant Accounting Policies [Line Items]              
Liability for unpaid claims   243     285 243  
Liability for future policy benefits   334     393 334  
Other Long-Term Insurance Liabilities              
Significant Accounting Policies [Line Items]              
Liability for unpaid claims   1,100     834 1,100  
Liability for future policy benefits   $ 4,700     $ 4,600 $ 4,700  
Long-Term Care Reporting Unit              
Significant Accounting Policies [Line Items]              
Goodwill impairment       $ 431      
Minimum              
Significant Accounting Policies [Line Items]              
Period after date of service a claim is paid         6 months    
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    
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    
Store impairments     $ 1,400       $ 1,400
Number of stores, planned closure | store     900       900
Health Services              
Significant Accounting Policies [Line Items]              
Number of walk-in medical clinics (more than) | clinic         1,000    
Number of primary care medical clinics | clinic         204    
Health Care Benefits              
Significant Accounting Policies [Line Items]              
Number of people served (more than) | people         35    
Number of states in which the Company has entered the individual public health insurance exchange | state         12    
Health Care Benefits | Subsequent Event              
Significant Accounting Policies [Line Items]              
Additional number of states in which the Company entered the individual public health insurance exchange | state 5