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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
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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 |  |  |  |  |  |

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