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Commitments, Contingent Liabilities and Litigation (Details) |  |  | 3 Months Ended | 5 Months Ended | 12 Months Ended | 37 Months Ended | 179 Months Ended |  |  |  |  |  |
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Apr. 30, 2023 USD ($) lawsuit | Jul. 31, 2014 | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) plaintiff | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) states numberOfUSTerritories | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) states | Jul. 31, 2024 USD ($) | Jun. 30, 2038 USD ($) | Aug. 08, 2024 lawsuit | Nov. 30, 2023 USD ($) | Oct. 31, 2022 USD ($) | Jul. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Apr. 30, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Related to Litigation Settlement |  |  | $ (80,000,000) | $ 11,000,000 | $ 41,000,000 | $ 76,000,000 | $ 207,000,000 | $ (25,000,000) |  |  | $ (78,000,000) | $ 304,000,000 | $ (94,000,000) |  |  |  |  |  |  |  |
Income from Settlements of Class Action Lawsuits |  |  |  |  |  |  |  |  |  |  | $ 117,000,000 | 130,000,000 | $ 18,000,000 |  |  |  |  |  |  |  |
CVS Health Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Purchase Commitment, Period |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pharmaceutical and Specialty Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Judgment for lost profits |  |  |  |  |  |  |  |  | $ 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Opioid Lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of State | states |  |  |  |  |  |  |  |  |  |  | 50 |  | 48 |  |  |  |  |  |  |  |
Settling U.S Territories | numberOfUSTerritories |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Payments for Legal Settlements |  |  | 239,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance Recoveries |  |  |  |  |  |  |  |  |  |  | $ 34,000,000 |  |  |  |  |  |  |  |  |  |
Opioid Lawsuits | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Legal Settlements |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900,000,000 | $ 4,400,000,000 |  |  |  |  |  |
Product Liability Lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  | 103,000,000 |  |  |  |  |  |  |  |  |
Product Liability Lawsuits | IVC April 2023 Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Legal Settlements |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | $ 275,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New York Opioid Stewardship Act |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Annual Assessment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000
Loss contingency accrual |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 | $ 20,000,000 |  |  |  |  |  |  | $ 41,000,000 |
Loss Contingency Accrual, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |
Loss Contingency Accrual, Payments |  |  |  |  |  |  |  |  | $ 20,000,000 |  |  | $ 11,000,000 |  |  |  |  |  |  |  |  |
WEST VIRGINIA | Opioid Lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 124,000,000 |  |
921150 American Indian and Alaska Native Tribal Governments | Opioid Lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 136,000,000 |  |  |
ALABAMA | Opioid Lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 123,000,000 |  |  |  |
Litigation Settlement, Loss |  |  |  |  |  |  |  |  |  |  | 22,000,000 |  |  |  |  |  |  |  |  |  |
Total Opioid Litigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  |  | 344,000,000 |  |  |  |  |  |  |  | 344,000,000 |  |  |  |  |  |  |  |  |  |
Estimated Litigation Liability |  |  |  |  |  |  |  |  |  |  | 5,400,000,000 |  |  |  |  |  |  |  |  |  |
Estimated Litigation Liability, Current |  |  |  |  |  |  |  |  |  |  | 643,000,000 |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,630,000,000 |  |  |  |  |  |  |  |
Litigation Settlement, Loss |  |  |  |  |  |  |  |  |  |  | 340 |  |  |  |  |  |  |  |  |  |
Income As A Result Of Prepayments |  |  | $ 105,000,000 |  |  |  |  |  |  |  | 105,000,000 |  |  |  |  |  |  |  |  |  |
Private Parties [Member] | Opioid Lawsuits | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Lawsuits, Number | lawsuit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 371 |  |  |  |  |
Private Parties [Member] | GEORGIA | Opioid Lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  |  |  |  |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Action Lawsuits [Member] | Private Parties [Member] | Opioid Lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Litigation Liability |  |  |  |  |  |  |  |  |  |  | 213,000,000 |  |  |  |  |  |  |  |  |  |
Class Action Lawsuits [Member] | Private Parties [Member] | Opioid Lawsuits | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Lawsuits, Number | lawsuit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98 |  |  |  |  |
Product Liability Lawsuits | IVC April 2023 Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Settled, Number | lawsuit | 4,375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Liability Lawsuits | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  |  |  | $ 291,000,000 |  |  |  |  |  |  |  |  |  |

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