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Commitments and Contingent Liabilities - Narrative (Details) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Apr. 27, 2022 USD ($) | Oct. 08, 2021 plaintiff | May 17, 2013 USD ($) | Sep. 30, 2024 USD ($) case state distributor settlement subdivision | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) case state distributor subdivision | Sep. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) plaintiff | Jul. 31, 2020 state | Aug. 13, 2019 fax faxNumber
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Claims and litigation charges |  |  |  | $ (4,000,000) | $ (2,000,000) | $ 108,000,000 | $ (2,000,000) |  |  |
Number of plaintiffs | plaintiff |  | 2 |  |  |  |  |  |  |  |
Proceeds from legal settlements |  |  |  | $ 63,000,000 |  |  |  |  |  |
Number of antitrust settlement | settlement |  |  |  | 2 |  |  |  |  |  |
U.S. Pharmaceutical |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from legal settlements |  |  |  | $ 63,000,000 | $ 79,000,000 | 153,000,000 | $ 197,000,000 |  |  |
National Prescription Opioid Litigation |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Claims and litigation charges |  |  |  |  |  | 114,000,000 |  | $ 149,000,000 |  |
National Prescription Opioid Litigation | Corporate Segment and U.S. Pharmaceutical Segment |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Claims and litigation charges |  |  |  |  |  | $ 57,000,000 |  |  |  |
National Prescription Opioid Litigation | U.S. Pharmaceutical |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Claims and litigation charges |  |  |  |  |  |  |  | (74,000,000) |  |
National Prescription Opioid Litigation | Corporate |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Claims and litigation charges |  |  |  |  |  |  |  | $ (75,000,000) |  |
National Prescription Opioid Litigation | United States |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity | case |  |  |  | 400 |  | 400 |  |  |  |
National Prescription Opioid Litigation | Canada |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity | case |  |  |  | 4 |  | 4 |  |  |  |
National Prescription Opioid Litigation | An individual | United States |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity | case |  |  |  | 1 |  | 1 |  |  |  |
National Prescription Opioid Litigation | An individual | Canada |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity | case |  |  |  | 1 |  | 1 |  |  |  |
National Prescription Opioid Litigation |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of other national distributors named in suit | distributor |  |  |  | 2 |  | 2 |  |  |  |
Number of states in which court cases are pending | state |  |  |  | 48 |  | 48 |  |  |  |
Loss contingency, number of cases dismissed | case |  |  |  | 2,300 |  | 2,300 |  |  |  |
Portion of settlement award to be used by state and local government for remediation (percent) |  |  |  | 85.00% |  | 85.00% |  |  |  |
Loss contingency, claims settled, number of jurisdictions not participating in settlement | subdivision |  |  |  | 1 |  | 1 |  |  |  |
Number of plaintiffs | plaintiff |  |  |  |  |  |  |  | 1 |  |
National Prescription Opioid Litigation | State of Alabama and Subdivisions |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement payment |  |  |  |  |  | $ 75,000,000 |  |  |  |
Award payable under proposed framework |  |  |  |  |  | $ 99,000,000 |  |  |  |
National Prescription Opioid Litigation | Native American Tribes Other Than Cherokee Nation |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party, percentage of total settlement to be used to remediate damages |  |  |  | 0.85 |  | 0.85 |  |  |  |
National Prescription Opioid Litigation | Settling Governmental Entities and Cherokee Nation | Settled Litigation |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement payment |  |  |  |  |  | $ 500,000,000 |  |  |  |
National Prescription Opioid Litigation | Three Largest U.S. Pharmaceutical Distributors |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement payment |  |  |  |  |  | 2,000,000,000 |  |  |  |
Award payable under proposed framework |  |  |  |  |  | 5,900,000,000 |  |  |  |
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | State of West Virginia and Subdivisions |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement payment |  |  |  |  |  | 53,000,000 |  |  |  |
Award payable under proposed framework |  |  |  |  |  | 99,000,000 |  |  |  |
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | Cherokee Nation |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement payment |  |  |  |  |  | 112,000,000 |  |  |  |
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | Native American Tribes Other Than Cherokee Nation |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  |  |  |  |  | $ 84,000,000 |  |  |  |
United States ex rel. Hart v. McKesson Corporation, et al., 15-cv-00903-RA |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of states filed on behalf of | state |  |  |  |  |  |  |  |  | 27 |
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency, class action, number of faxes remaining in the class | faxNumber |  |  |  |  |  |  |  |  |  | 9,490
Loss contingency, class action, number of faxes received | fax |  |  |  |  |  |  |  |  |  | 48,769
Amounts awarded to plaintiff | $ 6,500 |  |  |  |  |  |  |  |  |
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al | Minimum |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought per violation, value |  |  | $ 500 |  |  |  |  |  |  |
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al | Maximum |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought per violation, value |  |  | $ 1,500 |  |  |  |  |  |  |

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