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Commitments and Contingent Liabilities - Narrative (Details) |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Jul. 05, 2022 USD ($) | Jun. 27, 2022 USD ($) | May 03, 2022 USD ($) | Apr. 27, 2022 USD ($) | Apr. 02, 2022 USD ($) distributor installment state | Sep. 28, 2021 USD ($) | Dec. 09, 2019 city state | May 17, 2013 USD ($) | Jul. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jul. 31, 2020 state | Jun. 30, 2022 USD ($) case | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) | Aug. 13, 2019 faxNumber fax | Apr. 30, 2018 USD ($)
National Prescription Opioid Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total litigation liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 7,891,000,000 |  | $ 8,266,000,000 |  |
Opioid Stewardship Act, State of New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opioid stewardship act, new york, annual surcharge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000
Charge recorded related to Company's share of the litigation settlement |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |
Loss contingency accrual, provision, after tax |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,000,000 |  |  |
Loss contingency accrual, payments |  |  |  |  |  |  |  |  |  | $ 26,000,000 |  |  |  |  |  |
National Prescription Opioid Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other national distributors named in suit | distributor |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Number of states in which court cases are pending | state |  |  |  |  | 46 |  |  |  |  |  |  |  |  |  |  |
Number of eligible states | state |  |  |  |  | 49 |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  |  |  |  | $ 7,400,000,000 |  |  |  |  |  |  |  |  |  |  |
Portion of settlement to be paid by the Company (percent) |  |  |  |  | 38.10% |  |  |  |  |  |  |  |  |  |  |
Portion of settlement award to be used by state and local government for remediation (percent) |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |
National Prescription Opioid Litigation | Cherokee Nation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  |  |  |  |  | $ 29,000,000 |  |  |  |  |  |  |  |  |  |
Portion of settlement to be paid by the Company (percent) |  |  |  |  |  | 38.10% |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement, installment payments, term |  |  |  |  |  | 6 years 6 months |  |  |  |  |  |  |  |  |  |
National Prescription Opioid Litigation | Native American Tribes Other Than Cherokee Nation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  |  |  |  |  | $ 167,000,000 |  |  |  |  |  |  |  |  |  |
Portion of settlement to be paid by the Company (percent) |  |  |  |  |  | 38.10% |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement, installment payments, term |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party, percentage of total settlement to be used to remediate damages |  |  |  |  |  | 0.85 |  |  |  |  |  |  |  |  |  |
National Prescription Opioid Litigation | State of West Virginia and Subdivisions | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework | $ 152,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 (per violation) |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought per violation, value (per violation) |  |  |  |  |  |  |  | $ 1,500 |  |  |  |  |  |  |  |
United States ex rel. Hart v. McKesson Corporation, et al., 15-cv-00903-RA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of states filed on behalf of | state |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |  |
United States ex rel. Omni Healthcare, Inc. v. US Oncology, Inc., 19-cv-05125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of states filed on behalf of | state |  |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |
Loss contingency number of cities filed on behalf of | city |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Canada | National Prescription Opioid Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity | case |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
Canada | National Prescription Opioid Litigation | Governmental entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity | case |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Canada | National Prescription Opioid Litigation | An individual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity | case |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Three Largest U.S. Pharmaceutical Distributors | National Prescription Opioid Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  |  |  |  | $ 19,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Period over which award would be payable under proposed framework |  |  |  |  | 18 years |  |  |  |  |  |  |  |  |  |  |
Three National Pharmaceutical Distributors | National Prescription Opioid Litigation | Cherokee Nation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  |  |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |
Three National Pharmaceutical Distributors | National Prescription Opioid Litigation | Native American Tribes Other Than Cherokee Nation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  |  |  |  |  | $ 440,000,000 |  |  |  |  |  |  |  |  |  |
Three National Pharmaceutical Distributors | National Prescription Opioid Litigation | State of West Virginia and Subdivisions | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of settlement to be paid by the Company (percent) | 38.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement, installment payments, term | 11 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pending | National Prescription Opioid Litigation | State of Alabama and Subdivisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  |  |  |  | $ 141,000,000 |  |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement, number of installment payments | installment |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |
Litigation expense |  |  |  |  | $ 33,000,000 |  |  |  |  |  |  |  |  |  |  |
Settled Litigation | National Prescription Opioid Litigation | State of Washington and Subdivisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  |  | $ 197,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of settlement to be paid by the Company (percent) |  |  | 38.10% |  |  |  |  |  |  |  |  |  |  |  |  |
Settled Litigation | National Prescription Opioid Litigation | State of Oklahoma and Subdivisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of settlement to be paid by the Company (percent) |  | 38.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settled Litigation | National Prescription Opioid Litigation | Settling Governmental Entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement payment |  |  |  |  |  |  |  |  |  |  |  | $ 375,000,000 |  |  |  |
Settled Litigation | National Prescription Opioid Litigation | Settling Governmental Entities | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement payment |  |  |  |  |  |  |  |  | $ 470,000,000 |  |  |  |  |  |  |
Settled Litigation | National Prescription Opioid Litigation | Settling Governmental Entities and State of Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement payment |  |  |  |  |  |  |  |  |  |  |  | $ 296,000,000 |  |  |  |
Escrow deposit |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 395,000,000 |  |
Settled Litigation | Distributors | National Prescription Opioid Litigation | State of Washington and Subdivisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  |  | $ 518,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Period over which award would be payable under proposed framework |  |  | 18 years |  |  |  |  |  |  |  |  |  |  |  |  |
Settled Litigation | Distributors | National Prescription Opioid Litigation | State of Oklahoma and Subdivisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award payable under proposed framework |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period over which award would be payable under proposed framework |  | 18 years |  |  |  |  |  |  |  |  |  |  |  |  |  |

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