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Commitments and Contingent Liabilities (Details) |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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May 03, 2022 USD ($) | Apr. 27, 2022 USD ($) | Apr. 02, 2022 USD ($) installment | Sep. 28, 2021 USD ($) | Feb. 25, 2019 | Apr. 03, 2018 city state | May 17, 2013 USD ($) | Apr. 16, 2013 defendant state relator | Jul. 31, 2020 state | Dec. 31, 2019 complaint relator | Mar. 31, 2022 USD ($) case site product | Dec. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Feb. 25, 2022 product | Sep. 30, 2021 USD ($) | Oct. 23, 2020 case | Nov. 30, 2019 complaint | Oct. 31, 2019 complaint | Aug. 13, 2019 faxNumber fax | Dec. 12, 2018 officer | Aug. 31, 2018 softwareProduct case
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual surcharge |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |
U.S. Pharmaceutical | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from settlements |  |  |  |  |  |  |  |  |  |  | $ (46,000,000) |  | $ (181,000,000) | $ (22,000,000) |  |  |  |  |  |  |  |
New York Opioid Tax Surcharge | U.S. Pharmaceutical |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge recorded related to Company's share of the litigation settlement |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |
After-tax charge recorded related to Company's share of the litigation settlement |  |  |  |  |  |  |  |  |  |  |  |  | 37,000,000 |  |  |  |  |  |  |  |  |
Loss contingency accrual, payments |  |  |  |  |  |  |  |  |  |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |  |
Environmental Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites | site |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |
Remediation costs |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Hazardous substance sites, number | site |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |
Number of sites selected for preferred remediation | site |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Estimated environmental assessment and cleanup costs |  |  |  |  |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  |  |  |  |  |  |  |
Estimated loss |  |  |  |  |  |  |  |  |  |  | 29,000,000 |  |  |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, accrual, current |  |  |  |  |  |  |  |  |  |  | 1,046,000,000 |  | 0 |  |  |  |  |  |  |  |  |
Loss contingency, accrual, noncurrent |  |  |  |  |  |  |  |  |  |  | 7,220,000,000 |  | 8,067,000,000 |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  |  |  | $ 8,266,000,000 |  | $ 8,067,000,000 |  |  |  |  |  |  |  |  |
Canada | National Prescription Opiate Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | case |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |
Canada | National Prescription Opiate Litigation | Governmental Entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | case |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Canada | National Prescription Opiate Litigation | Individual Claimant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | case |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
United States ex rel. Manchester v. Purdue Pharma, L.P., et al |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period within which party can be substituted |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States of America, ex rel. Carl Kelley and Michael McElligott, 19-cv-2233, and State of California, ex rel. Carl Kelley and Michael McElligott, CGC-19-576931 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | complaint |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Number of relators alleging violations | relator |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Insurance Coverage Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of faxes remaining in class | faxNumber |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,490 |  |
Number of faxes received | fax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,769 |  |
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, statutory damages |  | $ 6,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought per violation |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought per violation |  |  |  |  |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States ex rel. Omni Healthcare Inc. v. McKesson Corporation, et al. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cities filed on behalf of | city |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states filed on behalf of | state |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Evanston Police Pension Fund v. McKesson Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of former officers | officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Powell Prescription Center, et al. v. Surescripts, LLC, et al., and Intergrated Pharmaceutical Solutions LLC v. Surescripts, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Kennebunk Village Pharmacy, Inc. v. SureScripts, LLC, et al., 1:19-cv-7445; Whitman v. SureScripts, LLC et al., No. 1:19-cv-7448; BBK Global Corp. v. SureScripts, LLC et al., 1:19-cv-7640 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Actions v SureScripts, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | complaint |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Civil Investigative Demands by the U.S. Attorney’s Office for the Eastern District of New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Number of software products | softwareProduct |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
National Prescription Opiate Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states | product |  |  |  |  |  |  |  |  |  |  | 46 |  |  |  |  |  |  |  |  |  |  |
Number of eligible states | product |  |  |  |  |  |  |  |  |  |  | 49 |  |  |  |  |  |  |  |  |  |  |
Number of eligible political subdivisions, participation percentage (in percent) |  |  |  |  |  |  |  |  |  |  | 98.00% |  |  |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation | Cherokee Nation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount expected to be paid |  |  |  | $ 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party, percentage of total settlement award |  |  |  | 38.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement, installment payments, term (in years) |  |  |  | 6 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation | Native American Tribes Other Than Cherokee Nation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount expected to be paid |  |  |  | $ 167,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party, percentage of total settlement award |  |  |  | 38.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement, installment payments, term (in years) |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total settlement to be used to remediate damages (in percent) |  |  |  | 0.85 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation | Three National Pharmaceutical Distributors | Cherokee Nation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount expected to be paid |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation | Three National Pharmaceutical Distributors | Native American Tribes Other Than Cherokee Nation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount expected to be paid |  |  |  | $ 440,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation | Pending Litigation | Alabama | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount expected to be paid |  |  | $ 141,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement payments |  |  | $ 33,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement, payment terms | installment |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation | Settled Litigation | Settling Governmental Entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  |  |  |  |  |  |  |  |  |  | $ 157,000,000 |  |  |  |  |  |  |  |  |  |  |
Escrow deposit |  |  |  |  |  |  |  |  |  |  | $ 41,000,000 |  |  |  |  | $ 354,000,000 |  |  |  |  |  |
National Prescription Opiate Litigation | Settled Litigation | Settling Governmental Entities | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount expected to be paid |  |  | $ 7,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party, percentage of total settlement award |  |  | 38.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation | Settled Litigation | State of Washington and Subdivisions | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount expected to be paid | $ 197,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party, percentage of total settlement award | 38.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation | Settled Litigation | Distributors | Settling Governmental Entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other defendants | product |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
National Prescription Opiate Litigation | Settled Litigation | Distributors | Settling Governmental Entities | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount expected to be paid |  |  | $ 19,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected payment period |  |  | 18 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, award amount to be used by state and local government |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation | Settled Litigation | Distributors | State of Washington and Subdivisions | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount expected to be paid | $ 518,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States ex rel. Piacentile v. Amgen Inc., et al. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of relators | relator |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional defendants | defendant |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states filed on behalf of | state |  |  |  |  |  |  |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Estimated Environmental Assessment And Cleanup Costs + References No definition available. + Details
Name: | mck_EstimatedEnvironmentalAssessmentAndCleanupCosts
Namespace Prefix: | mck_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of sites that hazardous substances were allegedly disposed at. + References No definition available. + Details
Name: | mck_HazardousSubstanceSites
Namespace Prefix: | mck_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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