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Commitments and Contingent Liabilities (Details) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 17 Months Ended | 40 Months Ended |  |  |  |  |  |  |
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Feb. 25, 2019 | Apr. 03, 2018 state city | Dec. 30, 2017 investmentFund | Dec. 29, 2017 investmentFund | May 17, 2013 USD ($) | Apr. 16, 2013 relator defendant state | Jul. 31, 2020 state | Dec. 31, 2019 complaint relator | Mar. 31, 2021 USD ($) site case company county | Mar. 31, 2021 USD ($) site case company county | Mar. 31, 2021 USD ($) site case company state stateAttorney county | Oct. 23, 2020 case | Jan. 13, 2020 case | Nov. 30, 2019 complaint | Oct. 31, 2019 complaint | Aug. 13, 2019 fax_number fax | Dec. 12, 2018 officer | Aug. 31, 2018 case softwareProduct
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual surcharge |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 |  |  |  |  |  |  |
Investigation into Factors Contributing to Increase in Opioid-related Hospitalizations and Deaths |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | case |  |  |  |  |  |  |  |  | 300 | 300 | 300 |  |  |  |  |  |  |
Number of states filed on behalf of | state |  |  |  |  |  |  |  |  |  |  | 38 |  |  |  |  |  |  |
Number of plaintiffs | stateAttorney |  |  |  |  |  |  |  |  |  |  | 26 |  |  |  |  |  |  |
Number of county governments that brought case | county |  |  |  |  |  |  |  |  | 2 | 2 | 2 |  |  |  |  |  |  |
New York Opioid Tax Surcharge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After-tax charge recorded related to Company's share of the litigation settlement |  |  |  |  |  |  |  |  | $ 37,000,000 |  |  |  |  |  |  |  |  |
Environmental Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites | site |  |  |  |  |  |  |  |  | 5 | 5 | 5 |  |  |  |  |  |  |
Remediation costs |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |  |
Hazardous substance sites, number | site |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |
Number of sites selected for preferred remediation | site |  |  |  |  |  |  |  |  | 1 | 1 | 1 |  |  |  |  |  |  |
Estimated environmental assessment and cleanup costs |  |  |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  |  |  |  |  |
Estimated loss |  |  |  |  |  |  |  |  | $ 28,000,000 | $ 28,000,000 | $ 28,000,000 |  |  |  |  |  |  |
Environmental Litigation | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time frame of disbursements |  |  |  |  |  |  |  |  | April 2021 |  |  |  |  |  |  |  |  |
Environmental Litigation | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time frame of disbursements |  |  |  |  |  |  |  |  | March 2051 |  |  |  |  |  |  |  |  |
National Prescription Opiate Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge recorded related to Company's share of the litigation settlement |  |  |  |  |  |  |  |  | $ 8,100,000,000 |  |  |  |  |  |  |  |  |
After-tax charge recorded related to Company's share of the litigation settlement |  |  |  |  |  |  |  |  | $ 6,800,000,000 |  |  |  |  |  |  |  |  |
Canada | Investigation into Factors Contributing to Increase in Opioid-related Hospitalizations and Deaths |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | case |  |  |  |  |  |  |  |  | 3 | 3 | 3 |  |  |  |  |  |  |
In re: National Prescription Opiate Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | case |  |  |  |  |  |  |  |  | 2,900 | 2,900 | 2,900 |  |  |  |  |  |  |
In re: National Prescription Opiate Litigation | Pending Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases selected for remand to other federal courts | case |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Aggregate amount expected to be paid |  |  |  |  |  |  |  |  |  | $ 8,000,000,000.0 |  |  |  |  |  |  |  |
Portion expected to be applied towards the opioid crisis remediation (percent) |  |  |  |  |  |  |  |  | 90.00% | 90.00% | 90.00% |  |  |  |  |  |  |
In re: National Prescription Opiate Litigation | Pending Litigation | Three Largest U.S. Pharmaceutical Distributors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of largest distributors | company |  |  |  |  |  |  |  |  | 3 | 3 | 3 |  |  |  |  |  |  |
Aggregate amount expected to be paid |  |  |  |  |  |  |  |  |  | $ 21,000,000,000.0 |  |  |  |  |  |  |  |
Expected payment period |  |  |  |  |  |  |  |  |  | 18 years |  |  |  |  |  |  |  |
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 | fax_number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,490 |  |
Number of faxes received | fax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,769 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Polygon European Equity Opportunity Master Fund et al. v. McKesson Europe Holdings GmbH & Co. KGaA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | investmentFund |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Davidson Kempner International (BVI) Ltd., et al. v. McKesson Europe Holdings GmbH & Co. KGaA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | investmentFund |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States ex rel. Piacentile v. Amgen Inc., et al. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states filed on behalf of | state |  |  |  |  |  | 21 |  |  |  |  |  |  |  |  |  |  |  |
Number of relators alleging violations | relator |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Number of other defendants in case | defendant |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
United States ex rel. Omni Healthcare Inc. v. McKesson Corporation, et al. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states filed on behalf of | state |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cities filed on behalf of | city |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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

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