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Commitments and Contingent Liabilities (Details) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 28 Months Ended |  |  |  |  |  |  |
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Apr. 22, 2020 USD ($) | Jan. 09, 2020 USD ($) | Oct. 21, 2019 USD ($) state_attorney company | Feb. 25, 2019 | Apr. 03, 2018 state city | Dec. 30, 2017 investment_fund | Dec. 29, 2017 investment_fund | May 17, 2013 USD ($) | Apr. 16, 2013 defendant state relator | Dec. 31, 2019 complaint relator | Sep. 30, 2017 state_attorney | Jul. 31, 2015 USD ($) | Mar. 31, 2020 USD ($) site county case | Mar. 31, 2020 USD ($) site state_attorney state county case | Jan. 14, 2020 company | Jan. 13, 2020 case | Nov. 30, 2019 complaint | Oct. 31, 2019 complaint | Aug. 13, 2019 fax fax_number | Dec. 12, 2018 officer | Aug. 31, 2018 software_product case
Investigation into Factors Contributing to Increase in Opioid-related Hospitalizations and Deaths |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | case |  |  |  |  |  |  |  |  |  |  |  |  | 385 | 385 |  |  |  |  |  |  |
Number of states filed on behalf of |  |  |  |  |  |  |  |  |  |  | 40 |  |  | 36 |  |  |  |  |  |  |
Number of plaintiffs | state_attorney |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |  |  |  |
Number of county governments that brought case | county |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |
Environmental Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites | site |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 5 |  |  |  |  |  |  |
Remediation costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |  |
Hazardous substance sites, number | site |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |
Number of sites selected for preferred remediation | site |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |
Estimated environmental assessment and cleanup costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,380,000,000 |  |  |  |  |  |  |  |
Estimated loss |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,500,000 | $ 22,500,000 |  |  |  |  |  |  |
Environmental Litigation | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time frame of disbursements |  |  |  |  |  |  |  |  |  |  |  |  | 2020-04 |  |  |  |  |  |  |  |
Environmental Litigation | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time frame of disbursements |  |  |  |  |  |  |  |  |  |  |  |  | 2050-03 |  |  |  |  |  |  |  |
In re: National Prescription Opiate Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints served | case |  |  |  |  |  |  |  |  |  |  |  |  | 2,800 | 2,800 |  |  |  |  |  |  |
In re: National Prescription Opiate Litigation | Pending Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases selected for remand to other federal courts | case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Number of state attorneys | state_attorney |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount expected to be paid |  |  | $ 6,900,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected payment period |  |  | 18 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Aggregate amount expected to be paid |  |  | $ 18,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected payment period |  |  | 18 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For Two Counties In re: National Prescription Opiate Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  | $ 82,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In re McKesson Corporation Stockholder Derivative Litigation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to be received from insurance carriers | $ 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Attorney fees awarded to the plaintiffs' counsel | $ 44,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum effective period of governance enhancements | 4 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 | complaint |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Number of relators alleging violations | relator |  |  |  |  |  |  |  |  |  | 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 | investment_fund |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Davidson Kempner International (BVI) Ltd., et al. v. McKesson Europe Holdings GmbH & Co. KGaA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | investment_fund |  |  |  |  |  | 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 |
The Great Atlantic & Pacific Tea Company, Inc., et al |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount sought to be recovered |  |  |  |  |  |  |  |  |  |  |  | $ 68,000,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |
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 | software_product |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2

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