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Commitments and Contingent Liabilities - Other Litigation and Claims (Narrative) (Details) | May 17, 2013 USD ($) plaintiff | Apr. 25, 2018 city
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United States ex rel. Omni Healthcare Inc. v. McKesson Corporation, et al. |  |
Loss Contingencies [Line Items] |  |
Number of cities filed on behalf of | city |  | 33
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al., No. CV-13-02219 |  |
Loss Contingencies [Line Items] |  |
Number of plaintiffs | plaintiff | 2 |
Amounts awarded to plaintiff | $ | $ 6,500 |

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