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Commitments and Contingent Liabilities - Narrative (Details) | Jan. 08, 2019 municipality | Dec. 28, 2018 county | Apr. 03, 2018 state | Apr. 03, 2018 city | Dec. 30, 2017 investment_fund | Dec. 29, 2017 investment_fund | Jan. 29, 2019 case | Dec. 31, 2018 complaint case | Oct. 05, 2018 case | Sep. 17, 2018 case
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Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity | complaint |  |  |  |  |  |  |  | 1,400 |  |
The County of Summit, Ohio v. Purdue Pharma L.P., et al. |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity |  |  |  |  |  |  |  |  | 3 |
Cabell County Commission, West Virginia v. AmerisourceBergen Drug Corp., et al. |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity |  |  |  |  |  |  |  | 2 |  |
Boone County Commission, et al., v. Purdue Pharma L.P., et al |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | county |  | 8 |  |  |  |  |  |  |  |
In re McKesson Corporation Derivative Litigation |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity |  |  |  |  |  |  |  |  |  | 2
United States ex rel. Omni Healthcare Inc. v. McKesson Corporation, et al. |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  | 30 | 2 |  |  |  |  |  |
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 |  |  |  |  |
Subsequent event | The County of Summit, Ohio v. Purdue Pharma L.P., et al. |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Complaints filed against the entity |  |  |  |  |  |  | 3 |  |  |
Subsequent event | Boone County Commission, et al., v. Purdue Pharma L.P., et al |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases dismissed | municipality | 21 |  |  |  |  |  |  |  |  |

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