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Goodwill Impairment Charges (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018
Goodwill [Line Items] |  |  |  |  |  |
Goodwill and asset impairment charges | $ 0 | $ 570,000,000 | $ 350,000,000 | $ 570,000,000 | $ 350,000,000 |
Goodwill | 10,627,000,000 |  |  | 10,627,000,000 |  | $ 10,924,000,000
Goodwill impairment, tax benefit |  |  |  | 0 | $ 0 |
European Pharmaceutical Solutions |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill and asset impairment charges |  | 570,000,000 |  | 570,000,000 |  |
Goodwill | 1,210,000,000 |  |  | 1,210,000,000 |  | $ 1,850,000,000
Mckesson Europe Reporting Unit |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill and asset impairment charges |  |  | 350,000,000 |  |  |
Goodwill impairment, tax benefit |  |  | $ 0 |  |  |
Consumer Solutions Reporting Unit |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill and asset impairment charges |  | $ 332,000,000 |  |  |  |
Discount rate (percent) |  | 8.50% |  |  |  |
Terminal growth rate (percent) |  | 1.25% |  |  |  |
Goodwill | 466,000,000 |  |  | 466,000,000 |  |
Pharmacy Solutions Reporting Unit |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill and asset impairment charges |  | $ 238,000,000 |  |  |  |
Discount rate (percent) |  | 8.00% |  |  |  |
Terminal growth rate (percent) |  | 1.25% |  |  |  |
Goodwill | $ 744,000,000 |  |  | $ 744,000,000 |  |

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