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Goodwill Impairment Charges (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) reporting_unit | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) reporting_unit | Dec. 31, 2017 USD ($) | Mar. 31, 2018 USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |
Pretax goodwill impairment charges | $ 21,000,000 |  | $ 0 |  | $ 591,000,000 | $ 350,000,000 |
Goodwill | 10,519,000,000 |  |  |  | 10,519,000,000 |  | $ 10,924,000,000
Consumer Solutions Reporting Unit |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
After-tax goodwill impairment |  | $ 332,000,000 |  |  |  |  |
Pharmacy Solutions Reporting Unit |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
After-tax goodwill impairment |  | 238,000,000 |  |  |  |  |
European Pharmaceutical Solutions |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Pretax goodwill impairment charges |  | 570,000,000 |  |  | $ 570,000,000 |  |
After-tax goodwill impairment |  | $ 570,000,000 |  |  |  |  |
Number of reporting units | reporting_unit |  | 2 |  |  | 2 |  |
Goodwill | 1,193,000,000 |  |  |  | $ 1,193,000,000 |  | 1,850,000,000
European Pharmaceutical Solutions | Consumer Solutions Reporting Unit |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Pretax goodwill impairment charges |  | $ 332,000,000 |  |  |  |  |
Discount rate (percent) |  | 8.50% |  |  |  |  |
Terminal growth rate (percent) |  | 1.25% |  |  |  |  |
Goodwill | 461,000,000 |  |  |  | 461,000,000 |  |
European Pharmaceutical Solutions | Pharmacy Solutions Reporting Unit |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Pretax goodwill impairment charges |  | $ 238,000,000 |  |  |  |  |
Discount rate (percent) |  | 8.00% |  |  |  |  |
Terminal growth rate (percent) |  | 1.25% |  |  |  |  |
Goodwill | 732,000,000 |  |  |  | 732,000,000 |  |
Distribution Solutions Segment |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Pretax goodwill impairment charges |  |  |  | $ 350,000,000 |  |  |
After-tax goodwill impairment |  |  |  | 350,000,000 |  |  |
Other |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Pretax goodwill impairment charges |  |  |  |  | 21,000,000 |  |
Goodwill | 2,806,000,000 |  |  |  | $ 2,806,000,000 |  | $ 2,894,000,000
Other | Rexall Health |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Pretax goodwill impairment charges | 21,000,000 |  |  |  |  |  |
After-tax goodwill impairment | $ 21,000,000 |  |  |  |  |  |
Mckesson Europe Reporting Unit |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment, tax benefit |  |  |  | $ 0 |  |  |

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