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Goodwill Impairment Charges (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) reporting_unit | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Goodwill [Line Items] |  |  |  |  |
Pretax goodwill impairment charges | $ 0 | $ 0 |  | $ 0 | $ 570
European Pharmaceutical Solutions |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Pretax goodwill impairment charges |  |  |  |  | 570
After-tax goodwill impairment |  |  |  |  | $ 570
Number of reporting units | reporting_unit |  |  | 2 |  |
European Pharmaceutical Solutions | Pharmaceutical Distributions Reporting Unit |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Pretax goodwill impairment charges |  |  | $ 238 |  |
After-tax goodwill impairment |  |  | $ 238 |  |
Discount rate (percent) |  |  | 8.00% |  |
Terminal growth rate (percent) |  |  | 1.25% |  |
European Pharmaceutical Solutions | Retail Pharmacy Reporting Unit |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Pretax goodwill impairment charges |  |  | $ 332 |  |
After-tax goodwill impairment |  |  | $ 332 |  |
Discount rate (percent) |  |  | 8.50% |  |
Terminal growth rate (percent) |  |  | 1.25% |  |

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