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Related Party Balances and Transactions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
McKesson Foundation |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Contributions made |  | $ 20 |  |  |
Investee |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from related parties |  |  | $ 141 | $ 137 | $ 154
Investee | U.S. Pharmaceutical and Specialty Solutions |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from related parties |  |  | $ 60 | $ 34 |
Other accrued liabilities | California Foundation |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Pledge payable balance | $ 100 |  |  |  | $ 100
Selling, Distribution and Administrative Expenses | California Foundation |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Pre-tax charitable contribution expense | 100 |  |  |  |
After-tax charitable contribution expense | $ 64 |  |  |  |

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