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v3.21.1

Related Party Balances and Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
McKesson Foundation |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Contributions made | $ 20 |  |  |
Investee |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue from related parties |  | $ 178 | $ 141 | $ 137
Investee | U.S. Pharmaceutical and Specialty Solutions [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue from related parties |  | $ 111 | $ 60 | 34
Other accrued liabilities | California Foundation |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Pledge payable balance |  |  |  | $ 100

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