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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) shares in Millions, $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 19, 2018 € / shares | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Apr. 12, 2021 € / shares | Mar. 31, 2021 € / shares | Mar. 31, 2018 USD ($)
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Annual increase in interest (percent) |  | 5.00% |  |  |  |  |
Exercise of put right by noncontrolling shareholders of McKesson Europe |  | $ 3 |  |  |  |  |
Carrying amount of redeemable noncontrolling interest |  | 1,271 | $ 1,402 |  |  |  |
Noncontrolling interests |  | 196 | 217 |  |  |  |
Net income attributable to noncontrolling interests |  | 199 | 220 | $ 221 |  |  |
Redeemable Noncontrolling Interests |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  | 43 | 42 | 45 |  |  |
Exercise of put right by noncontrolling shareholders of McKesson Europe |  | (49) |  |  |  |  |
Carrying amount of redeemable noncontrolling interest |  | 1,271 | 1,402 | 1,393 |  |  | $ 1,459
Additional Paid-in Capital |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Exercise of put right by noncontrolling shareholders of McKesson Europe |  | 3 |  |  |  |  |
McKesson Europe |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  | 43 | 42 | 45 |  |  |
Put right (in euro per share) | € / shares | € 23.50 |  |  |  |  | € 22.99 |
Payments to purchase shares of McKesson Europe |  | $ 49 |  |  |  |  |
Shares purchased (shares) | shares |  | 1.8 |  |  |  |  |
Maximum redemption value |  | $ 1,200 | $ 1,200 |  |  |  |
Percentage of outstanding common shares |  | 78.00% | 77.00% |  |  |  |
Put Right increase (euros per share) | € / shares | € 0.51 |  |  |  |  |  |
Vantage and ClarusOne Sourcing Services LLC |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  | $ 156 | $ 178 | $ 176 |  |  |
McKesson Europe |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Annual recurring compensation (in euro per share) | € / shares |  |  |  |  |  | € 0.83 |
Subsequent Event | McKesson Europe |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Put right (in euro per share) | € / shares |  |  |  |  | € 22.99 |  |
Subsequent Event | McKesson Europe |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Annual recurring compensation (in euro per share) | € / shares |  |  |  |  | € 0.83 |  |

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