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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, 2023 USD ($) | Mar. 31, 2022 USD ($) shares | Mar. 31, 2021 USD ($) shares | Apr. 12, 2021 € / shares | Mar. 31, 2020 USD ($) | Dec. 31, 2014 € / shares
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Put right (in euro per share) | € / shares | € 23.50 |  |  |  | € 22.99 |  |
Annual increase in interest (percent) |  |  |  |  |  |  | 5.00%
Put Right increase (euros per share) | € / shares | € 0.51 |  |  |  |  |  |
Payments to purchase shares of McKesson Europe |  | $ 0 | $ 1,031 | $ 49 |  |  |
Exercise of put right by noncontrolling shareholders of McKesson Europe AG |  |  | 8 | 3 |  |  |
Reclassification of McKesson Europe AG redeemable noncontrolling interests |  |  | (287) |  |  |  |
Noncontrolling interests |  | 367 | 480 |  |  |  |
Net income attributable to noncontrolling interests |  | 162 | 173 | 199 |  |  |
Redeemable Noncontrolling Interests |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net income (loss) attributable to redeemable noncontrolling interest |  | 0 | 8 | 43 |  |  |
Exercise of put right |  |  | 983 | 49 |  |  |
Reclassification of McKesson Europe AG redeemable noncontrolling interests |  |  | 287 |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Exercise of put right by noncontrolling shareholders of McKesson Europe AG |  |  | 178 | 3 |  |  |
Noncontrolling Interests |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Exercise of put right |  |  | 0 | 0 |  |  |
Reclassification of McKesson Europe AG redeemable noncontrolling interests |  |  | (287) |  |  |  |
Noncontrolling interests |  | 367 | 480 | 196 |  | $ 217 |
Net income attributable to noncontrolling interests |  | 162 | 165 | 156 |  |  |
McKesson Europe |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net income (loss) attributable to redeemable noncontrolling interest |  |  | 8 | 43 |  |  |
Put right (in euro per share) | € / shares |  |  |  |  |  |  | € 22.99
Payments to purchase shares of McKesson Europe |  |  | $ 1,000 | $ 49 |  |  |
Shares purchased (shares) | shares |  |  | 34.5 | 1.8 |  |  |
Percentage of outstanding common shares |  |  | 95.00% |  |  |  |
Vantage and ClarusOne Sourcing Services LLC |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  | $ 162 | $ 165 | $ 156 |  |  |
McKesson Europe |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Annual recurring compensation (in euro per share) | € / shares |  |  |  |  | € 0.83 |  | € 0.83

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