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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) shares in Millions | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) shares | Apr. 12, 2021 € / shares | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Sep. 19, 2018 € / shares | Dec. 31, 2014 € / shares
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Put right redemption price per share (in euros per share) | € / shares |  |  | € 22.99 |  |  | € 23.50 | € 22.99
Put right value, interest rate spread (as a percent) | 5.00% |  |  |  |  |  |
Increase in Put Amount (in Euros per share) | € / shares |  |  |  |  |  | € 0.51 |
Payments for purchase shares of McKesson Europe | $ 1,031,000,000 | $ 49,000,000 |  |  |  |  |
Associated increase in Company's ownership interest on its equity | 8,000,000 | 3,000,000 |  |  |  |  |
Carrying value of redeemable noncontrolling interests | 7,000,000 |  |  | $ 1,271,000,000 |  |  |
Net income attributable to noncontrolling interests | 47,000,000 | 50,000,000 |  |  |  |  |
Redeemable Noncontrolling Interests |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net income attributable to noncontrolling interests | 8,000,000 | 11,000,000 |  |  |  |  |
Decrease in noncontrolling interest | 983,000,000 | 49,000,000 |  |  |  |  |
Carrying value of redeemable noncontrolling interests | 7,000,000 | 1,414,000,000 |  | 1,271,000,000 | $ 1,402,000,000 |  |
Additional Paid-in Capital |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Associated increase in Company's ownership interest on its equity | 178,000,000 | 3,000,000 |  |  |  |  |
McKesson Europe Subsidiary |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Annual recurring dividend (in euro per share) | € / shares |  |  | € 0.83 |  |  |  | € 0.83
McKesson Europe Subsidiary |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net income attributable to noncontrolling interests | 8,000,000 | 11,000,000 |  |  |  |  |
Payments for purchase shares of McKesson Europe | $ 1,000,000,000.0 | $ 49,000,000 |  |  |  |  |
Shares purchased (shares) | shares | 34.5 | 1.8 |  |  |  |  |
Carrying value of redeemable noncontrolling interests |  |  |  | 1,300,000,000 |  |  |
Maximum redemption value of redeemable noncontrolling interest |  |  |  | $ 1,200,000,000 |  |  |
Ownership percentage (as a percent) | 95.00% |  |  | 78.00% |  |  |
Vantage and ClarusOne Sourcing Services LLC |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net income attributable to noncontrolling interests | $ 39,000,000 | $ 39,000,000 |  |  |  |  |

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