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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 € / shares | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2014 € / shares
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Put right redemption price per share (in euros per share) | € / shares |  |  |  |  | € 22.99 |  |  |
Put right value, interest rate spread (as a percent) |  |  |  |  |  | 5.00% |  |
Carrying value of redeemable noncontrolling interests |  |  |  |  |  | $ 1,384,000,000 | $ 1,393,000,000 |
Noncontrolling Interests |  |  |  |  |  | 210,000,000 | 193,000,000 |
Net income attributable to noncontrolling interests | $ 53,000,000 | $ 54,000,000 | $ 107,000,000 | $ 112,000,000 |  |  |  |
Mckesson Europe Subsidiary |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Annual recurring dividend (in euro per share) | € / shares |  |  |  |  | € 0.83 |  |  |
Mckesson Europe Subsidiary |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
One-time guaranteed dividend (usd per share) | € / shares |  |  |  |  |  |  |  | € 0.83
Net income attributable to noncontrolling interests | 11,000,000 | 11,000,000 | 22,000,000 | 23,000,000 |  |  |  |
Carrying value of redeemable noncontrolling interests |  |  |  |  |  | 1,380,000,000 | 1,390,000,000 |
Maximum redemption value of redeemable noncontrolling interest |  |  |  |  |  | $ 1,200,000,000 | $ 1,230,000,000 |
Ownership percentage (as a percent) |  |  |  |  |  | 77.00% | 77.00% |
Vantage and ClarusOne Sourcing Services LLC |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  | $ 210,000,000 | $ 193,000,000 |
Net income attributable to noncontrolling interests | $ 42,000,000 | $ 43,000,000 | $ 85,000,000 | $ 89,000,000 |  |  |  |

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