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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) $ / shares in Units, shares in Millions |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 19, 2018 € / shares $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 € / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 02, 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 |  |  |  |  |  |  | $ 1,404,000,000 | $ 1,459,000,000 |  |
Noncontrolling Interests |  |  |  |  |  |  | 204,000,000 | 253,000,000 |  |
Net income attributable to noncontrolling interests |  | $ 57,000,000 | $ 58,000,000 |  | $ 169,000,000 | $ 169,000,000 |  |  |  |
Net Income (Loss) Attributable to Parent |  | 469,000,000 | 903,000,000 |  | 830,000,000 | 1,213,000,000 |  |  |  |
Net income attributable to McKesson and transfers from noncontrolling interests |  |  |  |  | 830,000,000 | 1,216,000,000 |  |  |  |
Mckesson Europe Subsidiary |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend (in usd per share) | € / shares |  |  |  | € 0.83 |  |  |  |  |  |
Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  |  |  |  | 34,000,000 | 32,000,000 |  |  |  |
Decrease in redeemable noncontrolling interests |  |  |  |  |  | 53,000,000 |  |  |  |
Carrying value of redeemable noncontrolling interests |  |  | 1,435,000,000 |  |  | 1,435,000,000 | 1,404,000,000 | 1,459,000,000 | $ 1,327,000,000 |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Effect of changes in ownership interests with noncontrolling interests |  |  |  |  |  | 3,000,000 |  |  |  |
Mckesson Europe Subsidiary |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
One-time guaranteed dividend (in usd per share) | € / shares |  |  |  |  |  |  |  |  |  | € 0.83
Net income attributable to noncontrolling interests |  | 11,000,000 | 12,000,000 |  | 34,000,000 | 32,000,000 |  |  |  |
Put right redemption price per share (in euros per share) | € / shares | € 23.50 |  |  |  |  |  |  |  |  |
Payments to acquire shares of Celesio |  |  |  |  |  | $ 50,000,000 |  |  |  |
Number of redeemable noncontrolling interest shares repurchased (shares) | shares |  |  |  |  |  | 1.9 |  |  |  |
Carrying value of redeemable noncontrolling interests |  |  |  |  |  |  | 1,400,000,000 | 1,460,000,000 |  |
Maximum redemption value of redeemable noncontrolling interest |  |  |  |  |  |  | $ 1,258,000,000.000 | $ 1,350,000,000.00 |  |
Ownership percentage (as a percent) |  |  |  |  |  |  | 77.00% | 77.00% |  |
Increase in Put Amount (in euros per share) | $ / shares | € 0.51 |  |  |  |  |  |  |  |  |
Mckesson Europe Subsidiary | Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Decrease in redeemable noncontrolling interests |  |  |  |  |  | $ 53,000,000 |  |  |  |
Vantage and ClarusOne Sourcing Services LLC |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  | $ 204,000,000 | $ 253,000,000 |  |
Net income attributable to noncontrolling interests |  | $ 46,000,000 | $ 46,000,000 |  | $ 135,000,000 | $ 137,000,000 |  |  |  |

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