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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) shares in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 € / shares | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) shares | Jun. 30, 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 |  |  |  | $ 1,422,000,000 | $ 1,459,000,000 |  |
Noncontrolling Interests |  |  |  | 240,000,000 | 253,000,000 |  |
Net income attributable to noncontrolling interests |  | $ 58,000,000 | $ 56,000,000 |  |  |  |
Net income attributable to McKesson and transfers from noncontrolling interests |  |  | 312,000,000 |  |  |  |
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 |  | 12,000,000 | 9,000,000 |  |  |  |
Decrease in redeemable noncontrolling interests |  | 0 | 53,000,000 |  |  |  |
Carrying value of redeemable noncontrolling interests |  |  | 1,390,000,000 | 1,422,000,000 | 1,459,000,000 | $ 1,327,000,000 |
Additional Paid-in Capital |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Effect of changes in ownership interests with noncontrollling 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 |  | 12,000,000 | 9,000,000 |  |  |  |
Payments to acquire shares of Celesio |  |  | $ 50,000,000 |  |  |  |
Number of redeemable noncontrolling interest shares repurchased (shares) | shares |  |  | 1.9 |  |  |  |
Maximum redemption value of redeemable noncontrolling interest |  |  |  | $ 1,280,000,000.00 | $ 1,350,000,000.00 |  |
Ownership percentage (as a percent) |  |  |  | 77.00% | 77.00% |  |
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 |  |  |  | $ 240,000,000 | $ 253,000,000 |  |
Net income attributable to noncontrolling interests |  | $ 46,000,000 | $ 47,000,000 |  |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(24)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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