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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) $ / shares in Units, shares in Millions |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 19, 2018 € / shares $ / shares | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 € / shares | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) shares | Sep. 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 |  |  |  |  |  |  | $ 1,415,000,000 | $ 1,459,000,000 |  |
Noncontrolling Interests |  |  |  |  |  |  | 208,000,000 | 253,000,000 |  |
Net income attributable to noncontrolling interests |  | $ 54,000,000 | $ 55,000,000 |  | $ 112,000,000 | $ 111,000,000 |  |  |  |
Net income attributable to McKesson and transfers from noncontrolling interests |  |  |  |  |  | 313,000,000 |  |  |  |
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 |  |  |  |  | 23,000,000 | 20,000,000 |  |  |  |
Decrease in redeemable noncontrolling interests |  |  |  |  | 0 | 53,000,000 |  |  |  |
Carrying value of redeemable noncontrolling interests |  |  | 1,423,000,000 |  |  | 1,423,000,000 | 1,415,000,000 | 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 |  | 11,000,000 | 11,000,000 |  | 23,000,000 | 20,000,000 |  |  |  |
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 |  |  |  |  |  |  | 1,420,000,000 | 1,460,000,000 |  |
Maximum redemption value of redeemable noncontrolling interest |  |  |  |  |  |  | $ 1,270,000,000.00 | $ 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 |  |  |  |  |  |  | $ 208,000,000 | $ 253,000,000 |  |
Net income attributable to noncontrolling interests |  | $ 43,000,000 | $ 44,000,000 |  | $ 89,000,000 | $ 91,000,000 |  |  |  |

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- Definition The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591554-111686 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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