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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) shares in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2018 € / shares | Dec. 02, 2014 € / shares
Noncontrolling Interest [Line Items] |  |  |  |  |
Carrying amount of redeemable noncontrolling interest | $ 1,459,000,000 | $ 1,327,000,000 |  |  |
Noncontrolling interests | 253,000,000 | 178,000,000 |  |  |
Net income attributable to noncontrolling interests | 230,000,000 | 83,000,000 | $ 52,000,000 |  |
Net income attributable to McKesson and transfers of interests | 70,000,000 |  |  |  |
Redeemable Noncontrolling Interest |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Net income attributable to noncontrolling interests | 43,000,000 | 44,000,000 |  |  |
Decrease in carrying value of redeemable noncontrolling interest | 53,000,000 |  |  |  |
Carrying amount of redeemable noncontrolling interest | 1,459,000,000 | 1,327,000,000 | 1,406,000,000 |  |
Noncontrolling Interest |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Decrease in carrying value of redeemable noncontrolling interest | 0 |  |  |  |
Noncontrolling interests | 253,000,000 | 178,000,000 | 84,000,000 |  |
Net income attributable to noncontrolling interests | 187,000,000 | 39,000,000 |  |  |
Additional Paid-in Capital |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Effect of changes in ownership interests | 3,000,000 |  |  |  |
McKesson Europe |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Annual recurring compensation (in euro per share) | € / shares |  |  |  |  | € 0.83
Net income attributable to noncontrolling interests | 43,000,000 | 44,000,000 | 44,000,000 |  |
Put right (in dollars per share) | € / shares |  |  |  | € 22.99 |
Payments to purchase shares of Mckesson Europe | $ 50,000,000 |  |  |  |
Shares purchased (shares) | shares | 1.9 |  |  |  |
Maximum redemption value | $ 1,347,000,000.000 | $ 1,210,000,000.00 |  |  |
Percentage of outstanding common shares | 77.00% | 76.00% |  |  |
McKesson Europe | Redeemable Noncontrolling Interest |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Decrease in carrying value of redeemable noncontrolling interest | $ 53,000,000 |  |  |  |
Vantage and ClarusOne Sourcing Services LLC |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Net income attributable to noncontrolling interests | $ 187,000,000 | $ 39,000,000 | $ 8,000,000 |  |

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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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