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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) shares	Jun. 30, 2016 USD ($)	Dec. 31, 2014 € / shares	Jun. 30, 2017 € / shares	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
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%
Payments to acquire shares of Celesio	$ 50
Number of redeemable noncontrolling interest shares repurchased (shares) | shares	1.9
Carrying value of redeemable noncontrolling interests					$ 1,390	$ 1,327
Maximum redemption value of redeemable noncontrolling interest					$ 1,240	$ 1,210
Ownership percentage (as a percent)					77.00%	76.00%
Noncontrolling Interests					$ 210	$ 178
Net income attributable to noncontrolling interests	$ 56	$ 18
Net income attributable to McKesson and transfers from noncontrolling interests	312
Celesio
Noncontrolling Interest [Line Items]
Common Stock, Dividends, Per Share, Cash Paid | € / shares			€ 0.83
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	9	11
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Decrease in redeemable noncontrolling interests	0
Noncontrolling Interests		242			210	178	$ 84
Net income attributable to noncontrolling interests	47	7
Redeemable Noncontrolling Interest
Noncontrolling Interest [Line Items]
Decrease in redeemable noncontrolling interests	53
Carrying value of redeemable noncontrolling interests		1,340			$ 1,390	$ 1,327	$ 1,406
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	9	$ 11
Additional Paid-in Capital
Noncontrolling Interest [Line Items]
Effect of changes in ownership interests with noncontrollling interests	$ 3

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Aggregate dividends paid during the period for each share of common stock outstanding.

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This element represents the total net income attributable to the parent for the period and the effect of net changes 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 result in a deconsolidation of the subsidiary from the consolidated financial statements.

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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.

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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).

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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