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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 € / shares	Sep. 30, 2017 USD ($) shares	Sep. 30, 2016 USD ($)	Sep. 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						$ 1,423	$ 1,327
Maximum redemption value of redeemable noncontrolling interest						$ 1,290	$ 1,210
Ownership percentage (as a percent)						77.00%	76.00%
Noncontrolling Interests						$ 219	$ 178
Net income attributable to noncontrolling interests	$ 55	$ 17		$ 111	$ 35
Net income attributable to McKesson and transfers from noncontrolling interests				313
Mckesson Europe
Noncontrolling Interest [Line Items]
Annual recurring compensation (in Euros per share) | € / shares			€ 0.83
Net income attributable to noncontrolling interests	11	12			23
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Decrease in redeemable noncontrolling interests				0
Noncontrolling Interests		174			174	219	178	$ 84
Net income attributable to noncontrolling interests	$ 44	5		91	12
Redeemable Noncontrolling Interest
Noncontrolling Interest [Line Items]
Decrease in redeemable noncontrolling interests				53
Carrying value of redeemable noncontrolling interests		$ 1,341			1,341	$ 1,423	$ 1,327	$ 1,406
Net income attributable to noncontrolling interests				20	$ 23
Redeemable Noncontrolling Interest | Mckesson Europe
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests				20
Additional Paid-in Capital
Noncontrolling Interest [Line Items]
Effect of changes in ownership interests with noncontrolling 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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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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The cash outflow during the period for redemption of redeemable noncontrolling interests.

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As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form.

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