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No definition available.

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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- Definition

The change in the inventory reserve representing the cumulative difference in cost between the first in, first out and the last in, first out inventory valuation methods, which change has been reflected in the statement of income during the period.

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- Definition

The number of countries in which the entity operates as of balance sheet date.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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No definition available.

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- Definition

Cash received for the settlement of litigation during the current period.

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- Definition

Cash inflow representing an adjustment to the purchase price of a previous acquisition.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Segments of Business - Narrative (Details) $ in Millions, $ in Millions			3 Months Ended								6 Months Ended		12 Months Ended
	May 23, 2018 USD ($)	May 23, 2018 CAD ($)	Mar. 31, 2019 USD ($) country	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($) segment	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2017 CAD ($)	Mar. 31, 2019 USD ($) country	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment						3
Credits associated with last-in, first-out inventory method			$ 146	$ 21	$ 22	$ 21	$ 94	$ 2	$ 29	$ (26)			$ 210	$ 99	$ 7
Net cash proceeds from settlements			63	104		35
Gain from sale of equity method investment, pre-tax															0
Goodwill impairment charge													1,797	1,738	290
Long-lived asset impairment charges, before tax			$ 190			20
Loss from equity method investment in Change Healthcare							(23)	90	61	$ 120
Pre-tax gain on sale of business													0	109	0
Employee Severance and Other Exit Related Costs
Segment Reporting Information [Line Items]
Pre-tax charge													94
Employee Severance \| Strategic Growth Initiative Plan - Relocation of Corporate Headquarters
Segment Reporting Information [Line Items]
Pre-tax charge													33
Intangible Asset and Store Assets Impairment \| Fiscal 2018 McKesson Europe Plan
Segment Reporting Information [Line Items]
Long-lived asset impairment charges, before tax							257		189
Severance and Lease Exit Costs \| Fiscal 2018 McKesson Europe Plan
Segment Reporting Information [Line Items]
Pre-tax charge													18	74
Disposal Group, Held-for-sale, Not Discontinued Operations \| Enterprise Information Solutions
Segment Reporting Information [Line Items]
Pre-tax gain on sale of business								$ 109						109
U.S. Pharmaceutical and Specialty Solutions
Segment Reporting Information [Line Items]
Gain from sale of equity method investment, pre-tax														43
Goodwill impairment charge													0	0
U.S. Pharmaceutical and Specialty Solutions \| Operating Segments
Segment Reporting Information [Line Items]
Net cash proceeds from settlements													$ 202		144
European Pharmaceutical Solutions
Segment Reporting Information [Line Items]
Number of countries in which entity operates \| country			13										13
Goodwill impairment charge			$ 1,206			570							$ 1,776	1,283
Long-lived asset impairment charges, before tax													210	446
Loss from equity method investment in Change Healthcare													(43)	(32)	(30)
Other
Segment Reporting Information [Line Items]
Gain from sale of equity method investment, pre-tax				56									56
Goodwill impairment charge													21	455	290
Pre-tax charge													91
Other \| Operating Segments
Segment Reporting Information [Line Items]
Goodwill impairment charge															290
Pre-tax credit representing reduction in TRA liability														46
Medical-Surgical Solutions
Segment Reporting Information [Line Items]
Goodwill impairment charge													0	0
Distribution Solutions
Segment Reporting Information [Line Items]
Gain from sale of equity method investment, pre-tax									$ 43
Technology Solutions
Segment Reporting Information [Line Items]
Goodwill impairment charge															290
Rexall Health
Segment Reporting Information [Line Items]
Goodwill impairment charge							$ 455
Long-lived asset impairment charges, before tax				35									35	488
Rexall Health \| Other
Segment Reporting Information [Line Items]
Goodwill impairment charge														455
Corporate Joint Venture \| Core MTS Businesses
Segment Reporting Information [Line Items]
Ownership interest in Joint Venture (percent)								70.00%
Change Healthcare
Segment Reporting Information [Line Items]
Loss from equity method investment in Change Healthcare			$ 32	$ 50	56	$ 56							194	248	0
Change Healthcare \| Other \| Operating Segments \| Core MTS Businesses
Segment Reporting Information [Line Items]
Gain from sale of equity method investment, pre-tax															3,947
Pre-tax gain on sale of business															$ 3,900
Change Healthcare \| Technology Solutions \| Operating Segments \| Core MTS Businesses
Segment Reporting Information [Line Items]
Pre-tax gain on sale of business														37
Change Healthcare \| Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership interest in Joint Venture (percent)															70.00%
Pre-tax credit representing reduction in TRA liability					$ (90)								90
Loss from equity method investment in Change Healthcare													194	$ 248
Rexall Health \| Third Party Seller of Rexall Health \| CANADA
Segment Reporting Information [Line Items]
Proceeds from escrow settlement related to previous Acquisition	$ 97	$ 125									$ 119	$ 147	$ 97
Services \| Product Concentration Risk \| Revenues \| U.S. Pharmaceutical and Specialty Solutions
Segment Reporting Information [Line Items]
Percentage of total revenue (less than) (as a percent)													1.00%	1.00%	1.00%
Services \| Product Concentration Risk \| Revenues \| European Pharmaceutical Solutions
Segment Reporting Information [Line Items]
Percentage of total revenue (less than) (as a percent)													10.00%	10.00%	10.00%
Services \| Product Concentration Risk \| Revenues \| Medical-Surgical Solutions
Segment Reporting Information [Line Items]
Percentage of total revenue (less than) (as a percent)													1.00%	1.00%	1.00%