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Segments of Business - Schedule of Long-lived Assets By Geographic Areas (Details) - USD ($) $ in Millions	Sep. 30, 2025	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total long-lived assets	$ 3,357	$ 3,183
United States
Segment Reporting Information [Line Items]
Total long-lived assets	3,096	2,877
Foreign
Segment Reporting Information [Line Items]
Total long-lived assets	$ 261	$ 306

X

- Definition

Property, Plant and Equipment, Including Net Capitalized Software

+ References

No definition available.

+ Details

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Namespace Prefix:	mck_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: