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Noncontrolling Interests - Schedule of Changes in Noncontrolling Interests and Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ (1,599)	$ (1,490)	$ (1,792)
Net income attributable to noncontrolling interests	186	158	162
Payments to noncontrolling interests	(178)	(152)	(150)
Formation of SCRI Oncology			247
Derecognition of noncontrolling interests in McKesson Europe			(382)
Ending balance	(1,694)	(1,599)	(1,490)
Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	372	367	480
Net income attributable to noncontrolling interests	186	158	162
Other comprehensive income			44
Payments to noncontrolling interests	(178)	(152)	(150)
Reclassification of recurring compensation to other accrued liabilities			(5)
Formation of SCRI Oncology			225
Derecognition of noncontrolling interests in McKesson Europe			(382)
Other		(1)	(7)
Ending balance	$ 380	$ 372	$ 367

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