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Redeemable Noncontrolling Interests and Noncontrolling Interests - Schedule of Changes in Noncontrolling Interests and Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ 480
Net income attributable to noncontrolling interests	162	$ 173	$ 199
Payments to noncontrolling interests	(150)	(155)	(177)
Reclassification of McKesson Europe AG redeemable noncontrolling interests		287
Formation of SCRI Oncology, LLC	247
Derecognition of noncontrolling interests in McKesson Europe AG	(382)
Ending balance	367	480
Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	480	196	217
Net income attributable to noncontrolling interests	162	165	156
Other comprehensive income	44	(4)	0
Payments to noncontrolling interests	(150)	(155)	(177)
Reclassification of recurring compensation to other accrued liabilities	(5)	(7)	0
Exercise of put right		0	0
Reclassification of McKesson Europe AG redeemable noncontrolling interests		287
Formation of SCRI Oncology, LLC	225
Derecognition of noncontrolling interests in McKesson Europe AG	(382)
Other	(7)	(2)	0
Ending balance	367	480	196
Redeemable Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Redeemable Noncontrolling Interest, Beginning balance	0	1,271	1,402
Net income (loss) attributable to redeemable noncontrolling interest	0	8	43
Other comprehensive income	0	3	(79)
Payments to noncontrolling interests	0	0	0
Reclassification of recurring compensation to other accrued liabilities	0	(8)	(43)
Exercise of put right		(983)	(49)
Reclassification of McKesson Europe AG redeemable noncontrolling interests		(287)
Formation of SCRI Oncology, LLC	0
Derecognition of noncontrolling interests in McKesson Europe AG	0
Other	0	(4)	(3)
Redeemable Noncontrolling Interest, Ending balance	$ 0	$ 0	$ 1,271

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