CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenues	$ 308,951	$ 276,711	$ 263,966
Cost of sales	(296,123)	(264,353)	(250,836)
Gross profit	12,828	12,358	13,130
Selling, distribution, general, and administrative expenses	(8,657)	(7,776)	(10,537)
Claims and litigation charges, net	(147)	8	(274)
Restructuring, impairment, and related charges, net	(115)	(209)	(281)
Total operating expenses	(8,919)	(7,977)	(11,092)
Operating income	3,909	4,381	2,038
Other income, net	132	497	259
Loss on debt extinguishment	0	0	(191)
Interest expense	(252)	(248)	(178)
Income from continuing operations before income taxes	3,789	4,630	1,928
Income tax expense	(629)	(905)	(636)
Income from continuing operations	3,160	3,725	1,292
Loss from discontinued operations, net of tax	0	(3)	(5)
Net income	3,160	3,722	1,287
Net income attributable to noncontrolling interests	(158)	(162)	(173)
Net income attributable to McKesson Corporation	$ 3,002	$ 3,560	$ 1,114
Diluted
Continuing operations (in dollars per share)	$ 22.39	$ 25.05	$ 7.26
Discontinued operations (in dollars per share)	0	(0.02)	(0.03)
Total (in dollars per share)	22.39	25.03	7.23
Basic
Continuing operations (in dollars per share)	22.54	25.25	7.35
Discontinued operations (in dollars per share)	0	(0.02)	(0.03)
Total (in dollars per share)	$ 22.54	$ 25.23	$ 7.32
Weighted-average common shares outstanding
Diluted (in shares)	134.1	142.2	154.1
Basic (in shares)	133.2	141.1	152.3