CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenues	$ 67,154	$ 62,674
Cost of sales	(64,131)	(59,642)
Gross profit	3,023	3,032
Selling, distribution, general, and administrative expenses	(1,959)	(2,232)
Claims and litigation charges, net	(5)	(74)
Restructuring, impairment, and related charges, net	23	158
Total operating expenses	(1,987)	(2,464)
Operating income	1,036	568
Other income, net	15	43
Interest expense	(45)	(49)
Income from continuing operations before income taxes	1,006	562
Income tax expense	(199)	(26)
Income from continuing operations	807	536
Income (loss) from discontinued operations, net of tax	2	(3)
Net income	809	533
Net income attributable to noncontrolling interests	(41)	(47)
Net income attributable to McKesson Corporation	$ 768	$ 486
Diluted
Continuing operations (in usd per share)	$ 5.25	$ 3.09
Discontinued operations (in usd per share)	0.01	(0.02)
Total (in dollars per share)	5.26	3.07
Basic
Continuing operations (in usd per share)	5.31	3.13
Discontinued operations (in usd per share)	0.01	(0.02)
Total (in dollars per share)	$ 5.32	$ 3.11
Weighted-average common shares outstanding
Diluted (in usd per share)	145.9	158.1
Basic (in shares)	144.2	156.2