CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 62,674	$ 55,679
Cost of sales	(59,642)	(52,979)
Gross profit	3,032	2,700
Selling, distribution, general, and administrative expenses	(2,232)	(2,097)
Claims and litigation charges, net	(74)	131
Restructuring, impairment, and related charges	(158)	(56)
Total operating expenses	(2,464)	(2,022)
Operating income	568	678
Other income, net	43	27
Interest expense	(49)	(60)
Income from continuing operations before income taxes	562	645
Income tax expense	(26)	(150)
Income from continuing operations	536	495
Loss from discontinued operations, net of tax	(3)	(1)
Net income	533	494
Net income attributable to noncontrolling interests	(47)	(50)
Net income attributable to McKesson Corporation	$ 486	$ 444
Diluted
Continuing operations (in dollars per share)	$ 3.09	$ 2.72
Discontinued operations (in dollars per share)	(0.02)	0
Total (in dollars per share)	3.07	2.72
Basic
Continuing operations (in dollars per share)	3.13	2.74
Discontinued operations (in dollars per share)	(0.02)	0
Total (in dollars per share)	$ 3.11	$ 2.74
Weighted-average common shares outstanding
Diluted (in shares)	158.1	163.2
Basic (in shares)	156.2	162.0