CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenues	$ 66,576	$ 60,808	$ 129,250	$ 116,487
Cost of sales	(63,224)	(57,808)	(122,866)	(110,787)
Gross profit	3,352	3,000	6,384	5,700
Selling, distribution, general, and administrative expenses	(2,669)	(2,237)	(4,901)	(4,334)
Claims and litigation charges, net	(112)	0	(186)	131
Goodwill impairment charges	0	(69)	0	(69)
Restructuring, impairment, and related charges	(32)	(60)	(190)	(116)
Total operating expenses	(2,813)	(2,366)	(5,277)	(4,388)
Operating income	539	634	1,107	1,312
Other income, net	139	71	182	98
Loss on debt extinguishment	(191)	0	(191)	0
Interest expense	(45)	(50)	(94)	(110)
Income from continuing operations before income taxes	442	655	1,004	1,300
Income tax expense	(132)	(28)	(158)	(178)
Income from continuing operations	310	627	846	1,122
Loss from discontinued operations, net of tax	0	0	(3)	(1)
Net income	310	627	843	1,121
Net income attributable to noncontrolling interests	(43)	(50)	(90)	(100)
Net income attributable to McKesson Corporation	$ 267	$ 577	$ 753	$ 1,021
Diluted
Continuing operations (in dollars per share)	$ 1.71	$ 3.54	$ 4.82	$ 6.26
Discontinued operations (in dollars per share)	0	0	(0.02)	0
Total (in dollars per share)	1.71	3.54	4.80	6.26
Basic
Continuing operations (in dollars per share)	1.73	3.56	4.87	6.31
Discontinued operations (in dollars per share)	0	0	(0.02)	(0.01)
Total (in dollars per share)	$ 1.73	$ 3.56	$ 4.85	$ 6.30
Weighted-average common shares outstanding
Diluted (in shares)	155.8	163.2	156.9	163.2
Basic (in shares)	154.1	162.0	155.1	162.0