CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Revenues	$ 103,150	$ 93,651	$ 200,977	$ 172,934
Cost of sales	(99,608)	(90,403)	(194,156)	(166,534)
Gross profit	3,542	3,248	6,821	6,400
Selling, distribution, general, and administrative expenses	(2,074)	(2,503)	(4,270)	(4,504)
Claims and litigation charges, net	2	4	2	(108)
Restructuring, impairment, and related charges, net	(63)	(171)	(110)	(181)
Total operating expenses	(2,135)	(2,670)	(4,378)	(4,793)
Operating income	1,407	578	2,443	1,607
Other income, net	62	34	126	164
Interest expense	(74)	(78)	(123)	(153)
Income before income taxes	1,395	534	2,446	1,618
Income tax expense	(232)	(247)	(452)	(371)
Net income	1,163	287	1,994	1,247
Net income attributable to noncontrolling interests	(53)	(46)	(100)	(91)
Net income attributable to McKesson Corporation	$ 1,110	$ 241	$ 1,894	$ 1,156
Earnings per common share attributable to McKesson Corporation
Diluted (in dollars per share)	$ 8.92	$ 1.87	$ 15.16	$ 8.89
Basic (in dollars per share)	$ 8.95	$ 1.88	$ 15.22	$ 8.94
Weighted-average common shares outstanding
Diluted (in shares)	124.4	129.3	124.9	130.0
Basic (in shares)	124.0	128.7	124.5	129.3