CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenues	$ 79,283	$ 74,483
Cost of sales	(76,131)	(71,461)
Gross profit	3,152	3,022
Selling, distribution, general, and administrative expenses	(2,001)	(1,870)
Claims and litigation charges, net	(112)	0
Restructuring, impairment, and related charges, net	(10)	(52)
Total operating expenses	(2,123)	(1,922)
Operating income	1,029	1,100
Other income, net	130	38
Interest expense	(75)	(47)
Income before income taxes	1,084	1,091
Income tax expense	(124)	(94)
Net income	960	997
Net income attributable to noncontrolling interests	(45)	(39)
Net income attributable to McKesson Corporation	$ 915	$ 958
Earnings per common share attributable to McKesson Corporation
Diluted (in usd per share)	$ 7.00	$ 7.02
Basic (in usd per share)	$ 7.04	$ 7.07
Weighted-average common shares outstanding
Diluted (in usd per share)	130.7	136.6
Basic (in shares)	129.8	135.5