CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 3,160	$ 3,722	$ 1,287
Other comprehensive income, net of tax
Foreign currency translation adjustments	(7)	674	60
Unrealized gains (losses) on cash flow and other hedges	39	(63)	14
Changes in retirement-related benefit plans	(8)	62	41
Other comprehensive income, net of tax	24	673	115
Comprehensive income	3,184	4,395	1,402
Comprehensive income attributable to noncontrolling interests	(158)	(206)	(172)
Comprehensive income attributable to McKesson Corporation	$ 3,026	$ 4,189	$ 1,230