CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 1,163	$ 287	$ 1,994	$ 1,247
Other comprehensive (loss) income, net of tax
Foreign currency translation adjustments	(5)	34	16	3
Unrealized gain (loss) on cash flow and other hedges	(5)	(9)	9	(9)
Changes in retirement-related benefit plans	0	(2)	(1)	(3)
Other comprehensive (loss) income, net of tax	(10)	23	24	(9)
Comprehensive income	1,153	310	2,018	1,238
Comprehensive income attributable to noncontrolling interests	(53)	(46)	(100)	(91)
Comprehensive income attributable to McKesson Corporation	$ 1,100	$ 264	$ 1,918	$ 1,147