CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 960	$ 997
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(31)	52
Unrealized gains on cash flow and other hedges	0	7
Changes in retirement-related benefit plans	(1)	(2)
Other comprehensive income (loss), net of tax	(32)	57
Comprehensive income	928	1,054
Comprehensive income attributable to noncontrolling interests	(45)	(39)
Comprehensive income attributable to McKesson Corporation	$ 883	$ 1,015