CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 967	$ 310	$ 1,776	$ 843
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(192)	(48)	390	(24)
Unrealized gains on cash flow hedges	18	8	36	8
Changes in retirement-related benefit plans	2	2	38	4
Other comprehensive income (loss), net of tax	(172)	(38)	464	(12)
Comprehensive income	795	272	2,240	831
Comprehensive income attributable to noncontrolling interests	(35)	(43)	(126)	(93)
Comprehensive income attributable to McKesson Corporation	$ 760	$ 229	$ 2,114	$ 738