CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 630	$ 1,120	$ 2,330	$ 2,896
Other comprehensive income, net of tax
Foreign currency translation adjustments	72	252	60	642
Unrealized gains (losses) on cash flow and other hedges	5	(65)	37	(29)
Changes in retirement-related benefit plans	(2)	28	(4)	66
Other comprehensive income, net of tax	75	215	93	679
Comprehensive income	705	1,335	2,423	3,575
Comprehensive income attributable to noncontrolling interests	(41)	(41)	(119)	(167)
Comprehensive income attributable to McKesson Corporation	$ 664	$ 1,294	$ 2,304	$ 3,408