CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenues	$ 57,616	$ 53,075	$ 113,344	$ 105,682
Cost of Sales	(54,749)	(50,271)	(107,690)	(100,099)
Gross Profit	2,867	2,804	5,654	5,583
Operating Expenses	(2,196)	(2,033)	(4,326)	(4,063)
Goodwill Impairment Charges	0	0	0	(570)
Restructuring, Impairment and Related Charges	(45)	(82)	(68)	(178)
Total Operating Expenses	(2,241)	(2,115)	(4,394)	(4,811)
Operating Income	626	689	1,260	772
Other Income (Expense), Net	(78)	20	(41)	60
Equity Earnings and Charges from Investment in Change Healthcare Joint Venture	(1,454)	(56)	(1,450)	(112)
Interest Expense	(64)	(66)	(120)	(127)
Income (Loss) from Continuing Operations Before Income Taxes	(970)	587	(351)	593
Income Tax Benefit (Expense)	294	(35)	158	(122)
Income (Loss) from Continuing Operations	(676)	552	(193)	471
Income (Loss) from Discontinued Operations, Net of Tax	(1)	1	(7)	2
Net Income (Loss)	(677)	553	(200)	473
Net Income Attributable to Noncontrolling Interests	(53)	(54)	(107)	(112)
Net Income (Loss) Attributable to McKesson Corporation	$ (730)	$ 499	$ (307)	$ 361
Diluted
Continuing operations (in dollars per share)	$ (3.99)	$ 2.51	$ (1.62)	$ 1.79
Discontinued operations (in dollars per share)	0	0	(0.03)	0.01
Total (in dollars per share)	(3.99)	2.51	(1.65)	1.80
Basic
Continuing operations (in dollars per share)	(3.99)	2.52	(1.62)	1.80
Discontinued operations (in dollars per share)	0	0	(0.03)	0.01
Total (in dollars per share)	$ (3.99)	$ 2.52	$ (1.65)	$ 1.81
Weighted Average Common Shares
Diluted (in shares)	183	199	185	201
Basic (in shares)	183	198	185	200