Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenues	$ 48,761	$ 44,160	$ 96,307	$ 87,636
Cost of Sales	(45,917)	(41,296)	(90,615)	(82,040)
Gross Profit	2,844	2,864	5,692	5,596
Operating Expenses	(1,890)	(2,077)	(3,807)	(4,128)
Operating Income	954	787	1,885	1,468
Other Income, Net	17	22	30	41
Interest Expense	(91)	(95)	(180)	(191)
Income from Continuing Operations Before Income Taxes	880	714	1,735	1,318
Income Tax Expense	(244)	(223)	(500)	(408)
Income from Continuing Operations	636	491	1,235	910
Loss from Discontinued Operations, Net of Tax	(6)	(14)	(16)	(22)
Net Income	630	477	1,219	888
Net Income Attributable to Noncontrolling Interests	(13)	(8)	(26)	(16)
Net Income Attributable to McKesson Corporation	$ 617	$ 469	$ 1,193	$ 872
Diluted
Continuing operations (in dollars per share)	$ 2.65	$ 2.05	$ 5.15	$ 3.80
Discontinued operations (in dollars per share)	(0.02)	(0.06)	(0.07)	(0.09)
Total (in dollars per share)	2.63	1.99	5.08	3.71
Basic
Continuing operations (in dollars per share)	2.68	2.08	5.21	3.86
Discontinued operations (in dollars per share)	(0.02)	(0.06)	(0.06)	(0.09)
Total (in dollars per share)	2.66	2.02	5.15	3.77
Dividends declared per common share (in dollars per share)	$ 0.28	$ 0.24	$ 0.52	$ 0.48
Weighted Average Common Shares
Diluted (in shares)	235	235	235	235
Basic (in shares)	232	232	232	231