CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenues	$ 49,957	$ 48,761	$ 99,690	$ 96,307
Cost of Sales	(47,201)	(45,917)	(94,027)	(90,615)
Gross Profit	2,756	2,844	5,663	5,692
Operating Expenses	(1,886)	(1,890)	(3,821)	(3,807)
Goodwill impairment charge	(290)	0	(290)	0
Operating Income	580	954	1,552	1,885
Other Income, Net	23	17	42	30
Interest Expense	(78)	(91)	(157)	(180)
Income from Continuing Operations Before Income Taxes	525	880	1,437	1,735
Income Tax Expense	(200)	(244)	(439)	(500)
Income from Continuing Operations	325	636	998	1,235
Loss from Discontinued Operations, Net of Tax	(1)	(6)	(114)	(16)
Net Income	324	630	884	1,219
Net Income Attributable to Noncontrolling Interests	(17)	(13)	(35)	(26)
Net Income Attributable to McKesson Corporation	$ 307	$ 617	$ 849	$ 1,193
Diluted
Continuing operations (in dollars per share)	$ 1.35	$ 2.65	$ 4.22	$ 5.15
Discontinued operations (in dollars per share)	(0.01)	(0.02)	(0.50)	(0.07)
Total (in dollars per share)	1.34	2.63	3.72	5.08
Basic
Continuing operations (in dollars per share)	1.36	2.68	4.27	5.21
Discontinued operations (in dollars per share)	0.00	(0.02)	(0.51)	(0.06)
Total (in dollars per share)	1.36	2.66	3.76	5.15
Dividends Declared Per Common Share (in dollars per share)	$ 0.28	$ 0.28	$ 0.56	$ 0.52
Weighted Average Common Shares
Diluted (in shares)	228	235	228	235
Basic (in shares)	226	232	226	232