CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenues	$ 50,130	$ 47,899	$ 149,820	$ 144,206
Cost of Sales	(47,318)	(45,027)	(141,345)	(135,642)
Gross Profit	2,812	2,872	8,475	8,564
Operating Expenses	(1,981)	(1,952)	(5,802)	(5,759)
Goodwill Impairment Charge	0	0	(290)	0
Operating Income	831	920	2,383	2,805
Other Income, Net	23	13	65	43
Interest Expense	(74)	(87)	(231)	(267)
Income from Continuing Operations Before Income Taxes	780	846	2,217	2,581
Income Tax Expense	(131)	(204)	(570)	(704)
Income from Continuing Operations	649	642	1,647	1,877
Income (Loss) from Discontinued Operations, Net of Tax	(3)	5	(117)	(11)
Net Income	646	647	1,530	1,866
Net Income Attributable to Noncontrolling Interests	(13)	(13)	(48)	(39)
Net Income Attributable to McKesson Corporation	$ 633	$ 634	$ 1,482	$ 1,827
Diluted
Continuing operations (in dollars per share)	$ 2.86	$ 2.71	$ 7.07	$ 7.86
Discontinued operations (in dollars per share)	(0.01)	0.02	(0.51)	(0.05)
Total (in dollars per share)	2.85	2.73	6.56	7.81
Basic
Continuing operations (in dollars per share)	2.89	2.74	7.14	7.95
Discontinued operations (in dollars per share)	(0.02)	0.02	(0.52)	(0.04)
Total (in dollars per share)	2.87	2.76	6.62	7.91
Dividends Declared Per Common Share (in dollars per share)	$ 0.28	$ 0.28	$ 0.84	$ 0.80
Weighted Average Common Shares
Diluted (in shares)	222	232	226	234
Basic (in shares)	221	230	224	231