Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012
Income Statement [Abstract]
Revenues	$ 137,609	[1]	$ 122,069	[1]	$ 122,321	[1]
Cost of Sales	(129,300)		(115,221)		(115,919)
Gross Profit	8,309		6,848		6,402
Operating Expenses
Selling, distribution and administrative expenses	(5,418)		(4,099)		(3,727)
Research and development	(456)		(433)		(402)
Litigation charges	(68)		(72)		(149)
Gain on business combination	0		81		0
Total Operating Expenses	(5,942)		(4,523)		(4,278)
Operating Income	2,367		2,325		2,124
Other Income, Net	32		34		20
Impairment of an Equity Investment	0		(191)		0
Interest Expense	(303)		(240)		(251)
Income from Continuing Operations Before Income Taxes	2,096		1,928		1,893
Income Tax Expense	(742)		(581)		(514)
Income from continuing operations	1,354		1,347		1,379
Income (Loss) from Discontinued Operations, Net of Tax	(96)		(9)		24
Net Income	1,258		1,338		1,403
Net loss attributable to noncontrolling interests	5		0		0
Net Income Attributable to McKesson	$ 1,263		$ 1,338		$ 1,403
Diluted
Continuing operations	$ 5.83	[2]	$ 5.62	[2]	$ 5.49	[2]
Discontinued operations	$ (0.42)	[2]	$ (0.03)	[2]	$ 0.10	[2]
Total	$ 5.41	[2]	$ 5.59	[2]	$ 5.59	[2]
Basic
Continuing operations	$ 5.93	[2]	$ 5.74	[2]	$ 5.60	[2]
Discontinued operations	$ (0.42)	[2]	$ (0.03)	[2]	$ 0.10	[2]
Total	$ 5.51	[2]	$ 5.71	[2]	$ 5.70	[2]
Weighted Average Common Shares
Diluted	233		239		251
Basic	229		235		246

[1] Net revenues were attributed to geographic areas based on the customers’ shipment locations.

[2] Certain computations may reflect rounding adjustments.