Condensed Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Income Statement [Abstract]
Revenues	$ 44,058		$ 32,239
Cost of Sales	(41,261)		(30,309)
Gross Profit	2,797		1,930
Operating Expenses	(2,109)		(1,260)
Litigation Charges	0		(15)
Total Operating Expenses	(2,109)		(1,275)
Operating Income	688		655
Other Income, Net	20		6
Interest Expense	(101)		(59)
Income from Continuing Operations Before Income Taxes	607		602
Income Tax Expense	(182)		(174)
Income from Continuing Operations	425		428
Loss from discontinued operations, net of tax	(14)		(4)
Net Income	411		424
Net Income Attributable to Noncontrolling Interests	(8)		0
Net income attributable to McKesson	$ 403		$ 424
Earnings (Loss) Per Common Share Attributable To McKesson (Diluted)
Continuing operations	$ 1.78	[1]	$ 1.84	[1]
Discontinued operations	$ (0.06)	[1]	$ (0.01)	[1]
Total	$ 1.72	[1]	$ 1.83	[1]
Earnings (Loss) Per Common Share Attributable To McKesson (Basic)
Continuing operations	$ 1.81	[1]	$ 1.88	[1]
Discontinued operations	$ (0.06)	[1]	$ (0.02)	[1]
Total	$ 1.75	[1]	$ 1.86	[1]
Dividends Declared Per Common Share	$ 0.24		$ 0.20
Weighted Average Common Shares
Diluted	235		232
Basic	231		227

[1] Certain computations may reflect rounding adjustments.