Condensed Consolidated Balance Sheets (Parentheticals) (USD $)	Jun. 30, 2014	Mar. 31, 2014
McKesson Corporation Stockholders' Equity
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	800,000,000	800,000,000
Common stock, shares issued	383,000,000	381,000,000
Treasury stock, shares	151,000,000	150,000,000