Condensed Consolidated Balance Sheets (Parentheticals) - $ / shares shares in Millions	Jun. 30, 2015	Mar. 31, 2015
McKesson Corporation Stockholders’ Equity
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100	100
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	800	800
Common stock, shares issued (in shares)	385	384
Treasury stock, shares (in shares)	153	152