Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares shares in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Statement of Stockholders' Equity [Abstract]
Treasury stock acquired (in shares)	4.9	2.1	5.7
Treasury stock reissued (in shares)	3.1	2.2	4.4
Dividends declared (in dollars per share)	$ 1.32	$ 1.2	$ 1.08