Statements of Stockholders' Equity (Parenthetical) - $ / shares shares in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]
Treasury stock, shares repurchased	8.2	6.2	6.5
Dividends (in dollars per share)	$ 3.70	$ 3.52	$ 3.06