Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended			36 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) shares
Class of Stock [Line Items]
Common shares, authorized	755,000,000	755,000,000		755,000,000
Preferred shares, authorized	500,000	500,000		500,000
Treasury shares acquired (using cost method), value | $	$ 651	$ 1,036	$ 673
Treasury Shares
Class of Stock [Line Items]
Treasury shares acquired (using cost method), value | $	$ 651	$ 1,036	$ 673	$ 2,400
Treasury shares acquired (using cost method), shares	8,200,000	13,100,000	9,900,000
Treasury shares acquired, average price per share (in usd per share) | $ / shares	$ 78.98	$ 79.02	$ 67.85
Common Class A
Class of Stock [Line Items]
Common shares, authorized	750,000,000	750,000,000		750,000,000
Common Stock, Voting Rights, Votes	1
Common Class B
Class of Stock [Line Items]
Common shares, authorized	5,000,000	5,000,000		5,000,000
Common Stock, Voting Rights, Votes	0.2