Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) $ / shares shares	Jun. 30, 2013 USD ($) $ / shares shares
Common shares, Authorized	755,000,000	755,000,000
Preferred shares, Authorized	500,000	500,000
Treasury shares acquired (using cost method), value | $	$ 1,036	$ 673	$ 450
Treasury Shares
Treasury shares acquired (using cost method), shares	13,100,000	9,900,000	10,200,000
Treasury shares acquired (using cost method), value | $	$ 1,036	$ 673	$ 450
Treasury shares acquired, average price per share (in dollars per share) | $ / shares	$ 79.02	$ 67.85	$ 44.11
Three Year Aggregate | Treasury Shares
Treasury shares acquired (using cost method), value | $	$ 2,200
Class A
Common shares, Authorized	750,000,000	750,000,000
Common shares, voting rights per share (text)	one vote	one vote
Common shares, voting rights per share (number of votes per share owned)	1	1
Class B
Common shares, Authorized	5,000,000	5,000,000
Common shares, voting rights per share (text)	one-fifth of one vote	one-fifth of one vote
Common shares, voting rights per share (number of votes per share owned)	0.2	0.2