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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended			36 Months Ended
	Mar. 21, 2018 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) shares
Class of Stock [Line Items]
Common shares, authorized | shares		755,000,000	755,000,000		755,000,000
Preferred shares, authorized | shares		500,000	500,000		500,000
Treasury shares acquired | $		$ (550)	$ (600)	$ (651)
Payments for Repurchase of Common Stock | $		550	600	651
Retained earnings decrease | $		(4,645)	(4,967)		$ (4,645)
Treasury Shares
Class of Stock [Line Items]
Treasury shares acquired | $		$ (550)	$ (600)	$ (651)	$ (1,800)
Treasury Stock, Shares, Acquired | shares		(8,400,000)	(8,100,000)	(8,200,000)
Treasury shares acquired, average price per share (in usd per share) | $ / shares		$ 65.30	$ 74.08	$ 78.98
Retirement of Treasury Shares (in shares) | shares			(37,000,000)
Common Class A
Class of Stock [Line Items]
Common shares, authorized | shares		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 | shares		5,000,000	5,000,000		5,000,000
Common Stock, Voting Rights, Votes		0.2
Retirement of Treasury Shares [Member]
Class of Stock [Line Items]
Retirement of Treasury Shares (in shares) | shares			37,000,000
Decrease in Common Shares in Treasury | $			$ 2,500
Decrease in Common Shares, Value | $			302
Retained earnings decrease | $			$ 2,200
Accelerated share repurchase plan | Treasury Shares
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired | shares	(4,300,000)
Payments for Repurchase of Common Stock | $	$ 300
Treasury shares acquired, average price per share (in usd per share) | $ / shares	$ 69.26

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