Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended			36 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) shares
Class of Stock [Line Items]
Treasury shares acquired | $	$ 200	$ 350	$ 600
Payments for Repurchase of Common Stock | $	200	350	600
Retained earnings decrease | $	$ (1,205)	$ (1,170)		$ (1,170)
Common shares, authorized | shares	755,000,000	755,000,000		755,000,000
Common Class A
Class of Stock [Line Items]
Common shares, authorized | shares	750,000,000
Common Stock, Voting Rights, Votes	1
Common Class B
Class of Stock [Line Items]
Common shares, authorized | shares	5,000,000
Treasury Shares
Class of Stock [Line Items]
Treasury shares acquired | $	$ 200	$ 350	$ 600	$ 1,150
Treasury Stock, Shares, Acquired | shares	3,700,000	7,000,000	11,500,000
Payments for Repurchase of Common Stock | $	$ 200
Treasury shares acquired, average price per share (in usd per share) | $ / shares	$ 54.40	$ 48.00	$ 52.32
Treasury Stock Acquired Shares | shares		7,300,000