Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions	2 Months Ended	3 Months Ended			4 Months Ended	12 Months Ended			36 Months Ended
	Mar. 11, 2025 $ / shares	Mar. 31, 2025 shares	Dec. 31, 2024 shares	Sep. 30, 2023 shares	Oct. 30, 2024 $ / shares	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2023 USD ($)
Class of Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method | $						$ 757	$ 759	$ 2,007
Share repurchase program activity | $						$ 765	$ 750	2,000
Common shares, authorized						755,000,000	755,000,000
Treasury Stock, Shares, Retired						0
Preferred shares, authorized						500,000	500,000
Share Repurchase Programs
Class of Stock [Line Items]
Share Repurchase Program, Excise Tax | $						$ 15
Common Class A
Class of Stock [Line Items]
Common shares, authorized						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
Treasury Shares
Class of Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method | $						$ 757	$ 859	$ 1,907
Treasury Stock, Shares, Acquired						6,400,000	9,000,000.0	24,600,000
Share repurchase program activity | $									$ 3,500
Treasury Stock, Shares, Retired						56,000,000
Treasury Shares | $375 million share repurchase program
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired		3,000,000	3,400,000
Treasury shares acquired, average price per share (in usd per share) | $ / shares	$ 125.87				$ 110.10
Treasury Shares | $500 million share repurchase program [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired				900,000				4,600,000
Treasury shares acquired, average price per share (in usd per share) | $ / shares							$ 91.15	$ 87.18
Treasury Shares | $250 million share repurchase program
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired							5,700,000	3,200,000
Treasury shares acquired, average price per share (in usd per share) | $ / shares							$ 88.22	$ 77.50
Treasury Shares | Second $250 million share repurchase program [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired								3,200,000
Treasury shares acquired, average price per share (in usd per share) | $ / shares								$ 77.27
Treasury Shares | $1 billion share repurchase program
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired							2,400,000	13,600,000
Treasury shares acquired, average price per share (in usd per share) | $ / shares							$ 103.67	$ 73.36