Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions						3 Months Ended					9 Months Ended
	Apr. 20, 2026	Dec. 15, 2025	Oct. 31, 2025	Mar. 11, 2025	Oct. 30, 2024	Mar. 31, 2026	Dec. 31, 2025	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Mar. 31, 2026	Mar. 31, 2025
Class of Stock [Line Items]
Purchase of treasury shares											$ 1,008	$ 765
Retirement of treasury stock												0
$375 million share repurchase program
Class of Stock [Line Items]
Purchase of treasury shares							$ 375	$ 375	$ 375	$ 375
Share Repurchase Programs
Class of Stock [Line Items]
Share Repurchase Program, Excise Tax											8	$ 15
Share Repurchase Program, Excise Tax											8	15
$250 million share repurchase program [Member]
Class of Stock [Line Items]
Purchase of treasury shares						$ 250
Treasury Stock, Common
Class of Stock [Line Items]
Purchase of treasury shares											$ 1,000	$ 750
Treasury Stock, Shares, Acquired						(1,000,000)			(3,000,000)		(5,000,000)	(6,000,000)
Retirement of treasury stock						56,000,000						56,000,000
Treasury Stock, Common | $375 million share repurchase program
Class of Stock [Line Items]
Treasury shares acquired, average price per share (in usd per share)		$ 200.00	$ 151.88	$ 125.87	$ 110.10		$ 190.22	$ 148.12	$ 125.33	$ 109.65
Treasury Stock, Common | $250 million share repurchase program [Member]
Class of Stock [Line Items]
Treasury shares acquired, average price per share (in usd per share)						$ 215.42
Treasury Stock, Common | $250 million share repurchase program [Member] | Subsequent Event
Class of Stock [Line Items]
Treasury shares acquired, average price per share (in usd per share)	$ 209.55
Treasury Stock, Common | $375 million share repurchase program
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired		(300,000)	(400,000)	(600,000)	(700,000)		(1,600,000)	(2,000,000.0)	(2,400,000)	(2,700,000)
Treasury Stock, Common | $250 million share repurchase program [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired						(900,000)
Treasury Stock, Common | $250 million share repurchase program [Member] | Subsequent Event
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	(300,000)