Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions								2 Months Ended	3 Months Ended						6 Months Ended				9 Months Ended
	Dec. 13, 2023	Nov. 02, 2023	Oct. 31, 2023	Aug. 16, 2023	Feb. 28, 2023	Jan. 13, 2023	Dec. 23, 2022	Feb. 28, 2023	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 23, 2022	Mar. 31, 2024	Mar. 31, 2023
Class of Stock [Line Items]
Purchase of treasury shares																			$ 750	$ 1,500
$250 million share repurchase program [Member]
Class of Stock [Line Items]
Purchase of treasury shares									$ 250			$ 250
$300 million share repurchase program
Class of Stock [Line Items]
Purchase of treasury shares													$ 250
$500 million share repurchase program [Domain]
Class of Stock [Line Items]
Purchase of treasury shares										$ 500	$ 500			$ 1,000
Treasury Stock, Common
Class of Stock [Line Items]
Purchase of treasury shares																			$ 750	$ 1,500
Treasury Stock, Shares, Acquired												(4.0)							(9.0)	(20.0)
Treasury Stock, Common | $250 million share repurchase program [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	(0.4)				(0.6)				(2.0)			(2.6)
Treasury shares acquired, average price per share (in usd per share)		$ 101.66						$ 77.27	$ 103.67			$ 77.03
Treasury Stock, Common | $300 million share repurchase program
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired						(0.6)							(2.6)
Treasury shares acquired, average price per share (in usd per share)													$ 76.58				$ 77.50
Treasury Stock, Common | $500 million share repurchase program [Domain]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired			(1.3)	(0.9)			(1.6)			(4.4)	(4.6)			(12.0)
Treasury shares acquired, average price per share (in usd per share)										$ 90.57	$ 87.18			$ 66.74	$ 88.22	$ 91.15		$ 73.36