Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions					2 Months Ended		3 Months Ended				4 Months Ended		6 Months Ended	9 Months Ended
	Mar. 11, 2025	Oct. 30, 2024	Dec. 13, 2023	Oct. 31, 2023	Mar. 11, 2025	Dec. 13, 2023	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Oct. 30, 2024	Oct. 31, 2023	Dec. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Class of Stock [Line Items]
Purchase of treasury shares														$ 765	$ 750
Retirement of treasury stock														0.0
$250 million share repurchase program [Member]
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
$375 million share repurchase program
Class of Stock [Line Items]
Purchase of treasury shares							$ 375	$ 375
Share Repurchase Programs
Class of Stock [Line Items]
Share Repurchase Program, Excise Tax														$ 15
Share Repurchase Program, Excise Tax														15
Treasury Stock, Common
Class of Stock [Line Items]
Purchase of treasury shares														$ 750
Treasury Stock, Shares, Acquired							(3.0)							(6.0)	(9.0)
Retirement of treasury stock							56.0							56.0
Treasury Stock, Common | $250 million share repurchase program [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired			(0.4)						(2.0)
Treasury shares acquired, average price per share (in usd per share)						$ 103.67			$ 101.66
Treasury Stock, Common | $500 million share repurchase program [Domain]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired				(1.3)						(4.4)
Treasury shares acquired, average price per share (in usd per share)										$ 90.57		$ 88.22
Treasury Stock, Common | $375 million share repurchase program
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	(0.6)	(0.7)					(2.4)	(2.7)
Treasury shares acquired, average price per share (in usd per share)					$ 125.87		$ 125.33				$ 110.10		$ 109.65