Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2022
Class of Stock [Line Items]
Purchase of treasury shares			$ 800	$ 0
$500 million share repurchase program [Domain]
Class of Stock [Line Items]
Purchase of treasury shares		$ 500
$300 million share repurchase program [Member]
Class of Stock [Line Items]
Purchase of treasury shares	$ 300
Treasury shares acquired, average price per share (in usd per share)	$ 50.30
Treasury Shares
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	(7.0)		(15.0)
Treasury Shares | $500 million share repurchase program [Domain]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired		(7.8)	(2.0)
Treasury shares acquired, average price per share (in usd per share)		$ 51.53	$ 51.10
Treasury Shares | $300 million share repurchase program [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	(4.8)
Treasury Shares | $300 million share repurchase program [Member] | Subsequent Event
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired					(1.3)
Treasury shares acquired, average price per share (in usd per share)					$ 49.39