Shareholders' Equity Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions				1 Months Ended	3 Months Ended			4 Months Ended	6 Months Ended
	Oct. 31, 2023	Aug. 18, 2023	Dec. 23, 2022	Jun. 30, 2023	Sep. 30, 2023	Aug. 18, 2023	Sep. 30, 2022	Oct. 31, 2023	Dec. 23, 2022
Class of Stock [Line Items]
Share repurchase program activity					$ 500		$ 1,000
$1 billion share repurchase program
Class of Stock [Line Items]
Share repurchase program activity							$ 1,000
$500 million share repurchase program
Class of Stock [Line Items]
Share repurchase program activity				$ 500	$ 500
Treasury Shares
Class of Stock [Line Items]
Treasury shares acquired (using cost method), shares					5.0		12.0
Treasury Shares | $500 million share repurchase program
Class of Stock [Line Items]
Treasury shares acquired (using cost method), shares		0.9
Treasury shares acquired, average price per share (in usd per share)				$ 87.18		$ 91.15
Treasury Shares | $1 billion share repurchase program
Class of Stock [Line Items]
Treasury shares acquired (using cost method), shares							12.0
Treasury shares acquired, average price per share (in usd per share)							$ 66.74
Treasury Shares | $500 million share repurchase program
Class of Stock [Line Items]
Treasury shares acquired (using cost method), shares			1.6	4.6	4.4
Treasury shares acquired, average price per share (in usd per share)					$ 90.57				$ 73.36
Subsequent Event | Treasury Shares | $500 million share repurchase program
Class of Stock [Line Items]
Treasury shares acquired (using cost method), shares	1.3
Treasury shares acquired, average price per share (in usd per share)								$ 88.22