Earnings Per Share (Computation Of Basic Earnings And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share Reconciliation [Abstract]
Net income	$ 399	$ 299	$ 801	$ 610
Weighted average number of shares outstanding, basic (in shares)	271	278	272	279
Dilutive potential common shares related to stock award plans (in shares)	1	1	1	1
Weighted-average common stock outstanding - diluted (in shares)	272	279	273	280
Basic (in dollars per share)	$ 1.47	$ 1.08	$ 2.94	$ 2.19
Diluted (in dollars per share)	$ 1.47	$ 1.07	$ 2.93	$ 2.18