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
	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share Reconciliation [Abstract]
Net income (loss)	$ 311	$ 204
Weighted Average Number of Shares Outstanding, Basic	279	286
Dilutive potential common shares related to stock award plans and from assumed exercise of stock options	2	3
Weighted Average Number of Shares Outstanding, Diluted	281	289
Earnings Per Share, Basic	$ 1.11	$ 0.71
Earnings Per Share, Diluted	$ 1.11	$ 0.71