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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share Reconciliation [Abstract]        
Net income (loss) $ 299 $ 294 $ 610 $ 498
Weighted Average Number of Shares Outstanding, Basic 278 285 279 285
Dilutive potential common shares related to stock award plans and from assumed exercise of stock options 1 2 1 3
Weighted Average Number of Shares Outstanding, Diluted 279 287 280 288
Earnings Per Share, Basic $ 1.08 $ 1.03 $ 2.19 $ 1.75
Earnings Per Share, Diluted $ 1.07 $ 1.02 $ 2.18 $ 1.73