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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
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share Reconciliation [Abstract]      
Net income $ 802 $ 789 $ 837
Weighted-average common stock outstanding - basic (in shares) 277 284 289
Dilutive potential common shares related to stock award plans (in shares) 1 2 3
Weighted average common stock outstanding - diluted (in shares) 278 286 292
Basic (in dollars per share) $ 2.90 $ 2.78 $ 2.90
Diluted (in dollars per share) $ 2.88 $ 2.76 $ 2.87