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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, 2025
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share Reconciliation [Abstract]      
Net income $ 1,121 $ 1,273 $ 802
Weighted-average common stock outstanding - basic (in shares) 262 270 277
Dilutive potential common shares related to stock award plans (in shares) 2 2 1
Weighted average common stock outstanding - diluted (in shares) 264 272 278
Basic (in dollars per share) $ 4.28 $ 4.71 $ 2.90
Diluted (in dollars per share) $ 4.25 $ 4.68 $ 2.88