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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share Reconciliation [Abstract]        
Net income $ 294 $ 399 $ 574 $ 801
Weighted average number of shares outstanding, basic (in shares) 264 271 265 272
Dilutive potential common shares related to stock award plans (in shares) 2 1 2 1
Weighted-average common stock outstanding - diluted (in shares) 266 272 267 273
Basic (in dollars per share) $ 1.11 $ 1.47 $ 2.17 $ 2.94
Diluted (in dollars per share) $ 1.11 $ 1.47 $ 2.15 $ 2.93