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Earnings Per Share (Tables)
 12 Months Ended
Mar. 31, 2023
Earnings Per Share Reconciliation [Abstract]  
Computation Of Basic Earnings And Diluted Earnings Per Share The following table summarizes the computations of basic earnings per share (“Basic EPS”) and diluted earnings per share (“Diluted EPS”). Basic EPS is computed as net income divided by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from common shares issuable through stock-based compensation plans including stock options, restricted stock units, market-based restricted stock units, performance-based restricted stock units, and ESPP purchase rights using the treasury stock method.
 Year Ended March 31,
(In millions, except per share amounts)202320222021
Net income$802 $789 $837 
Shares used to compute earnings per share:
Weighted-average common stock outstanding — basic277 284 289 
Dilutive potential common shares related to stock award plans1 2 3 
Weighted-average common stock outstanding — diluted278 286 292 
Earnings per share:
Basic$2.90 $2.78 $2.90 
Diluted$2.88 $2.76 $2.87