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Share-Based Compensation - Schedule of Components of Share-Based Compensation Expense and Related Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 247 $ 226 $ 182
Tax benefit for share-based compensation expense (72) (85) (72)
Share-based compensation expense, net of tax 175 141 110
Restricted stock unit awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 231 211 168
Employee stock purchase plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 16 $ 15 $ 14