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Stock-Based Compensation, Employee Benefit Plans, and Stock Repurchase Program - Schedule of Stock Repurchase Program (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock repurchased and retired during period, value $ 2,520 $ 1,308 $ 1,295
Total      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock repurchased and retired during period (in shares) 17.6 10.0 10.4
Stock repurchased and retired during period, value $ 2,500 $ 1,300 $ 1,295
November 2020 Program      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock repurchased and retired during period (in shares) 0.0 0.0 5.1
Stock repurchased and retired during period, value $ 0 $ 0 $ 650
August 2022 Program      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock repurchased and retired during period (in shares) 1.2 10.0 5.3
Stock repurchased and retired during period, value $ 152 $ 1,300 $ 645
May 2024 Program      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock repurchased and retired during period (in shares) 16.4 0.0 0.0
Stock repurchased and retired during period, value $ 2,348 $ 0 $ 0