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Stock Incentive Plans - Schedule of Stock-Based Compensation (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Share-Based Payment Arrangement [Abstract] |  |  |
Total share-based compensation cost | $ 79 | $ 109 | $ 108
Related income tax benefit | 13 | 16 | 18
Total intrinsic value of options exercised | 0 | 0 | 1
Tax benefits from exercised stock options and awards | $ 8 | $ 14 | $ 12

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