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Stock Incentive Plans - Schedule of Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |  |  |  |
Total share-based compensation cost | $ 26 | $ 20 | $ 51 | $ 36
Related income tax benefit | 4 | 3 | 7 | 5
Total intrinsic value of options exercised | 1 | 0 | 6 | 0
Tax benefits from exercised stock options and awards | $ 4 | $ 1 | $ 15 | $ 4

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