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Stock Incentive Plans - Schedule of Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |
Total share-based compensation cost | $ 6 | $ 9 | $ 42 | $ 57
Related income tax benefit | 2 | (3) | 7 | 8
Total intrinsic value of options exercised | 0 | 1 | 0 | 8
Tax benefits from exercised stock options and awards | $ 1 | $ 3 | $ 5 | $ 13

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