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Share-Based Compensation - Components of Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 119 | $ 95 | $ 69
Tax benefit for share-based compensation expense | (18) | (12) | (28)
Share-based compensation expense, net of tax | 101 | 83 | 41
Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | 104 | 75 | 46
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | 7 | 12 | 14
Employee stock purchase plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 8 | $ 8 | $ 9

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