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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, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 151 | $ 119 | $ 95
Tax benefit for share-based compensation expense | (23) | (18) | (12)
Share-based compensation expense, net of tax | 128 | 101 | 83
Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | 137 | 104 | 75
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | 4 | 7 | 12
Employee stock purchase plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 10 | $ 8 | $ 8

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