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Share-based Compensation - Schedule of Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax share-based compensation cost | $ 265 | $ 218 | $ 506 | $ 400
Less: income tax effect | 48 | 30 | 94 | 42
Net share-based compensation cost | 217 | 188 | 412 | 358
Cost of sales |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax share-based compensation cost | 7 | 7 | 14 | 13
Research and development |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax share-based compensation cost | 197 | 154 | 371 | 283
Selling, general and administrative expenses |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax share-based compensation cost | $ 61 | $ 57 | $ 121 | $ 104

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