Share-based Compensation - Schedule of Share-Based Compensation Cost (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Pre-tax share-based compensation cost | $ 1,052 | $ 820 | $ 1,070 |
| Less: income tax effect | 168 | 144 | 210 |
| Net share-based compensation cost | 884 | 676 | 860 |
| Cost of sales | |||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Pre-tax share-based compensation cost | 29 | 26 | 41 |
| Research and development | |||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Pre-tax share-based compensation cost | 762 | 576 | 728 |
| Selling, general and administrative | |||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Pre-tax share-based compensation cost | $ 261 | $ 218 | $ 301 |