Share-based Compensation - Schedule of Share-Based Compensation Cost (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Pre-tax share-based compensation cost | $ 343 | $ 241 |
| Less: income tax effect | 72 | 46 |
| Net share-based compensation cost | 271 | 195 |
| Income Statement Location [Axis]: us-gaap:CostOfRevenue | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Pre-tax share-based compensation cost | 9 | 7 |
| Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Pre-tax share-based compensation cost | 247 | 174 |
| Income Statement Location [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Pre-tax share-based compensation cost | $ 87 | $ 60 |