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Share-based Compensation - Schedule of Share-Based Compensation Cost (Details) - USD ($) $ in Millions | 3 Months Ended
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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

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- Definition Amount, after tax, of expense for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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