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Stock-Based Compensation, Employee Benefit Plans, and Stock Repurchase Program - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 642	$ 584	$ 548
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	14	8	7
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	457	418	367
Marketing and sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	56	52	59
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 115	$ 106	$ 115

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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