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Share-Based Compensation - Components of Share-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]
Share-based compensation expense	$ 226	$ 182	$ 162
Tax benefit for share-based compensation expense	(85)	(72)	(87)
Share-based compensation expense, net of tax	141	110	75
Restricted stock unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	211	168	149
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 15	$ 14	$ 13

X

- Definition

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

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