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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 1,121	$ 1,273	$ 802
Other comprehensive income (loss), net of tax:
Net gains (losses) on available-for-sale securities	0	1	2
Net gains (losses) on derivative instruments	1	(3)	(34)
Foreign currency translation adjustments	(16)	(3)	(50)
Total other comprehensive income (loss), net of tax	(15)	(5)	(82)
Total comprehensive income	$ 1,106	$ 1,268	$ 720

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