Consolidated Statements of Other Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 802	$ 789	$ 837
Other comprehensive income (loss), net of tax:
Net gains (losses) on available-for-sale securities	2	(3)	4
Net gains (losses) on derivative instruments	(34)	76	(68)
Foreign currency translation adjustments	(50)	(8)	64
Total other comprehensive income (loss), net of tax	(82)	65	0
Total comprehensive income	$ 720	$ 854	$ 837