Consolidated Statements of Other Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 789	$ 837	$ 3,039
Other comprehensive income (loss), net of tax:
Net gains (losses) on available-for-sale securities	(3)	4	(3)
Net gains (losses) on derivative instruments	76	(68)	17
Foreign currency translation adjustments	(8)	64	(34)
Total other comprehensive income (loss), net of tax	65	0	(20)
Total comprehensive income (loss)	$ 854	$ 837	$ 3,019