Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 399	$ 299	$ 801	$ 610
Other comprehensive income (loss), net of tax:
Net gains (losses) on available-for-sale securities	0	0	0	(1)
Net gains (losses) on derivative instruments	56	109	41	199
Foreign currency translation adjustments	(15)	(43)	(8)	(76)
Total other comprehensive income (loss), net of tax	41	66	33	122
Total comprehensive income	$ 440	$ 365	$ 834	$ 732