Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 290	$ 204	$ 1,091	$ 814
Other comprehensive income (loss), net of tax:
Net gains (losses) on available-for-sale securities	1	2	1	1
Net gains (losses) on derivative instruments	(69)	(199)	(28)	0
Foreign currency translation adjustments	18	23	10	(53)
Total other comprehensive income (loss), net of tax	(50)	(174)	(17)	(52)
Total comprehensive income	$ 240	$ 30	$ 1,074	$ 762