Income Taxes - Provision For (Benefit From) Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Federal, Current	$ 138	$ 570	$ 203
State, Current	20	92	36
Foreign, Current	76	75	381
Total, Current	234	737	620
Federal, Deferred	85	(339)	(190)
State, Deferred	9	(76)	(26)
Foreign, Deferred	(12)	202	(112)
Total, Deferred	82	(213)	(328)
Total, Federal	223	231	13
Total, State	29	16	10
Total, Foreign	64	277	269
Total provision for (benefit from) income taxes	$ 316	$ 524	$ 292