Cash and Cash Equivalents and Investments in Marketable Securities - Additional Information (Details) - USD ($)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Marketable Securities [Abstract]
Fair value option elected	$ 829,000,000	$ 778,000,000
Available-for-sale debt securities unrealized loss	61,000,000	$ 70,000,000
Private placement share redemption amount	$ 250,000
Private placement share redemption percentage	1.00%
Share redemption period	90 days