Cash and Cash Equivalents and Investments in Marketable Securities - Additional Information (Details) - USD ($)	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Marketable Securities [Abstract]
Fair value option elected	$ 778,000,000	$ 770,000,000
Available-for-sale debt securities unrealized loss	70,000,000	57,000,000
Private placement share redemption amount	$ 250,000
Private placement share redemption percentage	1.00%
Share redemption period	90 days
Non-cash investing activities related to in-kind transactions	$ 0	$ 0	$ 1,100,000,000