Investments in Marketable Securities - Additional Information (Details) - USD ($)	9 Months Ended	12 Months Ended
	Dec. 31, 2024	Mar. 31, 2024
Marketable Securities [Abstract]
Fair value option elected	$ 802,000,000	$ 778,000,000
Available-for-sale debt securities unrealized loss	$ 77,000,000	$ 70,000,000
Private placement share redemption percentage	1.00%
Private placement share redemption amount	$ 250,000
Share redemption period	90 days