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Stockholders' Equity - Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in shares)	0	38,444,830	24,436,738
Average price per share (in dollars per share)		$ 22.98	$ 27.78
Share repurchase amount		$ 883	$ 679
Open market purchases
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in shares)		38,444,830	24,436,738
Average price per share (in dollars per share)		$ 22.98	$ 27.78
Share repurchase amount		$ 883	$ 679

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