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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in equity securities	$ 175		$ 175		$ 240
Gains (losses) associated with equity investments	(15)	$ 0	95	$ 0
Gain related to share price increase of equity securities			100
Proceeds from sale of equity securities			92
Fair value, inputs, level 1 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds at carrying value	$ 549		$ 549		$ 705