Equity Investments - Schedule of Equity Investments (Details) - USD ($) $ in Millions	Dec. 31, 2025	Mar. 31, 2025
Investments, All Other Investments [Abstract]
Equity method investments under fair value option	$ 157	$ 300
Equity investments in publicly listed companies	70	98
Equity method investments under equity method	18	16
Non-marketable equity securities	124	151
Total equity investments	$ 369	$ 565

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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