Equity Investments - Schedule of Gains (Losses) on Non-Marketable Securities (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Investments, All Other Investments [Abstract] | |||
| Observable price adjustments on non-marketable equity securities (includes NAV) | $ 25 | $ (2) | $ 0 |
| Impairment of non-marketable equity securities | 0 | (4) | (3) |
| Total income (loss) from equity investments in non-marketable securities, net | $ 25 | $ (6) | $ (3) |