Income Taxes - Summary of Income Tax Assets and Income Tax Liabilities (Details) - USD ($) $ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2022 |
|---|---|---|---|---|
| Major components of tax expense (income) [abstract] | ||||
| Income tax assets | $ 538 | $ 1,132 | ||
| Current income tax liabilities | (567) | (430) | ||
| Net current income tax assets / (liabilities) at the end | $ (29) | $ 702 | $ 374 | $ 468 |