Income Taxes - Summary Gross Movement in Current Income Tax Assets / (Liabilities) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Current tax expense (income) and adjustments for current tax of prior periods [abstract] | |||
| Net current income tax assets / (liabilities) at the beginning | $ 702 | $ 374 | $ 468 |
| Income tax paid (net) | 662 | 1,114 | 1,088 |
| Current income tax expense | (1,435) | (1,015) | (1,153) |
| Interest receivable on income tax refund | 39 | 234 | |
| Income tax on other comprehensive income | 2 | (2) | |
| Income tax benefit arising on exercise of stock options | 4 | 6 | |
| Tax impact on buyback expenses | 1 | ||
| Additions through business combination | (2) | ||
| Translation differences | (3) | (5) | (32) |
| Net current income tax assets / (liabilities) at the end | $ (29) | $ 702 | $ 374 |