Employee Benefits - Summary of Net Gratuity Cost Recognized in Statement of Comprehensive Income Under Employee Benefit Expense (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Gratuity | |||
| Disclosure Of Defined Benefit Plans [Line Items] | |||
| Service cost | $ 49 | $ 40 | $ 37 |
| Net interest on the net defined benefit liability / (asset) | (1) | (1) | |
| Past service cost - plan amendments | 136 | ||
| Net cost | 184 | 39 | 37 |
| Pension | |||
| Disclosure Of Defined Benefit Plans [Line Items] | |||
| Service cost | 6 | 6 | 6 |
| Past service cost - plan amendments | (4) | ||
| Net cost | $ 6 | $ 6 | $ 2 |