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Long-Term Debt - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 INR (₨) | Mar. 31, 2019 INR (₨) | Mar. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |
Subordinated debt, debt raised during the year |  | ₨ 5,435.0 | ₨ 6,000.0 |
Other long term debt, debt raised during the year |  | 264,669.7 | 311,093.6 |
Perpetual debt, debt raised during the year |  | 2,000.0 | 3,000.0 |
Other long-term debt | [1] | 808,222.0 | 833,265.2 | $ 10,720.5
Foreign currency borrowings |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other long-term debt |  | 59,392.3 | 36,305.9 |
Functional currency borrowings |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other long-term debt |  | ₨ 748,829.7 | ₨ 796,959.3 |
[1] | Includes securities sold under repurchase agreements amounting to Rs. 17,260.0 million (USD 228.9 million) for the fiscal period ended March 31, 2020 with stated interest rate of 5.15% per annum, under RBI long-term repo operation with a three-year maturity period.

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