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Investments, Available for Sale Debt Securities - Additional Information (Detail) ₨ in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 01, 2020 INR (₨) | Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨) | Mar. 31, 2021 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available for sale investments, amount kept as margins for clearing, collateral borrowing and lending obligation (CBLO) and real time gross settlement (RTGS) |  | ₨ 1,694,645.4 |  | ₨ 1,760,859.1 | $ 23,169.9
Available-for-sale Securities, Gross Unrealized Loss |  | 22,895.4 |  |  |
Net allowance for credit losses |  | 2,915.1 | $ 39.9 |  |
Available-for-Sale Debt Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available for sale investments, amount eligible towards the Bank's statutory liquidity reserve requirements |  | 3,524,275.8 |  | 2,876,996.4 | 48,185.3
Available for sale investments, amount kept as margins for clearing, collateral borrowing and lending obligation (CBLO) and real time gross settlement (RTGS) |  | 1,694,645.4 |  | 1,760,859.1 | $ 23,169.9
Other than temporary impairment losses on available for sale securities |  |  |  | ₨ 9,109.0 |
Available-for-Sale Debt Securities | Accounting Guidance |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Net allowance for credit losses | ₨ 0.0 |  |  |  |
HDB Debt Securities Other Than Asset And Mortgage Backed Securities | Government Issued or Backed Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Net allowance for credit losses |  | 0.0 |  |  |
Mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Net allowance for credit losses |  | ₨ 0.0 |  |  |
Average credit rating |  | AAA | AAA |  |
Asset-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Net allowance for credit losses |  | ₨ 0.0 |  |  |
Average credit rating |  | AAA | AAA |  |

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