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v3.25.2

Investments, AFS debt securities - Investments, Available for Sale Debt Securities - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
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Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨) | Mar. 31, 2025 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investments available for sale, at fair value, restricted investments | ₨ 3,936,248.0 |  | ₨ 1,792,147.6 | $ 46,075.7
Debt Securities, Available-for-sale, Unrealized Loss | 8,575.6 |  |  |
Net allowance for credit losses | 0.0 | $ 0.0 | (70.9) |
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 | 7,606,321.8 |  | 6,340,926.3 | 89,035.7
Investments available for sale, at fair value, restricted investments | 3,936,248.0 |  | 1,792,147.6 | $ 46,075.7
Net allowance for credit losses | 0.0 |  | ₨ 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] |  |  |  |
Average credit rating | AAA | AAA |  |
Asset-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Average credit rating | AAA | AAA |  |

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