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Investments, Available for Sale Debt Securities - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨) | Mar. 31, 2020 INR (₨) | Mar. 31, 2022 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Investments available for sale, at fair value, restricted investments | ₨ 1,648,213.8 |  | ₨ 1,694,645.4 |  | $ 21,724.2
Debt Securities, Available-for-sale, Unrealized Loss | 48,815.6 |  |  |  |
Net allowance for credit losses | (2,915.1) | $ (38.4) | 2,915.1 |  |
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 | 3,622,643.8 |  | 3,524,275.8 |  | 47,748.0
Investments available for sale, at fair value, restricted investments | 1,648,213.8 |  | 1,694,645.4 |  | $ 21,724.2
Available-for-Sale Debt Securities | Accounting ​Guidance​ [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Net allowance for credit losses | 0.0 |  | ₨ 2,915.1 | ₨ 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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- Definition Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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