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Fair Value of Credit Substitutes (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Pass | ₨ 583,020.2 | $ 7,684.5 | ₨ 547,276.9
Non-performing—gross balance | 0.0 | 0.0 | 0.0
Less: Non-performing losses | 0.0 | 0.0 | 0.0
Non-performing credit substitutes, net | 0.0 | 0.0 | 0.0
Total credit substitutes, net | ₨ 583,020.2 | $ 7,684.5 | ₨ 547,276.9

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- Definition This item represents the aggregate fair value of investments in Available for Sale Credit Substitute. + References No definition available. + Details
Name: | hdb_AvailableforsaleCreditSubstituteSecurities
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Credit Substitutes Performing in which payments are received or paid on a timely basis in accordance with the terms of the contract. + References No definition available. + Details
Name: | hdb_CreditSubstitutesPerforming
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of credit substitute net of expense on account of non-performing credit substitute. + References No definition available. + Details
Name: | hdb_NonPerformingCreditSubstitutesNet
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Gross amount of non-performing credit substitute. + References No definition available. + Details
Name: | hdb_NonPerformingGrossBalance
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of expense related to Credit substitutes based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References No definition available. + Details
Name: | hdb_NonPerformingLosses
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration