XML 82 R72.htm IDEA: XBRL DOCUMENT
v3.21.2

Investments, Available for Sale Debt Securities -Summary of Allowances for Available for sale debt Securities (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning of the period | ₨ 0.0 | $ 0.0
Write- offs | 0.0 | 0.0
Net allowance for credit losses | 2,915.1 | 39.9
Allowance for credit losses, end of the period | 2,915.1 | $ 39.9
Debt securities, other than asset and mortgage0.0backed securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning of the period | 0.0 |
Write- offs | 0.0 |
Net allowance for credit losses | 0.0 |
Allowance for credit losses, end of the period | 0.0 |
Mortgage-backed securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning of the period | 0.0 |
Write- offs | 0.0 |
Net allowance for credit losses | 0.0 |
Allowance for credit losses, end of the period | 0.0 |
Asset-backed securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning of the period | 0.0 |
Write- offs | 0.0 |
Net allowance for credit losses | 0.0 |
Allowance for credit losses, end of the period | 0.0 |
Other securities (including mutual fund units) |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning of the period | 0.0 |
Write- offs | 0.0 |
Net allowance for credit losses | 0.0 |
Allowance for credit losses, end of the period | 0.0 |
Government of India securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning of the period | 0.0 |
Write- offs | 0.0 |
Net allowance for credit losses | 0.0 |
Allowance for credit losses, end of the period | 0.0 |
State government securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning of the period | 0.0 |
Write- offs | 0.0 |
Net allowance for credit losses | 0.0 |
Allowance for credit losses, end of the period | 0.0 |
Credit Substitutes |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning of the period | 0.0 |
Write- offs | 0.0 |
Net allowance for credit losses | 2,915.1 |
Allowance for credit losses, end of the period | 2,915.1 |
Other corporate/financial institution bonds |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning of the period | 0.0 |
Write- offs | 0.0 |
Net allowance for credit losses | 0.0 |
Allowance for credit losses, end of the period | 0.0 |
Government securities outside India |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses, beginning of the period | 0.0 |
Write- offs | 0.0 |
Net allowance for credit losses | 0.0 |
Allowance for credit losses, end of the period | ₨ 0.0 |

X
- Definition Debt Securities Available For Sale Allowance For Credit Loss Net + References No definition available. + Details
Name: | hdb_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNet
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of allowance for credit 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of writeoff of allowance for credit 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=hdb_DebtSecuritiesOtherThanAssetAndMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=hdb_OtherSecuritiesIncludingMutualFundUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=hdb_GovernmentOfIndiaSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=hdb_SecuritiesIssuedByStateGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=hdb_CreditSubstitutesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=hdb_OtherCorporateFinancialInstitutionBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=hdb_GovernmentSecuritiesOutsideIndiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |