XML 74 R64.htm IDEA: XBRL DOCUMENT
v3.21.2

Summary of Significant Accounting Policies - Additional Information (Detail) ₨ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2020 INR (₨) | Mar. 31, 2021 Segment | Mar. 31, 2020
Significant Accounting Policies [Line Items] |  |  |
Reportable segments | Segment |  | 3 |
Financial statements translation rate, Indian rupees (Rs.) equivalence of U.S. $1 |  | 73.14 |
Impact of ASC 326 Adoption |  |  |
Significant Accounting Policies [Line Items] |  |  |
Increase decrease in retained earnings | ₨ 62,480.4 |  |
Increase decrease in deferred tax asset | 21,016.0 |  |
Loans and leases receivable, gross | ₨ 83,496.4 |  |
Retail Loans | Personal Loans, Credit Card Receivables, Auto Loans, Commercial Vehicle and Construction Equipment Finance |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period |  |  | 150 days
Retail Loans | Housing loans |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period |  |  | 720 days
Retail Loans | Retail Business Banking |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period |  |  | customer by customer basis
Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Bank voting rights |  | 20.00% |
Minimum | Retail Loans |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period |  |  | 150 days
Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Bank voting rights |  | 50.00% |
Maximum | Retail Loans |  |  |
Significant Accounting Policies [Line Items] |  |  |
Loans charge off period |  |  | 1083 days
HDFC Group [Member] | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of voting rights in which bank consolidates subsidiary |  | 50.00% |

X
- Definition Increase Decrease In Deferred Tax Asset + References No definition available. + Details
Name: | hdb_IncreaseDecreaseInDeferredTaxAsset
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase Decrease In Retained Earnings. + References No definition available. + Details
Name: | hdb_IncreaseDecreaseInRetainedEarnings
Namespace Prefix: | hdb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loans Charge Off Description + References No definition available. + Details
Name: | hdb_LoansChargeOffDescription
Namespace Prefix: | hdb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | hdb_SignificantAccountingPoliciesLineItems
Namespace Prefix: | hdb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Threshold period for when financing receivable is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447 + Details
Name: | us-gaap_FinancingReceivableThresholdPeriodPastDueWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901 + Details
Name: | us-gaap_ForeignCurrencyExchangeRateTranslation1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | hdb_ImpactOfAsc326AdoptionsAxis=hdb_ImpactOfAsc326AdoptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hdb_PersonalLoansCreditCardFinancingReceivablesAutoLoansCommercialVehicleAndConstructionEquipmentFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hdb_RetailBusinessBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=hdb_HousingDevelopmentFinanceCorporationGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |