Details of PCD of EHDFC (Detail) - Jul. 01, 2023 - eHDFC [Member] ₨ in Millions, $ in Millions	INR (₨)	USD ($)
Disclosure Of Financing Receivable Purchased With Credit Deterioration [Line Items]
Par value of PCD loans at acquisition	₨ 116,646.3	$ 1,399.6
Allowance for credit losses on PCD loans at acquisition	39,415.2	472.9
Fair value of receivables at acquisition	77,200.4	926.3
Non-credit discount/(premium) on PCD loans at acquisition	30.7	$ 0.4
Wholesale
Disclosure Of Financing Receivable Purchased With Credit Deterioration [Line Items]
Par value of PCD loans at acquisition	72,684.7
Allowance for credit losses on PCD loans at acquisition	36,487.3
Fair value of receivables at acquisition	36,197.4
Non-credit discount/(premium) on PCD loans at acquisition	0.0
Retail
Disclosure Of Financing Receivable Purchased With Credit Deterioration [Line Items]
Par value of PCD loans at acquisition	43,961.6
Allowance for credit losses on PCD loans at acquisition	2,927.9
Fair value of receivables at acquisition	41,003.0
Non-credit discount/(premium) on PCD loans at acquisition	₨ 30.7

No definition available.

Name:	hdb_DisclosureOfFinancingReceivablePurchasedWithCreditDeteriorationLineItems
Namespace Prefix:	hdb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

+ Details

Name:	us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount at par value of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

+ Details

Name:	us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount at purchase price of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

+ Details

Name:	us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

+ Details

Name:	us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hdb_EhdfcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_RetailMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: