XML 80 R70.htm IDEA: XBRL DOCUMENT v3.21.2

Investments, Available for Sale Debt Securities - Additional Information (Detail) ₨ in Millions, $ in Millions		12 Months Ended
	Apr. 01, 2020 INR (₨)	Mar. 31, 2021 INR (₨)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 INR (₨)	Mar. 31, 2021 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available for sale investments, amount kept as margins for clearing, collateral borrowing and lending obligation (CBLO) and real time gross settlement (RTGS)		₨ 1,694,645.4		₨ 1,760,859.1	$ 23,169.9
Available-for-sale Securities, Gross Unrealized Loss		22,895.4
Net allowance for credit losses		2,915.1	$ 39.9
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		3,524,275.8		2,876,996.4	48,185.3
Available for sale investments, amount kept as margins for clearing, collateral borrowing and lending obligation (CBLO) and real time gross settlement (RTGS)		1,694,645.4		1,760,859.1	$ 23,169.9
Other than temporary impairment losses on available for sale securities				₨ 9,109.0
Available-for-Sale Debt Securities | Accounting Guidance
Schedule of Available-for-sale Securities [Line Items]
Net allowance for credit losses	₨ 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

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

Financial instrument credit rating.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of Securities eligible for placement towards the Bank's Statutory Liquidity Ratio Requirements.

+ References

No definition available.

+ Details

Name:	hdb_SecuritiesEligibleForStatutoryLiquidityRatioRequirements
Namespace Prefix:	hdb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ 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 http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

+ Details

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

X

- Definition

The carrying amount of securities categorized neither as held-to-maturity nor trading which serve as security for borrowings or other arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-03(f))
-URI http://asc.fasb.org/extlink&oid=120401367&loc=d3e600178-122990

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5086-111524

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12)
-URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611133-123010

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX210.4-08(b))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesRestricted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284422-111562

+ Details

Name:	us-gaap_ImpairmentOfInvestments
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_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AvailableforsaleSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProspectiveAdoptionOfNewAccountingPronouncementsAxis=us-gaap_PreviousAccountingGuidanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=hdb_HdbDebtSecuritiesOtherThanAssetAndMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=hdb_GovernmentIssuedOrBackedSecuritiesMember
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: