The profit or loss for the period under Indian GAAP, net of income taxes.

No definition available.

Name:	hdb_IndianGaapProfitLoss
Namespace Prefix:	hdb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of after tax Indian GAAP profit required transfer to a non-distributable statutory reserve for payment of dividends without prior RBI approval.

+ References

No definition available.

+ Details

Name:	hdb_PercentageOfIncomeTransferredToRetainedEarningsAppropriatedForLegalReserve
Namespace Prefix:	hdb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum amount of Dividend payout as a percentage of net income under Indian GAAP.

+ References

No definition available.

+ Details

Name:	hdb_StatutoryAccountingPracticesNetIncomeAvailableForDividends
Namespace Prefix:	hdb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

+ Details

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

+ Details

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Disclosure of statutory restrictions on the payment of dividends as prescribed by the National Association of Insurance Commissioners or state regulatory authorities, amounts not available for future dividend payments, and amount of dividends paid.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

+ Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=hdb_SpecialInterimDividendMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=hdb_IndianGenerallyAcceptedAccountingPrinciplesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Earnings Per Equity Share - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions				12 Months Ended
	Jun. 18, 2021 ₨ / shares	Apr. 22, 2021	Aug. 02, 2019 ₨ / shares	Mar. 31, 2021 $ / shares ₨ / shares shares	Mar. 31, 2021 INR (₨) ₨ / shares shares	Mar. 31, 2020 ₨ / shares shares	Mar. 31, 2019 ₨ / shares	Mar. 31, 2021 $ / shares shares	Sep. 20, 2019 ₨ / shares shares	Sep. 19, 2019 ₨ / shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity shares, issued \| shares				5,512,776,482	5,512,776,482	5,483,286,460		5,512,776,482	5,470,763,894
Equity shares, par value				₨ 1.0	₨ 1.0	₨ 1.0			₨ 1.0	₨ 2.0
Required transfer of after tax Indian GAAP profit to a non-distributable statutory reserve in order to pay dividends without prior RBI approval					25.00%
Net income calculated under Indian GAAP \| ₨					₨ 311,165.3
Dividends declared \| (per share)						2.5	₨ 7.5	$ 0
Dividends declared per equity share \| (per share)				₨ 0.09	₨ 6.5	₨ 2.5	₨ 7.5
Subsequent Event
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dividends declared per equity share	₨ 6.5
Special Interim Dividend
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Dividends, Per Share, Cash Paid			₨ 2.5
Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity shares, par value									₨ 2.0
Employees Stock Option Scheme
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential equity shares excluded from the calculation of diluted earnings per share, average outstanding balance \| shares					73,917,840	24,224,032
Indian GAAP [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dividend payout, description of restrictions					As per the RBI guidelines, the dividend payout (excluding dividend tax) for March 31, 2021 cannot exceed 35% of net income of Rs. 311,165.3 million as calculated under Indian GAAP
Indian GAAP [Member] \| Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dividend payout, maximum pay out as a percentage of net income calculated under Indian GAAP					35.00%
Indian GAAP [Member] \| Maximum \| Subsequent Event
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dividend payout, maximum pay out as a percentage of net income calculated under Indian GAAP		50.00%