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Fair Value of Credit Substitutes (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2022 INR (₨)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 INR (₨)
Schedule of Available-for-sale Securities [Line Items]
Pass	₨ 583,020.2	$ 7,684.5	₨ 547,276.9
Non-performing—gross balance	0.0	0.0	0.0
Less: Non-performing losses	0.0	0.0	0.0
Non-performing credit substitutes, net	0.0	0.0	0.0
Total credit substitutes, net	₨ 583,020.2	$ 7,684.5	₨ 547,276.9

X

- Definition

This item represents the aggregate fair value of investments in Available for Sale Credit Substitute.

+ References

No definition available.

+ Details

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

X

- Definition

Credit Substitutes Performing in which payments are received or paid on a timely basis in accordance with the terms of the contract.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of credit substitute net of expense on account of non-performing credit substitute.

+ References

No definition available.

+ Details

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

X

- Definition

Gross amount of non-performing credit substitute.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of expense related to Credit substitutes based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

No definition available.

+ Details

Name:	hdb_NonPerformingLosses
Namespace Prefix:	hdb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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