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Impaired Credit Substitutes (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2020 INR (₨)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 INR (₨)	Mar. 31, 2020 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Gross impaired credit substitutes	₨ 0		₨ 0	$ 0
Debt securities, other than asset and mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Average impaired credit substitutes	0	$ 0	0
Interest income recognized on impaired credit substitutes	0	$ 0	0
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes
Schedule of Available-for-sale Securities [Line Items]
Gross impaired credit substitutes	0		0	0
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes by Industry
Schedule of Available-for-sale Securities [Line Items]
Gross impaired credit substitutes	₨ 0		₨ 0	$ 0

X

- Definition

Average Gross amount during the period of credit substitute securities where cost exceeds fair value is not an other than temporary impairment (OTTI) and which is determined to be temporarily impaired.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Credit Substitutes Impaired Gross Amount where fair value is below cost and the decline is other than temporary.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of interest income recognized on credit substitute securities classified as impaired during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	hdb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: