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Fair Values of Credit Substitutes (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)	Mar. 31, 2018 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Pass	₨ 324,031.5		₨ 419,540.6	$ 4,976.7
Impaired-gross balance	0.0		0.0	0.0
Less: amounts provided for other than temporary impairments	0.0	$ 0.0	0.0
Impaired credit substitutes, net	0.0		0.0	0.0
Total credit substitutes, net	₨ 324,031.5		₨ 419,540.6	$ 4,976.7

X

- Definition

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

+ References

No definition available.

+ Details

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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

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

Credit Substitutes, net, after provision made towards other than temporary impairments.

+ References

No definition available.

+ Details

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

X

- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale 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

No definition available.

+ Details

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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

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