XML 84 R74.htm IDEA: XBRL DOCUMENT v3.10.0.1

Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)
Gain (Loss) on Securities [Line Items]
Less Than 12 Months Fair Value	₨ 748,590.4	$ 11,497.3	₨ 426,395.0
Less Than 12 Months Unrealized Losses	10,856.9	166.8	3,914.6
12 Months or Greater Fair Value	426,172.1	6,545.4	4,929.6
12 Months or Greater Unrealized Losses	8,764.1	134.6	95.4
Fair Value	1,174,762.5	18,042.7	431,324.6
Unrealized Losses	19,621.0	$ 301.4	4,010.0
Debt securities, other than asset and mortgage-backed securities
Gain (Loss) on Securities [Line Items]
Less Than 12 Months Fair Value	740,181.9		417,114.7
Less Than 12 Months Unrealized Losses	10,643.3		3,561.2
12 Months or Greater Fair Value	420,466.0		0.0
12 Months or Greater Unrealized Losses	8,618.5		0.0
Fair Value	1,160,647.9		417,114.7
Unrealized Losses	19,261.8		3,561.2
Debt securities, other than asset and mortgage-backed securities | Government of India securities
Gain (Loss) on Securities [Line Items]
Less Than 12 Months Fair Value	540,941.5		234,685.5
Less Than 12 Months Unrealized Losses	8,852.9		2,811.3
12 Months or Greater Fair Value	342,621.5		0.0
12 Months or Greater Unrealized Losses	7,991.0		0.0
Fair Value	883,563.0		234,685.5
Unrealized Losses	16,843.9		2,811.3
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes
Gain (Loss) on Securities [Line Items]
Less Than 12 Months Fair Value	159,026.1		178,908.2
Less Than 12 Months Unrealized Losses	1,002.8		737.8
12 Months or Greater Fair Value	73,734.9		0.0
12 Months or Greater Unrealized Losses	620.3		0.0
Fair Value	232,761.0		178,908.2
Unrealized Losses	1,623.1		737.8
Debt securities, other than asset and mortgage-backed securities | Other corporate/financial institution bonds
Gain (Loss) on Securities [Line Items]
Less Than 12 Months Fair Value	4,057.2		3,521.0
Less Than 12 Months Unrealized Losses	51.8		12.1
12 Months or Greater Fair Value	4,109.6		0.0
12 Months or Greater Unrealized Losses	7.2		0.0
Fair Value	8,166.8		3,521.0
Unrealized Losses	59.0		12.1
Debt securities, other than asset and mortgage-backed securities | State government securities
Gain (Loss) on Securities [Line Items]
Less Than 12 Months Fair Value	31,940.1
Less Than 12 Months Unrealized Losses	729.0
Fair Value	31,940.1
Unrealized Losses	729.0		0.0
Debt securities, other than asset and mortgage-backed securities | Government securities outside India
Gain (Loss) on Securities [Line Items]
Less Than 12 Months Fair Value	4,217.0
Less Than 12 Months Unrealized Losses	6.8
Fair Value	4,217.0
Unrealized Losses	6.8
Mortgage-backed securities
Gain (Loss) on Securities [Line Items]
Less Than 12 Months Fair Value	57.0		0.0
Less Than 12 Months Unrealized Losses	0.1		0.0
12 Months or Greater Fair Value			0.0
12 Months or Greater Unrealized Losses			0.0
Fair Value	57.0		0.0
Unrealized Losses	0.1		0.0
Asset-backed securities
Gain (Loss) on Securities [Line Items]
Less Than 12 Months Fair Value	8,331.9		9,149.5
Less Than 12 Months Unrealized Losses	213.1		257.9
12 Months or Greater Fair Value	5,706.1		4,929.6
12 Months or Greater Unrealized Losses	145.6		95.4
Fair Value	14,038.0		14,079.1
Unrealized Losses	358.7		353.3
Other securities (including mutual fund units)
Gain (Loss) on Securities [Line Items]
Less Than 12 Months Fair Value	19.6		130.8
Less Than 12 Months Unrealized Losses	0.4		95.5
12 Months or Greater Fair Value			0.0
12 Months or Greater Unrealized Losses			0.0
Fair Value	19.6		130.8
Unrealized Losses	₨ 0.4		₨ 95.5

X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

No definition available.

+ Details

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

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_InvestmentTypeAxis=hdb_GovernmentOfIndiaSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=hdb_CreditSubstitutesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=hdb_OtherCorporateFinancialInstitutionBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=hdb_SecuritiesIssuedByStateGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=hdb_GovernmentSecuritiesOutsideIndiaMember
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:

X

- Details

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