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Comparison of Fair Values and Carrying Values of Financial Instruments (Detail) ₨ in Millions, $ in Millions		Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 INR (₨)	Mar. 31, 2015 INR (₨)
Financial Assets:
Investments available for sale	[1]	₨ 2,222,002.6	$ 34,126.9	₨ 2,110,677.4
Cash and cash equivalents		574,151.0	8,818.2	430,708.6
Term placements		139,818.8	2,147.4	130,997.9
Investments held for trading		167,513.9	2,572.8	35,363.7
Securities purchased under agreements to resell		650,018.6	9,983.4	50,000.0
Loans		7,296,375.8	112,062.3	5,961,739.0
Accrued interest receivable		77,894.7	1,196.4	67,356.6
Other assets		106,771.8	1,639.9	189,085.7
Financial Assets:
Cash and cash equivalents		574,151.0	8,818.2	430,708.6	$ 6,615.1	₨ 377,671.7	₨ 341,124.3
Term placements		139,875.9	2,148.3	131,069.5
Investments held for trading		167,513.9	2,572.8	35,363.7
Investments available for sale	[1]	2,222,002.6	34,126.9	2,110,677.4
Securities purchased under agreements to resell		650,018.6	9,983.4	50,000.0
Loans		7,263,671.8	111,560.0	5,910,412.8
Accrued interest receivable		77,894.7	1,196.4	67,356.6
Other assets		108,370.1	1,664.4	190,567.3
Financial Liabilities :
Interest-bearing deposits		6,693,649.3	102,805.2	5,277,644.0
Non-interest-bearingdeposits		1,190,102.2	18,278.3	1,153,678.9
Securities sold under repurchase agreements		138,000.0	2,119.5	0.0
Short-term borrowings		779,201.7	11,967.5	322,265.6
Accrued interest payable		65,514.4	1,006.2	44,487.6
Long-term debt		932,906.3	14,328.2	730,920.7
Accrued expenses and other liabilities		301,871.0	4,636.3	449,454.6
Financial Liabilities :
Securities sold under repurchase agreements		138,000.0	2,119.5	0.0
Short-term borrowings		779,418.7	11,970.8	321,708.0
Accrued interest payable		65,514.4	1,006.2	44,487.6
Long-term debt		943,813.5	14,495.7	758,454.8
Accrued expenses and other liabilities		301,871.0	4,636.3	449,454.6
Estimated Fair Value
Financial Assets:
Investments available for sale	[1]	2,222,002.6	34,126.9	2,110,677.4
Financial Assets:
Investments available for sale	[1]	2,222,002.6	34,126.9	2,110,677.4
Interest Bearing Deposits Liabilities
Financial Liabilities :
Interest-bearing deposits		6,716,360.3	103,154.1	5,316,226.4
Non-interest-bearing deposits
Financial Liabilities :
Interest-bearing deposits		1,190,102.2	$ 18,278.3	1,153,678.9
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash and cash equivalents		574,151.0		430,708.6
Term placements		0.0		0.0
Investments held for trading		3,652.4		4.8
Securities purchased under agreements to resell		0.0		0.0
Loans		0.0		0.0
Accrued interest receivable		0.0		0.0
Other assets		0.0		0.0
Financial Assets:
Investments held for trading		3,652.4		4.8
Financial Liabilities :
Securities sold under repurchase agreements		0.0		0.0
Short-term borrowings		0.0		0.0
Accrued interest payable		0.0		0.0
Long-term debt		0.0		0.0
Accrued expenses and other liabilities		0.0		0.0
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Estimated Fair Value
Financial Assets:
Investments available for sale	[1]	4,569.0		8,198.7
Financial Assets:
Investments available for sale	[1]	4,569.0		8,198.7
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest Bearing Deposits Liabilities
Financial Liabilities :
Interest-bearing deposits		0.0		0.0
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Non-interest-bearing deposits
Financial Liabilities :
Interest-bearing deposits		0.0		0.0
Fair Value Measurements Using Significant other observable inputs (Level 2)
Financial Assets:
Cash and cash equivalents		0.0		0.0
Term placements		139,818.8		130,997.9
Investments held for trading		163,861.5		35,358.9
Securities purchased under agreements to resell		650,018.6		50,000.0
Loans		2,078,100.0		1,791,981.2
Accrued interest receivable		77,894.7		67,356.6
Other assets		106,771.8		189,085.7
Financial Assets:
Investments held for trading		163,861.5		35,358.9
Financial Liabilities :
Securities sold under repurchase agreements		138,000.0		0.0
Short-term borrowings		779,418.7		321,708.0
Accrued interest payable		65,514.4		44,487.6
Long-term debt		943,813.5		758,454.8
Accrued expenses and other liabilities		301,871.0		449,454.6
Fair Value Measurements Using Significant other observable inputs (Level 2) | Estimated Fair Value
Financial Assets:
Investments available for sale	[1]	2,198,899.0		2,080,579.6
Financial Assets:
Investments available for sale	[1]	2,198,899.0		2,080,579.6
Fair Value Measurements Using Significant other observable inputs (Level 2) | Interest Bearing Deposits Liabilities
Financial Liabilities :
Interest-bearing deposits		6,716,360.3		5,316,226.4
Fair Value Measurements Using Significant other observable inputs (Level 2) | Non-interest-bearing deposits
Financial Liabilities :
Interest-bearing deposits		1,190,102.2		1,153,678.9
Fair Value Measurements Using Significant unobservable inputs (Level 3)
Financial Assets:
Cash and cash equivalents		0.0		0.0
Term placements		0.0		0.0
Investments held for trading		0.0		0.0
Securities purchased under agreements to resell		0.0		0.0
Loans		5,218,275.8		4,169,757.8
Accrued interest receivable		0.0		0.0
Other assets		0.0		0.0
Financial Assets:
Investments held for trading		0.0		0.0
Financial Liabilities :
Securities sold under repurchase agreements		0.0		0.0
Short-term borrowings		0.0		0.0
Accrued interest payable		0.0		0.0
Long-term debt		0.0		0.0
Accrued expenses and other liabilities		0.0		0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Estimated Fair Value
Financial Assets:
Investments available for sale	[1]	18,534.6		21,899.1
Financial Assets:
Investments available for sale	[1]	18,534.6		21,899.1
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Interest Bearing Deposits Liabilities
Financial Liabilities :
Interest-bearing deposits		0.0		0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Non-interest-bearing deposits
Financial Liabilities :
Interest-bearing deposits		₨ 0.0		₨ 0.0
[1] excluding investments carried at cost Rs. 708.4 million (US$10.9 million) (as at March 31, 2017, Rs. 708.2 million)

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_ShorttermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

X

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=hdb_InterestBearingDepositsLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=hdb_NonInterestBearingDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: