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Investments, Available for Sale Debt Securities - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2022 INR (₨)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 INR (₨)	Mar. 31, 2020 INR (₨)	Mar. 31, 2022 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Investments available for sale, at fair value, restricted investments	₨ 1,648,213.8		₨ 1,694,645.4		$ 21,724.2
Debt Securities, Available-for-sale, Unrealized Loss	48,815.6
Net allowance for credit losses	(2,915.1)	$ (38.4)	2,915.1
Available-for-Sale Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale investments, amount eligible towards the Bank's statutory liquidity reserve requirements	3,622,643.8		3,524,275.8		47,748.0
Investments available for sale, at fair value, restricted investments	1,648,213.8		1,694,645.4		$ 21,724.2
Available-for-Sale Debt Securities | Accounting ​Guidance​ [Member]
Schedule of Available-for-sale Securities [Line Items]
Net allowance for credit losses	0.0		₨ 2,915.1	₨ 0.0
HDB Debt Securities Other Than Asset And Mortgage Backed Securities | Government Issued or Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Net allowance for credit losses	0.0
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Net allowance for credit losses	₨ 0.0
Average credit rating	AAA	AAA
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Net allowance for credit losses	₨ 0.0
Average credit rating	AAA	AAA

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Debt Securities Available For Sale Allowance For Credit Loss Net

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Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 210
-Section 45
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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