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Fair Value of Credit Substitutes by Type of Instrument (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2023 INR (₨)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 INR (₨)
Schedule of Available-for-sale Securities [Line Items]
Fair Value	₨ 4,878,844.0	$ 59,360.6	₨ 4,388,563.1
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	511,161.4	6,219.3	578,922.3
Fair Value	503,187.8	$ 6,122.3	583,020.2
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Debentures
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	510,880.4		577,377.0
Fair Value	503,187.6		581,551.5
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Preference shares
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	281.0		77.1
Fair Value	0.2		0.5
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0.0		1,468.2
Fair Value	₨ 0.0		₨ 1,468.2

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- Definition

Amortized cost of 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 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount of 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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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