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Fair Values of Credit Substitutes by Type of Instrument (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019 INR (₨)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 INR (₨)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	₨ 2,617,505.3	$ 37,847.2	₨ 2,228,983.3
Fair Value	2,633,348.4	38,076.2	2,221,443.3
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	273,550.7	3,955.3	325,159.3
Fair Value	272,886.8	$ 3,945.8	324,031.5
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Debentures
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	247,869.1		290,893.5
Fair Value	247,152.5		289,782.9
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25,681.6		34,265.8
Fair Value	₨ 25,734.3		₨ 34,248.6

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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 http://asc.fasb.org/extlink&oid=118939692&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 http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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