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Details of Guarantees and Documentary Credits Outstanding (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)
Guarantor Obligations [Line Items]
Bank guarantees	₨ 846,958.3	$ 13,008.1	₨ 729,008.0
Estimated fair values of bank guarantees	(3,231.5)	(49.6)	(2,679.4)
Financial guarantees
Guarantor Obligations [Line Items]
Bank guarantees	237,417.3	3,646.4	202,430.1
Performance guarantees
Guarantor Obligations [Line Items]
Bank guarantees	214,088.3	3,288.1	166,964.2
Documentary credits
Guarantor Obligations [Line Items]
Bank guarantees	395,452.7	6,073.6	359,613.7
Estimated fair values of documentary credits	(406.1)	(6.2)	(340.2)
Guarantees
Guarantor Obligations [Line Items]
Estimated fair values of bank guarantees	₨ (2,825.4)	$ (43.4)	₨ (2,339.2)

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- Definition

Estimated fair value of documentary credits.

+ References

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

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- 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

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- Definition

Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12201-110248

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