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Details of Guarantees and Documentary Credits Outstanding (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2017 INR (₨)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 INR (₨)
Guarantees and Documentary Credits Fair Value [Line Items]
Bank guarantees	₨ 729,008.0	$ 11,241.4	₨ 652,140.6
Estimated fair values of bank guarantees	(2,679.4)	(41.3)	(2,198.6)
Financial guarantees
Guarantees and Documentary Credits Fair Value [Line Items]
Bank guarantees	202,430.1	3,121.5	194,250.1
Performance guarantees
Guarantees and Documentary Credits Fair Value [Line Items]
Bank guarantees	166,964.2	2,574.6	140,364.7
Documentary credits
Guarantees and Documentary Credits Fair Value [Line Items]
Bank guarantees	359,613.7	5,545.3	317,525.8
Estimated fair values of documentary credits	(340.2)	(5.2)	(326.1)
Guarantees
Guarantees and Documentary Credits Fair Value [Line Items]
Estimated fair values of bank guarantees	₨ (2,339.2)	$ (36.1)	₨ (1,872.5)

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- Definition

Estimated fair value of documentary credits.

+ References

No definition available.

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- Definition

Indicates line item in statement of Guarantee and Documentary credits.

+ References

No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12201-110248

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