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Portfolio of Trading Securities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2015 INR (₨)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 INR (₨)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	₨ 61,239.5	$ 982.8	₨ 65,308.4
Gross Unrealized Gains	53.5	0.9	15.9
Gross Unrealized Losses	0.2	0.0	246.4
Fair Value	61,292.8	$ 983.7	65,077.9
Debt Securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	61,239.5		65,283.2
Gross Unrealized Gains	53.5		15.2
Gross Unrealized Losses	0.2		246.3
Fair Value	61,292.8		65,052.1
Debt Securities | Government of India securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	60,239.5		56,409.0
Gross Unrealized Gains	53.5		3.5
Gross Unrealized Losses	0.2		191.1
Fair Value	60,292.8		56,221.4
Debt Securities | Other corporate/financial institution securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	1,000.0		8,874.2
Gross Unrealized Gains	0.0		11.7
Gross Unrealized Losses	0.0		55.2
Fair Value	1,000.0		8,830.7
Equity securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	0.0		25.2
Gross Unrealized Gains	0.0		0.7
Gross Unrealized Losses	0.0		0.1
Fair Value	₨ 0.0		₨ 25.8

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- Definition

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in trading securities impacting investments.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 45



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.4)



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 45



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Trading Securities



-URI http://asc.fasb.org/extlink&oid=6526789

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