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Portfolio of Trading Securities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	₨ 167,433.1	$ 2,571.5	₨ 35,337.2
Gross Unrealized Gains	89.2	1.4	43.6
Gross Unrealized Losses	8.4	0.1	17.1
Fair Value	167,513.9	$ 2,572.8	35,363.7
Debt Securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	75,944.5
Gross Unrealized Gains	81.8
Gross Unrealized Losses	8.4
Fair Value	76,017.9
Debt Securities | Government of India securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	25,962.2		18,230.8
Gross Unrealized Gains	19.0		38.5
Gross Unrealized Losses	8.0		1.5
Fair Value	25,973.2		18,267.8
Debt Securities | Other corporate/financial institution securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	49,982.3		17,106.4
Gross Unrealized Gains	62.8		5.1
Gross Unrealized Losses	0.4		15.6
Fair Value	50,044.7		₨ 17,095.9
Other securities (including mutual fund units)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	91,488.6
Gross Unrealized Gains	7.4
Gross Unrealized Losses	0.0
Fair Value	₨ 91,496.0

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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 accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in trading securities impacting investments.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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

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