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Portfolio of Trading Securities (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2019 INR (₨)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 INR (₨)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	₨ 265,011.1	$ 3,831.9	₨ 167,433.1
Gross Unrealized Gains	506.2	7.3	89.2
Gross Unrealized Losses	1.2	0.0	8.4
Fair Value	265,516.1	$ 3,839.2	167,513.9
Debt Securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	168,075.5		75,944.5
Gross Unrealized Gains	179.0		81.8
Gross Unrealized Losses	1.2		8.4
Fair Value	168,253.3		76,017.9
Debt Securities | Government of India securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	134,084.9		25,962.2
Gross Unrealized Gains	163.2		19.0
Gross Unrealized Losses	0.1		8.0
Fair Value	134,248.0		25,973.2
Debt Securities | Other corporate/financial institution securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	33,990.6		49,982.3
Gross Unrealized Gains	15.8		62.8
Gross Unrealized Losses	1.1		0.4
Fair Value	34,005.3		50,044.7
Other securities (including mutual fund units)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	96,935.6		91,488.6
Gross Unrealized Gains	327.2		7.4
Gross Unrealized Losses	0.0		0.0
Fair Value	₨ 97,262.8		₨ 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.

+ References

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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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