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Investments Measured at Fair Value on Recurring Basis (Detail) ₨ in Millions, $ in Millions		Mar. 31, 2021 INR (₨)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 INR (₨)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities		₨ 99,620.2	$ 1,362.0	₨ 304,962.9
Total | $			60,085.4
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities		99,620.2		304,962.9
Securities Available-for-Sale		4,275,449.9		3,406,289.2
Equity securities	[1]	19,577.8		10,937.5
Total		4,394,647.9		3,722,189.6
Fair Value, Measurements, Recurring | Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities		0.0		6,291.0
Securities Available-for-Sale		176,015.8		371,450.5
Equity securities	[1]	11,869.8		2,282.4
Total		187,885.6	2,568.8	380,023.9
Fair Value, Measurements, Recurring | Fair Value Measurements Using Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities		99,620.2		298,671.9
Securities Available-for-Sale		3,938,270.2		2,907,384.4
Equity securities	[1]	7,708.0		8,655.1
Total		4,045,598.4	55,313.1	3,214,711.4
Fair Value, Measurements, Recurring | Fair Value Measurements Using Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities		0.0		0.0
Securities Available-for-Sale		161,163.9		127,454.3
Equity securities	[1]	0.0		0.0
Total		₨ 161,163.9	$ 2,203.5	₨ 127,454.3
[1] Equity securities classified within other assets.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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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).

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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=120398452&loc=d3e534808-122878

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