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Investments Measured at Fair Value on Recurring Basis (Detail) ₨ in Millions, $ in Millions		Mar. 31, 2022 INR (₨)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 INR (₨)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities		₨ 53,199.5	$ 701.2	₨ 99,620.2
Securities Available-for-Sale		4,388,563.1	57,843.2	4,275,449.9
Total | $			58,703.4
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities		53,199.5		99,620.2
Securities Available-for-Sale		4,388,563.1		4,275,449.9
Equity securities	[1]	12,070.8		19,577.8
Total		4,453,833.4		4,394,647.9
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		304.1		0.0
Securities Available-for-Sale		174,680.3		176,015.8
Equity securities	[1]	3,889.8		11,869.8
Total		178,874.2	2,357.6	187,885.6
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		52,895.4		99,620.2
Securities Available-for-Sale		4,069,988.1		3,938,270.2
Equity securities	[1]	8,181.0		7,708.0
Total		4,131,064.5	54,449.2	4,045,598.4
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		143,894.7		161,163.9
Equity securities	[1]	0.0		0.0
Total		₨ 143,894.7	$ 1,896.6	₨ 161,163.9
[1] Equity securities classified within other assets.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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), classified as current.

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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.

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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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