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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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