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Portfolio of Trading Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨)
--- | --- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | ₨ 53,728.6 | $ 708.2 | ₨ 102,792.1
Gross Unrealized Gains | 187.8 | 2.5 | 240.0
Gross Unrealized Losses | 716.9 | 9.5 | 3,411.9
Fair Value | 53,199.5 | $ 701.2 | 99,620.2
Debt Securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 31,795.1 |  | 49,879.9
Gross Unrealized Gains | 59.6 |  | 129.1
Gross Unrealized Losses | 27.9 |  | 3.0
Fair Value | 31,826.8 |  | 50,006.0
Debt Securities | Government of India securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 28,159.7 |  | 15,076.0
Gross Unrealized Gains | 57.7 |  | 85.8
Gross Unrealized Losses | 21.9 |  | 2.6
Fair Value | 28,195.5 |  | 15,159.2
Debt Securities | Other corporate/financial institution securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 3,635.4 |  | 34,803.9
Gross Unrealized Gains | 1.9 |  | 43.3
Gross Unrealized Losses | 6.0 |  | 0.4
Fair Value | 3,631.3 |  | 34,846.8
Other securities (including mutual fund units) |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 21,933.5 |  | 52,912.2
Gross Unrealized Gains | 128.2 |  | 110.9
Gross Unrealized Losses | 689.0 |  | 3,408.9
Fair Value | ₨ 21,372.7 |  | ₨ 49,614.2

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