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Fair Value of Credit Substitutes by Type of Instrument (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | ₨ 4,416,934.2 | $ 58,217.1 | ₨ 4,241,981.6
Fair Value | 4,388,563.1 | 57,843.2 | 4,275,449.9
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 578,922.3 | 7,630.5 | 534,227.1
Fair Value | 583,020.2 | $ 7,684.5 | 547,276.9
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Debentures |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 577,377.0 |  | 524,448.4
Fair Value | 581,551.5 |  | 537,472.8
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Preference shares |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 77.1 |  |
Fair Value | 0.5 |  |
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Commercial paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,468.2 |  | 9,778.7
Fair Value | ₨ 1,468.2 |  | ₨ 9,804.1

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