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Fair Values of Credit Substitutes by Type of Instrument (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | ₨ 4,241,981.6 | $ 57,998.1 | ₨ 3,340,732.3
Fair Value | 4,275,449.9 | 58,455.7 | 3,406,289.2
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 534,227.1 | 7,304.2 | 360,741.5
Fair Value | 547,276.9 | $ 7,482.6 | 362,373.7
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Debentures |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 524,448.4 |  | 236,717.2
Fair Value | 537,472.8 |  | 237,980.3
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Commercial paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 9,778.7 |  | 124,024.3
Fair Value | ₨ 9,804.1 |  | ₨ 124,393.4

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