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Fair Values of Credit Substitutes by Type of Instrument (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | ₨ 3,340,732.3 | $ 44,312.6 | ₨ 2,617,505.3
Fair Value | 3,406,289.2 | 45,182.2 | 2,633,348.4
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 360,741.5 | 4,785.0 | 273,550.7
Fair Value | 362,373.7 | $ 4,806.7 | 272,886.8
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Debentures |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 236,717.2 |  | 247,869.1
Fair Value | 237,980.3 |  | 247,152.5
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Commercial paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 124,024.3 |  | 25,681.6
Fair Value | ₨ 124,393.4 |  | ₨ 25,734.3

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