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v3.25.2

Credit substitutes - Fair Value of Credit Substitutes by Type of Instrument (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | ₨ 9,910,174.3 | $ 116,003.4 | ₨ 8,295,487.1
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 161,308.5 | 1,888.2 | 133,197.8
Fair Value | 161,179.6 | $ 1,886.7 | 131,486.9
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Debentures |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 160,975.7 |  | 132,926.5
Fair Value | 161,147.8 |  | 131,458.6
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Preference shares |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 332.8 |  | 271.3
Fair Value | 31.8 |  | 28.3
Debt securities, other than asset and mortgage-backed securities | Credit Substitutes | Commercial paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 0.0 |  | 0.0
Fair Value | ₨ 0.0 |  | ₨ 0.0

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