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Investments, held for trading - Portfolio of Trading Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | ₨ 548,835.8 | $ 6,424.4 | ₨ 392,828.3
Gross Unrealized Gains | 88,300.1 | 1,033.6 | 76,054.3
Gross Unrealized Losses | 11,747.4 | 137.5 | 7,637.3
Fair Value | 625,388.5 | $ 7,320.5 | 461,245.3
Debt Securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 247,848.8 |  | 103,506.9
Gross Unrealized Gains | 392.1 |  | 136.1
Gross Unrealized Losses | 207.6 |  | 205.0
Fair Value | 248,033.3 |  | 103,438.0
Debt Securities | Government of India securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 156,198.9 |  | 71,673.0
Gross Unrealized Gains | 215.3 |  | 58.8
Gross Unrealized Losses | 8.2 |  | 0.0
Fair Value | 156,406.0 |  | 71,731.8
Debt Securities | Other corporate/financial institution securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 91,649.9 |  | 31,833.9
Gross Unrealized Gains | 176.8 |  | 77.3
Gross Unrealized Losses | 199.4 |  | 205.0
Fair Value | 91,627.3 |  | 31,706.2
Other securities (including mutual fund units) |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 300,987.0 |  | 289,321.4
Gross Unrealized Gains | 87,908.0 |  | 75,918.2
Gross Unrealized Losses | 11,539.8 |  | 7,432.3
Fair Value | ₨ 377,355.2 |  | ₨ 357,807.3

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