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Investments, Available for Sale Debt Securities - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
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Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨) | Mar. 31, 2018 INR (₨) | Mar. 31, 2020 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available for sale investments, amount kept as margins for clearing, collateral borrowing and lending obligation (CBLO) and real time gross settlement (RTGS) | ₨ 1,760,859.1 |  | ₨ 1,634,673.3 |  | $ 23,356.7
Available-for-Sale Debt Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available for sale investments, amount eligible towards the Bank's statutory liquidity reserve requirements | 2,876,996.4 |  | 2,309,003.7 |  | 38,161.5
Available for sale investments, amount kept as margins for clearing, collateral borrowing and lending obligation (CBLO) and real time gross settlement (RTGS) | 1,760,859.1 |  | 1,634,673.3 |  | $ 23,356.7
Other than temporary impairment losses on available for sale securities | ₨ 9,109.0 | $ 120.8 | ₨ 1,081.0 | ₨ 149.1 |

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