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Summary Information Relating to Non-performing Loans (Detail) Loans (Detail) - Gross Loans ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨) | Mar. 31, 2020 INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average impaired loans | ₨ 205,526.0 | $ 2,708.9 | ₨ 185,604.7 | ₨ 148,924.7
Interest income recognized on non-performing loans | ₨ 11,881.0 | $ 156.6 | ₨ 7,025.3 | ₨ 10,160.5

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