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Loans - Allowance for Credit Losses (Parenthetical) (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨) | Mar. 31, 2023 INR (₨)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Cash recoveries, recoveries against write off cases | ₨ 46,492.3 | $ 544.3 | ₨ 48,690.9 | ₨ 56,142.6
Retail loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Recoveries of loans | 46,314.2 |  | 44,432.2 | 53,374.2
Wholesale loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Recoveries of loans | ₨ 178.1 |  | ₨ 4,258.7 | ₨ 2,768.4

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