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Loans - Maturity of Gross Loans (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gross loans | ₨ 28,638,811.1 | $ 335,231.3 | ₨ 26,793,047.4
Wholesale loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gross loans | 7,107,245.7 | 83,193.8 | 7,202,639.3
Retail loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gross loans | 21,531,565.4 | 252,037.5 | ₨ 19,590,408.1
Gross Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Within one year | 7,409,894.1 |  |
Over one year through five years | 14,255,720.6 |  |
Over five years | 6,973,196.4 |  |
Total gross loans | 28,638,811.1 | 335,231.3 |
Gross Loans | Wholesale loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Within one year | 2,699,760.8 |  |
Over one year through five years | 3,158,688.8 |  |
Over five years | 1,248,796.1 |  |
Total gross loans | 7,107,245.7 | 83,193.8 |
Gross Loans | Retail loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Within one year | 4,710,133.3 |  |
Over one year through five years | 11,097,031.8 |  |
Over five years | 5,724,400.3 |  |
Total gross loans | ₨ 21,531,565.4 | $ 252,037.5 |

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