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Concentrations of credit risk - Exposures to Ten Largest Borrowers Computed as per RBI Guidelines, Based on Higher of Outstanding Balance or Limit on Loans, Investments (Including Credit Substitutes) and Non-Funded Exposures (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
Concentration Risk [Line Items] |  |  |
Total Exposure | ₨ 31,442,082.5 | $ 368,044.9 | ₨ 29,028,502.3
Borrower 1 |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 265,155.5 | 3,103.8 | 301,241.8
Borrower 1 | Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 263,155.5 |  | 301,241.8
Borrower 1 | Non-Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 2,000.0 |  | 0.0
Borrower 2 |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 234,939.9 | 2,750.1 | 278,173.5
Borrower 2 | Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 234,939.9 |  | 276,973.5
Borrower 2 | Non-Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 0.0 |  | 1,200.0
Borrower 3 |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 228,114.3 | 2,670.2 | 220,801.0
Borrower 3 | Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 227,914.3 |  | 220,801.0
Borrower 3 | Non-Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 200.0 |  | 0.0
Borrower 4 |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 225,131.7 | 2,635.3 | 214,797.5
Borrower 4 | Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 225,131.7 |  | 214,755.0
Borrower 4 | Non-Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 0.0 |  | 42.5
Borrower 5 |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 207,225.5 | 2,425.7 | 212,970.4
Borrower 5 | Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 205,523.2 |  | 212,970.4
Borrower 5 | Non-Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 1,702.3 |  | 0.0
Borrower 6 |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 182,922.5 | 2,141.2 | 188,163.3
Borrower 6 | Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 91,969.7 |  | 187,963.3
Borrower 6 | Non-Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 90,952.8 |  | 200.0
Borrower 7 |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 176,032.0 | 2,060.5 | 175,028.1
Borrower 7 | Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 176,019.5 |  | 175,000.0
Borrower 7 | Non-Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 12.5 |  | 28.1
Borrower 8 |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 173,811.1 | 2,034.5 | 168,999.1
Borrower 8 | Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 168,639.0 |  | 163,105.7
Borrower 8 | Non-Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 5,172.1 |  | 5,893.4
Borrower 9 |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 164,937.1 | 1,930.7 | 160,539.2
Borrower 9 | Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 63,492.5 |  | 47,933.7
Borrower 9 | Non-Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 101,444.6 |  | 112,605.5
Borrower 10 |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 154,882.6 | $ 1,813.0 | 145,271.0
Borrower 10 | Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | 153,855.0 |  | 145,250.0
Borrower 10 | Non-Funded Exposure |  |  |
Concentration Risk [Line Items] |  |  |
Total Exposure | ₨ 1,027.6 |  | ₨ 21.0

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 + Details
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