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Loans by Facility (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 INR (₨) | Mar. 31, 2014 INR (₨)
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | ₨ 5,988,909.7 | $ 92,350.2 | ₨ 4,992,834.4 |  |  |
Less: Allowance for credit losses | 78,496.9 | 1,210.5 | 57,360.1 | $ 884.5 | ₨ 47,334.1 | ₨ 42,613.2
Total | 5,910,412.8 | 91,139.7 | 4,935,474.3 |  |  |
Retail Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 4,048,961.3 | 62,435.8 | 3,458,565.7 |  |  |
Retail Loans | Auto loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 720,657.8 | 11,112.7 | 589,010.3 |  |  |
Retail Loans | Personal loans/Credit card |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 841,806.8 | 12,980.8 | 626,152.2 |  |  |
Retail Loans | Retail Business Banking |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 913,720.2 | 14,089.7 | 791,857.3 |  |  |
Retail Loans | Commercial vehicle and construction equipment finance |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 460,365.2 | 7,098.9 | 369,992.4 |  |  |
Retail Loans | Housing loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 383,866.9 | 5,919.3 | 318,692.0 |  |  |
Retail Loans | Other Retail |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 728,544.4 | 11,234.4 | 762,861.5 |  |  |
Wholesale loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | ₨ 1,939,948.4 | $ 29,914.4 | ₨ 1,534,268.7 |  |  |

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