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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