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Loans by Facility (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
INR (₨)
Mar. 31, 2015
INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans ₨ 7,376,179.0 $ 113,288.0 ₨ 5,988,909.7      
Less: Allowance for credit losses 112,507.2 1,728.0 78,496.9 $ 1,205.6 ₨ 57,360.1 ₨ 47,334.1
Total 7,263,671.8 111,560.0 5,910,412.8      
Retail Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 5,213,364.6 80,070.2 4,048,961.3      
Retail Loans | Auto loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 885,234.7 13,596.0 720,657.8      
Retail Loans | Personal loans/Credit card            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 1,187,127.1 18,232.6 841,806.8      
Retail Loans | Retail Business Banking            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 1,305,219.8 20,046.4 913,720.2      
Retail Loans | Commercial vehicle and construction equipment finance            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 595,813.6 9,150.9 460,365.2      
Retail Loans | Housing loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 362,718.1 5,570.9 383,866.9      
Retail Loans | Other Retail            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 877,251.3 13,473.4 728,544.4      
Wholesale loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans ₨ 2,162,814.4 $ 33,217.8 ₨ 1,939,948.4