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Loans by Facility (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans ₨ 10,623,855.6 $ 140,918.6 ₨ 9,111,464.6      
Less: Allowance for credit losses 198,833.2 2,637.4 148,232.0 $ 1,966.2 ₨ 112,507.2 ₨ 78,496.9
Total 10,425,022.4 138,281.2 8,963,232.6      
Retail Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 7,040,800.4 93,391.6 6,237,903.6      
Retail Loans | Auto loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 952,053.1 12,628.4 951,744.2      
Retail Loans | Personal loans/Credit card            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 1,920,601.6 25,475.5 1,538,107.4      
Retail Loans | Retail Business Banking            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 1,658,770.3 22,002.5 1,478,317.8      
Retail Loans | Commercial vehicle and construction equipment finance            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 747,382.4 9,913.5 746,288.0      
Retail Loans | Housing loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 634,612.4 8,417.7 513,771.6      
Retail Loans | Other Retail            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans 1,127,380.6 14,954.0 1,009,674.6      
Wholesale loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans ₨ 3,583,055.2 $ 47,527.0 ₨ 2,873,561.0