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Impaired Loans Where Bank is Probable that it will not Collect all Amounts due According to Original Contractual Terms of Loans (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments ₨ 157,426.9   ₨ 140,422.5 $ 2,088.1
Unpaid principal balance 157,426.9   140,422.5 2,088.1
Related specific allowance 101,601.9   85,783.0 1,347.7
Average recorded investments 148,924.9 $ 1,975.4 124,570.0  
Finance receivable on non-accrual status 157,426.9   140,422.5 $ 2,088.1
Retail Loans | Auto loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 15,279.2   13,606.7  
Unpaid principal balance 15,279.2   13,606.7  
Related specific allowance 7,814.5   6,169.0  
Average recorded investments 14,443.0   11,120.6  
Finance receivable on non-accrual status 15,279.2   13,606.7  
Retail Loans | Personal loans/Credit card        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 14,481.7   15,781.5  
Unpaid principal balance 14,481.7   15,781.5  
Related specific allowance 8,535.1   9,694.0  
Average recorded investments 15,131.6   12,966.2  
Finance receivable on non-accrual status 14,481.7   15,781.5  
Retail Loans | Retail Business Banking        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 32,866.3   29,945.0  
Unpaid principal balance 32,866.3   29,945.0  
Related specific allowance 21,687.4   21,595.3  
Average recorded investments 31,405.7   27,746.1  
Finance receivable on non-accrual status 32,866.3   29,945.0  
Retail Loans | Commercial vehicle and construction equipment finance        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 22,992.2   11,254.9  
Unpaid principal balance 22,992.2   11,254.9  
Related specific allowance 11,607.3   6,544.8  
Average recorded investments 17,123.6   9,111.5  
Finance receivable on non-accrual status 22,992.2   11,254.9  
Retail Loans | Housing loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 2,921.3   2,157.1  
Unpaid principal balance 2,921.3   2,157.1  
Related specific allowance 1,414.7   1,105.2  
Average recorded investments 2,539.2   2,028.3  
Finance receivable on non-accrual status 2,921.3   2,157.1  
Retail Loans | Other Retail        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 33,462.8   29,523.6  
Unpaid principal balance 33,462.8   29,523.6  
Related specific allowance 24,116.5   20,441.5  
Average recorded investments 31,493.2   26,114.0  
Finance receivable on non-accrual status 33,462.8   29,523.6  
Wholesale loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 35,423.4   38,153.7  
Unpaid principal balance 35,423.4   38,153.7  
Related specific allowance 26,426.4   20,233.2  
Average recorded investments 36,788.6   35,483.3  
Finance receivable on non-accrual status ₨ 35,423.4   ₨ 38,153.7