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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, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments ₨ 140,422.5   ₨ 108,717.3 $ 2,030.4
Unpaid principal balance 140,422.5   108,717.3 2,030.4
Related specific allowance 85,783.0   62,600.5 1,240.4
Average recorded investments 124,570.0 $ 1,801.2 95,848.8  
Finance receivable on non-accrual status 140,422.5   108,717.3 $ 2,030.4
Retail Loans | Auto loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 13,606.7   8,634.5  
Unpaid principal balance 13,606.7   8,634.5  
Related specific allowance 6,169.0   3,682.2  
Average recorded investments 11,120.6   7,370.1  
Finance receivable on non-accrual status 13,606.7   8,634.5  
Retail Loans | Personal loans/Credit card        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 15,781.5   10,150.9  
Unpaid principal balance 15,781.5   10,150.9  
Related specific allowance 9,694.0   6,182.6  
Average recorded investments 12,966.2   8,309.2  
Finance receivable on non-accrual status 15,781.5   10,150.9  
Retail Loans | Retail Business Banking        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 29,945.0   25,547.2  
Unpaid principal balance 29,945.0   25,547.2  
Related specific allowance 21,595.3   18,709.4  
Average recorded investments 27,746.1   23,303.7  
Finance receivable on non-accrual status 29,945.0   25,547.2  
Retail Loans | Commercial vehicle and construction equipment finance        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 11,254.9   6,968.1  
Unpaid principal balance 11,254.9   6,968.1  
Related specific allowance 6,544.8   4,806.1  
Average recorded investments 9,111.5   6,527.4  
Finance receivable on non-accrual status 11,254.9   6,968.1  
Retail Loans | Housing loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 2,157.1   1,899.5  
Unpaid principal balance 2,157.1   1,899.5  
Related specific allowance 1,105.2   974.4  
Average recorded investments 2,028.3   1,788.9  
Finance receivable on non-accrual status 2,157.1   1,899.5  
Retail Loans | Other Retail        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 29,523.6   22,704.3  
Unpaid principal balance 29,523.6   22,704.3  
Related specific allowance 20,441.5   12,922.8  
Average recorded investments 26,114.0   17,005.2  
Finance receivable on non-accrual status 29,523.6   22,704.3  
Wholesale loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 38,153.7   32,812.8  
Unpaid principal balance 38,153.7   32,812.8  
Related specific allowance 20,233.2   15,323.0  
Average recorded investments 35,483.3   31,544.3  
Finance receivable on non-accrual status ₨ 38,153.7   ₨ 32,812.8