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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, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments ₨ 108,717.3   ₨ 82,979.7 $ 1,669.8
Unpaid principal balance 108,717.3   82,979.7 1,669.8
Related specific allowance 62,600.5   45,730.1 961.5
Average recorded investments 95,848.8 $ 1,472.1 67,981.4  
Finance receivable on non-accrual status 108,717.3   82,979.7 $ 1,669.8
Retail Loans | Auto loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 8,634.5   6,105.6  
Unpaid principal balance 8,634.5   6,105.6  
Related specific allowance 3,682.2   2,792.9  
Average recorded investments 7,370.1   5,300.1  
Finance receivable on non-accrual status 8,634.5   6,105.6  
Retail Loans | Personal loans/Credit card        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 10,150.9   6,467.4  
Unpaid principal balance 10,150.9   6,467.4  
Related specific allowance 6,182.6   4,040.0  
Average recorded investments 8,309.2   5,454.5  
Finance receivable on non-accrual status 10,150.9   6,467.4  
Retail Loans | Retail Business Banking        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 25,547.2   21,060.1  
Unpaid principal balance 25,547.2   21,060.1  
Related specific allowance 18,709.4   15,278.4  
Average recorded investments 23,303.7   18,273.1  
Finance receivable on non-accrual status 25,547.2   21,060.1  
Retail Loans | Commercial vehicle and construction equipment finance        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 6,968.1   6,086.6  
Unpaid principal balance 6,968.1   6,086.6  
Related specific allowance 4,806.1   4,398.5  
Average recorded investments 6,527.4   5,618.7  
Finance receivable on non-accrual status 6,968.1   6,086.6  
Retail Loans | Housing loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 1,899.5   1,678.2  
Unpaid principal balance 1,899.5   1,678.2  
Related specific allowance 974.4   739.3  
Average recorded investments 1,788.9   1,373.4  
Finance receivable on non-accrual status 1,899.5   1,678.2  
Retail Loans | Other Retail        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 22,704.3   11,306.1  
Unpaid principal balance 22,704.3   11,306.1  
Related specific allowance 12,922.8   6,767.5  
Average recorded investments 17,005.2   9,043.9  
Finance receivable on non-accrual status 22,704.3   11,306.1  
Wholesale loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 32,812.8   30,275.7  
Unpaid principal balance 32,812.8   30,275.7  
Related specific allowance 15,323.0   11,713.5  
Average recorded investments 31,544.3   22,917.7  
Finance receivable on non-accrual status ₨ 32,812.8   ₨ 30,275.7