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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, 2017
INR (₨)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
INR (₨)
Mar. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments ₨ 82,979.7   ₨ 52,982.7 $ 1,279.6
Unpaid principal balance 82,979.7   52,982.7 1,279.6
Related specific allowance 45,730.1   31,008.1 705.2
Average recorded investments 67,981.4 $ 1,048.3 46,154.0  
Finance receivable on non-accrual status 82,979.7   48,691.4 $ 1,279.6
Retail Loans | Auto loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 6,105.6   4,494.5  
Unpaid principal balance 6,105.6   4,494.5  
Related specific allowance 2,792.9   2,101.1  
Average recorded investments 5,300.1   3,606.6  
Finance receivable on non-accrual status 6,105.6   4,494.5  
Retail Loans | Personal loans/Credit card        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 6,467.4   4,441.6  
Unpaid principal balance 6,467.4   4,441.6  
Related specific allowance 4,040.0   2,638.6  
Average recorded investments 5,454.5   3,545.0  
Finance receivable on non-accrual status 6,467.4   4,441.6  
Retail Loans | Retail Business Banking        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 21,060.1   15,486.0  
Unpaid principal balance 21,060.1   15,486.0  
Related specific allowance 15,278.4   10,617.5  
Average recorded investments 18,273.1   12,749.3  
Finance receivable on non-accrual status 21,060.1   15,485.5  
Retail Loans | Commercial vehicle and construction equipment finance        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 6,086.6   5,150.7  
Unpaid principal balance 6,086.6   5,150.7  
Related specific allowance 4,398.5   3,876.7  
Average recorded investments 5,618.7   5,355.1  
Finance receivable on non-accrual status 6,086.6   5,150.7  
Retail Loans | Housing loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 1,678.2   1,068.6  
Unpaid principal balance 1,678.2   1,068.6  
Related specific allowance 739.3   410.4  
Average recorded investments 1,373.4   655.7  
Finance receivable on non-accrual status 1,678.2   1,068.6  
Retail Loans | Other Retail        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 11,306.1   6,781.6  
Unpaid principal balance 11,306.1   6,781.6  
Related specific allowance 6,767.5   3,950.4  
Average recorded investments 9,043.9   5,717.6  
Finance receivable on non-accrual status 11,306.1   6,781.6  
Wholesale loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 30,275.7   15,559.7  
Unpaid principal balance 30,275.7   15,559.7  
Related specific allowance 11,713.5   7,413.4  
Average recorded investments 22,917.7   14,524.7  
Finance receivable on non-accrual status ₨ 30,275.7   ₨ 11,268.9