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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, 2016
INR (₨)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
INR (₨)
Mar. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments ₨ 52,982.7   ₨ 39,324.8 $ 799.7
Unpaid principal balance 52,982.7   39,324.8 799.7
Related specific allowance 31,008.1   24,709.0 468.0
Average recorded investments 46,154.0 $ 696.7 34,505.8  
Finance receivable on non-accrual status 48,691.4   36,893.6 $ 735.0
Retail Loans | Auto loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 4,494.5   2,718.7  
Unpaid principal balance 4,494.5   2,718.7  
Related specific allowance 2,101.1   1,226.0  
Average recorded investments 3,606.6   2,282.0  
Finance receivable on non-accrual status 4,494.5   2,718.7  
Retail Loans | Personal loans/Credit card        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 4,441.6   2,648.4  
Unpaid principal balance 4,441.6   2,648.4  
Related specific allowance 2,638.6   1,634.0  
Average recorded investments 3,545.0   2,316.4  
Finance receivable on non-accrual status 4,441.6   2,648.4  
Retail Loans | Retail Business Banking        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 15,486.0   10,012.5  
Unpaid principal balance 15,486.0   10,012.5  
Related specific allowance 10,617.5   7,105.6  
Average recorded investments 12,749.3   8,558.6  
Finance receivable on non-accrual status 15,485.5   9,723.4  
Retail Loans | Commercial vehicle and construction equipment finance        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 5,150.7   5,559.4  
Unpaid principal balance 5,150.7   5,559.4  
Related specific allowance 3,876.7   3,630.6  
Average recorded investments 5,355.1   5,883.6  
Finance receivable on non-accrual status 5,150.7   5,559.4  
Retail Loans | Housing loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 1,068.6   242.7  
Unpaid principal balance 1,068.6   242.7  
Related specific allowance 410.4   127.4  
Average recorded investments 655.7   224.3  
Finance receivable on non-accrual status 1,068.6   242.7  
Retail Loans | Other Loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 6,781.6   4,653.5  
Unpaid principal balance 6,781.6   4,653.5  
Related specific allowance 3,950.4   2,901.6  
Average recorded investments 5,717.6   4,117.0  
Finance receivable on non-accrual status 6,781.6   4,653.5  
Wholesale loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investments 15,559.7   13,489.6  
Unpaid principal balance 15,559.7   13,489.6  
Related specific allowance 7,413.4   8,083.8  
Average recorded investments 14,524.7   11,123.9  
Finance receivable on non-accrual status ₨ 11,268.9   ₨ 11,347.5