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Troubled Debt Restructurings Modifications (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2015
INR (₨)
Mar. 31, 2015
USD ($)
 [1]
Mar. 31, 2014
INR (₨)
Mar. 31, 2015
USD ($)
 [1]
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value ₨ 2,194.8 [1]   ₨ 250.9 [2] $ 35.2
Balance of Principal Forgiven 0.0 [1] $ 0.0 0.0 [2]  
Net P&L impact [3] 185.8 [1] $ 3.0 154.8 [2]  
Retail Business Banking        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value 257.5   83.9  
Balance of Principal Forgiven 0.0   0.0  
Net P&L impact [3] 9.8   7.8  
Wholesale loans        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value 1,937.3   167.0  
Balance of Principal Forgiven 0.0   0.0  
Net P&L impact [3] 176.0   147.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal Payments        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value [4] 0.0 [1]   0.0 [2] 0.0
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal Payments | Retail Business Banking        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value [4] 0.0   0.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal Payments | Wholesale loans        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value [4] 0.0   0.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Interest Payments        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value [5] 2,194.8 [1]   250.9 [2] 35.2
Financing Receivable Troubled Debt Restructurings Changes in Amount of Interest Payments | Retail Business Banking        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value [5] 257.5   83.9  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Interest Payments | Wholesale loans        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value [5] 1,937.3   167.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal and Interest Payments        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value 0.0 [1]   0.0 [2] $ 0.0
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal and Interest Payments | Retail Business Banking        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value 0.0   0.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal and Interest Payments | Wholesale loans        
Financing Receivable, Modifications [Line Items]        
TDR modifications carrying value ₨ 0.0   ₨ 0.0  
[1] TDR modification during the year ended March 31, 2015 comprised of six cases.
[2] TDR modification during the year ended March 31, 2014 comprised of four cases.
[3] Balances reflect charge-offs and/or allowance for credit losses and/or income not recognized/deferred
[4] TDRs involving changes in the amount of principal payment may include principal forgiveness or deferral of periodic and/or final principal payments.
[5] TDRs involving changes in the amount of interest payments may involve a reduction in interest rate.