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Troubled Debt Restructurings Modifications (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
 [1]
Mar. 31, 2018
INR (₨)
Mar. 31, 2019
USD ($)
 [1]
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value ₨ 17.9 [1]   ₨ 0.0 [2] $ 0.3
Balance of Principal Forgiven 0.0 [1] $ 0.0 0.0 [2]  
Net P&L impact 4.5 [1],[3] $ 0.1 0.0 [2],[3]  
Retail Loans | Retail Business Banking        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value 17.9   0.0  
Balance of Principal Forgiven 0.0   0.0  
Net P&L impact [3] 4.5   0.0  
Commercial vehicle and construction equipment finance        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value 0.0   0.0  
Balance of Principal Forgiven 0.0   0.0  
Net P&L impact [3] 0.0   0.0  
Wholesale loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value 0.0   0.0  
Balance of Principal Forgiven 0.0   0.0  
Net P&L impact [3] 0.0   0.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal Payments        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value 0.0 [1],[4]   0.0 [2],[4] 0.0
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal Payments | Retail Loans | Retail Business Banking        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value [4] 0.0   0.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal Payments | Commercial vehicle and construction equipment finance        
Financing Receivable, Troubled Debt Restructuring [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, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value [4] 0.0   0.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Interest Payments        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value 17.9 [1],[5]   0.0 [2],[5] 0.3
Financing Receivable Troubled Debt Restructurings Changes in Amount of Interest Payments | Retail Loans | Retail Business Banking        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value [5] 17.9   0.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Interest Payments | Commercial vehicle and construction equipment finance        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value [5] 0.0   0.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Interest Payments | Wholesale loans        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value [5] 0.0   0.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal and Interest Payments        
Financing Receivable, Troubled Debt Restructuring [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 Loans | Retail Business Banking        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value 0.0   0.0  
Financing Receivable Troubled Debt Restructurings Changes in Amount of Principal and Interest Payments | Commercial vehicle and construction equipment finance        
Financing Receivable, Troubled Debt Restructuring [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, Troubled Debt Restructuring [Line Items]        
TDR modifications carrying value ₨ 0.0   ₨ 0.0  
[1] TDR modification during the year ended March 31, 2019 comprised of one case.
[2] TDR modification during the year ended March 31, 2018 comprised of nil case.
[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.