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Summary of Significant Accounting Policies - Summary of the Table Illustrates the Impact on Allowances for Credit Losses on Adopting ASC 326 (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2021
INR (₨)
Mar. 31, 2021
USD ($)
Apr. 01, 2020
INR (₨)
Mar. 31, 2020
INR (₨)
Loans and Leases Receivable Disclosure [Line Items]        
Loans ₨ 11,700,189.2 $ 159,969.8   ₨ 10,425,022.4
As reported under ASC 326        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures and undrawn commitments     ₨ 5,523.4  
Allowance for Credit Losses Other     186.8  
Total     285,556.4  
As reported under ASC 326 | Auto loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     29,099.9  
As reported under ASC 326 | Personal loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     85,188.2  
As reported under ASC 326 | Retail Business Banking        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     36,807.8  
As reported under ASC 326 | Commercial vehicle and construction equipment finance        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     20,788.9  
As reported under ASC 326 | Housing loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     3,360.2  
As reported under ASC 326 | Other retail loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     38,098.6  
As reported under ASC 326 | Wholesale loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     66,502.6  
As reported under ASC 326 | Allowance for Credit Losses on Loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     279,846.2  
As reported under ASC 326 | Allowance for Credit Losses on AFS debt securities        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Credit Losses on AFS debt securities     0.0  
Pre-ASC 326 adoption        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures and undrawn commitments     3,226.8  
Allowance for Credit Losses Other     0.0  
Total     202,060.0  
Pre-ASC 326 adoption | Auto loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     19,219.0  
Pre-ASC 326 adoption | Personal loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     47,097.1  
Pre-ASC 326 adoption | Retail Business Banking        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     32,860.3  
Pre-ASC 326 adoption | Commercial vehicle and construction equipment finance        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     20,463.4  
Pre-ASC 326 adoption | Housing loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     1,700.7  
Pre-ASC 326 adoption | Other retail loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     37,864.3  
Pre-ASC 326 adoption | Wholesale loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     39,628.4  
Pre-ASC 326 adoption | Allowance for Credit Losses on Loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     198,833.2  
Pre-ASC 326 adoption | Allowance for Credit Losses on AFS debt securities        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Credit Losses on AFS debt securities     0.0  
Impact of ASC 326 Adoption        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures and undrawn commitments     2,296.6  
Allowance for Credit Losses Other     186.8  
Total     83,496.4  
Impact of ASC 326 Adoption | Auto loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     9,880.9  
Impact of ASC 326 Adoption | Personal loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     38,091.1  
Impact of ASC 326 Adoption | Retail Business Banking        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     3,947.5  
Impact of ASC 326 Adoption | Commercial vehicle and construction equipment finance        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     325.5  
Impact of ASC 326 Adoption | Housing loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     1,659.5  
Impact of ASC 326 Adoption | Other retail loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     234.3  
Impact of ASC 326 Adoption | Wholesale loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     26,874.2  
Impact of ASC 326 Adoption | Allowance for Credit Losses on Loans        
Loans and Leases Receivable Disclosure [Line Items]        
Loans     81,013.0  
Impact of ASC 326 Adoption | Allowance for Credit Losses on AFS debt securities        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Credit Losses on AFS debt securities     ₨ 0.0