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Financing Receivable, Allowance for Credit Loss on adopting ASC 326 (Detail)
₨ in Millions, $ in Millions
Apr. 01, 2020
INR (₨)
Mar. 31, 2022
INR (₨)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
INR (₨)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
INR (₨)
Mar. 31, 2019
INR (₨)
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance   ₨ 372,671.8 $ 4,911.9 ₨ 343,528.7 $ 4,527.9 ₨ 198,833.2 ₨ 148,232.0
Allowance for Credit Losses on AFS debt securities   0.0 $ 0.0 2,915.1 $ 38.4 0.0  
Auto mobile Loan              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance   41,769.4   39,396.1   19,219.0  
Personal Loans and Credit Card Financing Receivable [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance   111,566.4   110,081.0   47,097.1  
Retail Business Banking              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance   49,055.0   42,288.4   32,860.3  
Commercial Vehicle and Construction Equipment Finance [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance   31,750.9   26,356.7   20,463.4  
Home Equity Loan [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance   2,692.2   4,578.0   1,700.7  
Other Retail              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance   ₨ 61,437.0   ₨ 49,229.2   ₨ 37,864.3  
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
As reported under ASC 326 Total ₨ 285,556.4            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Auto loans              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Notes Receivable Gross 279,846.2            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | AFS debt securities [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Allowance for Credit Losses on AFS debt securities 0.0            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Off Balance Sheet Credit Exposures and undrawn commitments [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures and undrawn commitments 5,523.4            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Credit Losses Other [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Allowance for Credit Losses Other 186.8            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Auto mobile Loan              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Notes Receivable Gross 29,099.9            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Personal Loans and Credit Card Financing Receivable [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Notes Receivable Gross 85,188.2            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Retail Business Banking              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Notes Receivable Gross 36,807.8            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Commercial Vehicle and Construction Equipment Finance [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Notes Receivable Gross 20,788.9            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Home Equity Loan [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Notes Receivable Gross 3,360.2            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Other Retail              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Notes Receivable Gross 38,098.6            
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Notes Receivable Gross 66,502.6            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 202,060.0            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Auto loans              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 198,833.2            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | AFS debt securities [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 0.0            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Off Balance Sheet Credit Exposures and undrawn commitments [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 3,226.8            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Credit Losses Other [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 0.0            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Auto mobile Loan              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 19,219.0            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Personal Loans and Credit Card Financing Receivable [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 47,097.1            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Retail Business Banking              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 32,860.3            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Commercial Vehicle and Construction Equipment Finance [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 20,463.4            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Home Equity Loan [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 1,700.7            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Other Retail              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 37,864.3            
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Loans and Leases Receivable, Allowance 39,628.4            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Impact of ASC 326 adoption Total 83,496.4            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Auto loans              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 81,013.0            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | AFS debt securities [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Impact of Allowance for Credit Losses on AFS debt securities 0.0            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Off Balance Sheet Credit Exposures and undrawn commitments [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Impact of Allowance for Credit Losses on Off-Balance Sheet Credit Exposures and undrawn commitments 2,296.6            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Credit Losses Other [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Impact of Allowance for Credit Losses Other 186.8            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Auto mobile Loan              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 9,880.9            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Personal Loans and Credit Card Financing Receivable [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 38,091.1            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Retail Business Banking              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 3,947.5            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Commercial Vehicle and Construction Equipment Finance [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 325.5            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Home Equity Loan [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 1,659.5            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Other Retail              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 234.3            
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items]              
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method ₨ 26,874.2