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Allowance for Credit Losses (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2021
INR (₨)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
INR (₨)
Mar. 31, 2019
INR (₨)
Mar. 31, 2021
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period ₨ 198,833.2 $ 2,718.7 ₨ 148,232.0 ₨ 112,507.2  
Write-offs (119,470.7) (1,633.5) (92,679.6) (53,331.6)  
Net allowance for credit losses 183,153.2 [1] 2,504.1 [1] 143,280.8 [2] 89,056.4 [3]  
Allowance for credit losses, end of the period 343,528.7 4,696.9 198,833.2 148,232.0  
Allowance for credit losses:          
Allowance individually evaluated for impairment 36,933.6   26,426.4 20,233.2 $ 505.0
Allowance collectively evaluated for impairment 306,595.1   172,406.8 127,998.8 4,191.9
Loans:          
Loans individually evaluated for impairment 46,553.7   35,423.4 38,153.7 636.5
Loans collectively evaluated for impairment 11,997,164.2   10,588,432.2 9,073,310.9 $ 164,030.2
Impact of ASC 326 Adoption          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impact of Adopting ASC 326 81,013.0 $ 1,107.6      
Auto loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 19,219.0        
Write-offs (13,263.5)        
Net allowance for credit losses [1] 23,559.7        
Allowance for credit losses, end of the period 39,396.1   19,219.0    
Allowance for credit losses:          
Allowance individually evaluated for impairment 34.7        
Allowance collectively evaluated for impairment 39,361.4        
Loans:          
Loans individually evaluated for impairment 49.5        
Loans collectively evaluated for impairment 964,003.7        
Auto loans | Impact of ASC 326 Adoption          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impact of Adopting ASC 326 9,880.9        
Personal loans/Credit card          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 47,097.1        
Write-offs (61,571.8)        
Net allowance for credit losses [1] 86,464.6        
Allowance for credit losses, end of the period 110,081.0   47,097.1    
Allowance for credit losses:          
Allowance individually evaluated for impairment 4.0        
Allowance collectively evaluated for impairment 110,077.0        
Loans:          
Loans individually evaluated for impairment 4.2        
Loans collectively evaluated for impairment 2,042,723.0        
Personal loans/Credit card | Impact of ASC 326 Adoption          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impact of Adopting ASC 326 38,091.1        
Retail Business Banking          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 32,860.3        
Write-offs (14,951.6)        
Net allowance for credit losses [1] 20,432.2        
Allowance for credit losses, end of the period 42,288.4   32,860.3    
Allowance for credit losses:          
Allowance individually evaluated for impairment 3,540.7        
Allowance collectively evaluated for impairment 38,747.7        
Loans:          
Loans individually evaluated for impairment 3,560.8        
Loans collectively evaluated for impairment 2,004,285.1        
Retail Business Banking | Impact of ASC 326 Adoption          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impact of Adopting ASC 326 3,947.5        
Commercial vehicle and construction equipment finance          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 20,463.4        
Write-offs (15,921.5)        
Net allowance for credit losses [1] 21,489.3        
Allowance for credit losses, end of the period 26,356.7   20,463.4    
Allowance for credit losses:          
Allowance individually evaluated for impairment 59.6        
Allowance collectively evaluated for impairment 26,297.1        
Loans:          
Loans individually evaluated for impairment 59.7        
Loans collectively evaluated for impairment 805,270.1        
Commercial vehicle and construction equipment finance | Impact of ASC 326 Adoption          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impact of Adopting ASC 326 325.5        
Housing loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 1,700.7        
Write-offs (190.8)        
Net allowance for credit losses [1] 1,408.6        
Allowance for credit losses, end of the period 4,578.0   1,700.7    
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0        
Allowance collectively evaluated for impairment 4,578.0        
Loans:          
Loans collectively evaluated for impairment 702,235.5        
Housing loans | Impact of ASC 326 Adoption          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impact of Adopting ASC 326 1,659.5        
Other Retail          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 37,864.3        
Write-offs (9,942.8)        
Net allowance for credit losses [1] 21,073.4        
Allowance for credit losses, end of the period 49,229.2   37,864.3    
Allowance for credit losses:          
Allowance individually evaluated for impairment 72.1        
Allowance collectively evaluated for impairment 49,157.1        
Loans:          
Loans individually evaluated for impairment 92.7        
Loans collectively evaluated for impairment 1,306,548.3        
Other Retail | Impact of ASC 326 Adoption          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impact of Adopting ASC 326 234.3        
Wholesale loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 39,628.4        
Write-offs (3,628.7)        
Net allowance for credit losses [1] 8,725.4        
Allowance for credit losses, end of the period 71,599.3   39,628.4    
Allowance for credit losses:          
Allowance individually evaluated for impairment 33,222.5        
Allowance collectively evaluated for impairment 38,376.8        
Loans:          
Loans individually evaluated for impairment 42,786.8        
Loans collectively evaluated for impairment 4,172,098.5        
Wholesale loans | Impact of ASC 326 Adoption          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impact of Adopting ASC 326 26,874.2        
Specific allowance for credit losses | Retail Loans | Auto loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 7,814.5   6,169.0 3,682.2  
Write-offs     (11,524.3) (9,155.3)  
Net allowance for credit losses     13,169.8 [2] 11,642.1 [3]  
Allowance for credit losses, end of the period     7,814.5 6,169.0  
Allowance for credit losses:          
Allowance individually evaluated for impairment     0.0 0.0  
Allowance collectively evaluated for impairment     7,814.5 6,169.0  
Loans:          
Loans individually evaluated for impairment     0.0 0.0  
Loans collectively evaluated for impairment     15,279.2 13,606.7  
Specific allowance for credit losses | Retail Loans | Personal loans/Credit card          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 8,535.1   9,694.0 6,182.6  
Write-offs     (41,646.3) (25,197.0)  
Net allowance for credit losses     40,487.4 [2] 28,708.4 [3]  
Allowance for credit losses, end of the period     8,535.1 9,694.0  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment     8,535.1 9,694.0  
Loans:          
Loans individually evaluated for impairment     0.0 0.0  
Loans collectively evaluated for impairment     14,481.7 15,781.5  
Specific allowance for credit losses | Retail Loans | Retail Business Banking          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 21,687.4   21,595.3 18,709.4  
Write-offs     (9,379.0) (6,665.5)  
Net allowance for credit losses     9,471.1 [2] 9,551.4 [3]  
Allowance for credit losses, end of the period     21,687.4 21,595.3  
Allowance for credit losses:          
Allowance individually evaluated for impairment     0.0 0.0  
Allowance collectively evaluated for impairment     21,687.4 21,595.3  
Loans:          
Loans individually evaluated for impairment     0.0 0.0  
Loans collectively evaluated for impairment     32,866.3 29,945.0  
Specific allowance for credit losses | Retail Loans | Commercial vehicle and construction equipment finance          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 11,607.3   6,544.8 4,806.1  
Write-offs     (10,838.5) (4,812.8)  
Net allowance for credit losses     15,901.0 [2] 6,551.5 [3]  
Allowance for credit losses, end of the period     11,607.3 6,544.8  
Allowance for credit losses:          
Allowance individually evaluated for impairment     0.0 0.0  
Allowance collectively evaluated for impairment     11,607.3 6,544.8  
Loans:          
Loans individually evaluated for impairment     0.0 0.0  
Loans collectively evaluated for impairment     22,992.2 11,254.9  
Specific allowance for credit losses | Retail Loans | Housing loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 1,414.7   1,105.2 974.4  
Write-offs     (130.3) (93.3)  
Net allowance for credit losses     439.8 [2] 224.1 [3]  
Allowance for credit losses, end of the period     1,414.7 1,105.2  
Allowance for credit losses:          
Allowance individually evaluated for impairment     0.0 0.0  
Allowance collectively evaluated for impairment     1,414.7 1,105.2  
Loans:          
Loans individually evaluated for impairment     0.0 0.0  
Loans collectively evaluated for impairment     2,921.3 2,157.1  
Specific allowance for credit losses | Retail Loans | Other Retail          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 24,116.5   20,441.5 12,922.8  
Write-offs     (12,833.1) (5,652.0)  
Net allowance for credit losses     16,508.1 [2] 13,170.7 [3]  
Allowance for credit losses, end of the period     24,116.5 20,441.5  
Allowance for credit losses:          
Allowance individually evaluated for impairment     0.0 0.0  
Allowance collectively evaluated for impairment     24,116.5 20,441.5  
Loans:          
Loans individually evaluated for impairment     0.0 0.0  
Loans collectively evaluated for impairment     33,462.8 29,523.6  
Specific allowance for credit losses | Wholesale loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 26,426.4   20,233.2 15,323.0  
Write-offs     (6,328.1) (1,755.7)  
Net allowance for credit losses     12,521.3 [2] 6,665.9 [3]  
Allowance for credit losses, end of the period     26,426.4 20,233.2  
Allowance for credit losses:          
Allowance individually evaluated for impairment     26,426.4 20,233.2  
Allowance collectively evaluated for impairment     0.0 0.0  
Loans:          
Loans individually evaluated for impairment     35,423.4 38,153.7  
Loans collectively evaluated for impairment     0.0 0.0  
Unallocated allowance for credit losses | Retail Loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 84,029.4   52,941.1 42,147.4  
Write-offs     0.0 0.0  
Net allowance for credit losses     31,088.3 [2] 10,793.7 [3]  
Allowance for credit losses, end of the period     84,029.4 52,941.1  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment     84,029.4 52,941.1  
Loans:          
Loans individually evaluated for impairment       0.0  
Loans collectively evaluated for impairment     6,918,796.9 6,135,634.8  
Unallocated allowance for credit losses | Wholesale loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period ₨ 13,201.9   9,507.9 7,759.3  
Write-offs     0.0 0.0  
Net allowance for credit losses     3,694.0 [2] 1,748.6 [3]  
Allowance for credit losses, end of the period     13,201.9 9,507.9  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment     13,201.9 9,507.9  
Loans:          
Loans individually evaluated for impairment     0.0 0.0  
Loans collectively evaluated for impairment     ₨ 3,547,631.8 ₨ 2,835,407.3  
[1] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 28,919.8 million (US$ 395.4 million). Recoveries from retail loans is Rs. 28,605.8 million and from wholesale loans is Rs. 314.0 million.
[2] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 25,658.9 million. Recoveries from retail loans is Rs. 22,548.7 million and from wholesale loans is Rs. 3,110.2 million.
[3] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 16,777.1 million . Recoveries from retail loans is Rs. 16,590.9 million and from wholesale loans is Rs. 186.2 million.