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Allowance for Credit Losses (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2022
INR (₨)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
INR (₨)
Mar. 31, 2020
INR (₨)
Mar. 31, 2022
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period ₨ 343,528.7 $ 4,527.9 ₨ 198,833.2 ₨ 148,232.0  
Write-offs (134,017.8) (1,766.5) (119,470.7) (92,679.6)  
Net allowance for credit losses 163,160.9 [1] 2,150.5 [1] 183,153.2 [2] 143,280.8 [3]  
Allowance for credit losses, end of the period 372,671.8 $ 4,911.9 343,528.7 198,833.2  
Allowance for credit losses:          
Allowance individually evaluated for impairment 38,454.1   36,933.6 26,426.4 $ 506.8
Allowance collectively evaluated for impairment 334,217.7   306,595.1 172,406.8 4,405.1
Loans:          
Loans individually evaluated for impairment 44,738.1   46,553.7 35,423.4 589.7
Loans collectively evaluated for impairment 14,364,805.9   11,997,164.2 10,588,432.2 $ 189,334.4
Impact of ASC 326 Adoption          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Impact of Adopting ASC 326     81,013.0    
Auto loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 39,396.1   19,219.0    
Write-offs (19,376.9)   (13,263.5)    
Net allowance for credit losses 21,750.2 [1]   23,559.7 [2]    
Allowance for credit losses, end of the period 41,769.4   39,396.1 19,219.0  
Allowance for credit losses:          
Allowance individually evaluated for impairment 18.4   34.7    
Allowance collectively evaluated for impairment 41,751.0   39,361.4    
Loans:          
Loans individually evaluated for impairment 31.5   49.5    
Loans collectively evaluated for impairment 1,042,761.5   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 110,081.0   47,097.1    
Write-offs (74,500.8)   (61,571.8)    
Net allowance for credit losses 75,986.2 [1]   86,464.6 [2]    
Allowance for credit losses, end of the period 111,566.4   110,081.0 47,097.1  
Allowance for credit losses:          
Allowance individually evaluated for impairment 6.5   4.0    
Allowance collectively evaluated for impairment 111,559.9   110,077.0    
Loans:          
Loans individually evaluated for impairment 29.4   4.2    
Loans collectively evaluated for impairment 2,341,942.4   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 42,288.4   32,860.3    
Write-offs (3,027.7)   (14,951.6)    
Net allowance for credit losses 9,794.3 [1]   20,432.2 [2]    
Allowance for credit losses, end of the period 49,055.0   42,288.4 32,860.3  
Allowance for credit losses:          
Allowance individually evaluated for impairment 2,651.4   3,540.7    
Allowance collectively evaluated for impairment 46,403.6   38,747.7    
Loans:          
Loans individually evaluated for impairment 2,651.4   3,560.8    
Loans collectively evaluated for impairment 2,614,435.7   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 26,356.7   20,463.4    
Write-offs (16,592.0)   (15,921.5)    
Net allowance for credit losses 21,986.2 [1]   21,489.3 [2]    
Allowance for credit losses, end of the period 31,750.9   26,356.7 20,463.4  
Allowance for credit losses:          
Allowance individually evaluated for impairment 65.8   59.6    
Allowance collectively evaluated for impairment 31,685.1   26,297.1    
Loans:          
Loans individually evaluated for impairment 66.3   59.7    
Loans collectively evaluated for impairment 950,999.7   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 4,578.0   1,700.7    
Write-offs (601.6)   (190.8)    
Net allowance for credit losses (1,284.2) [1]   1,408.6 [2]    
Allowance for credit losses, end of the period 2,692.2   4,578.0 1,700.7  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0    
Allowance collectively evaluated for impairment 2,692.2   4,578.0    
Loans:          
Loans individually evaluated for impairment 0.0   0.0    
Loans collectively evaluated for impairment 830,882.4   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 49,229.2   37,864.3    
Write-offs (17,567.4)   (9,942.8)    
Net allowance for credit losses 29,775.2 [1]   21,073.4 [2]    
Allowance for credit losses, end of the period 61,437.0   49,229.2 37,864.3  
Allowance for credit losses:          
Allowance individually evaluated for impairment 92.3   72.1    
Allowance collectively evaluated for impairment 61,344.7   49,157.1    
Loans:          
Loans individually evaluated for impairment 126.6   92.7    
Loans collectively evaluated for impairment 1,526,607.8   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 71,599.3   39,628.4    
Write-offs (2,351.4)   (3,628.7)    
Net allowance for credit losses 5,153.0 [1]   8,725.4 [2]    
Allowance for credit losses, end of the period 74,400.9   71,599.3 39,628.4  
Allowance for credit losses:          
Allowance individually evaluated for impairment 35,619.7   33,222.5    
Allowance collectively evaluated for impairment 38,781.2   38,376.8    
Loans:          
Loans individually evaluated for impairment 41,832.9   42,786.8    
Loans collectively evaluated for impairment ₨ 5,057,176.4   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  
Write-offs       (11,524.3)  
Net allowance for credit losses [3]       13,169.8  
Allowance for credit losses, end of the period       7,814.5  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment       7,814.5  
Loans:          
Loans individually evaluated for impairment       0.0  
Loans collectively evaluated for impairment       15,279.2  
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  
Write-offs       (41,646.3)  
Net allowance for credit losses [3]       40,487.4  
Allowance for credit losses, end of the period       8,535.1  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment       8,535.1  
Loans:          
Loans individually evaluated for impairment       0.0  
Loans collectively evaluated for impairment       14,481.7  
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  
Write-offs       (9,379.0)  
Net allowance for credit losses [3]       9,471.1  
Allowance for credit losses, end of the period       21,687.4  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment       21,687.4  
Loans:          
Loans individually evaluated for impairment       0.0  
Loans collectively evaluated for impairment       32,866.3  
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  
Write-offs       (10,838.5)  
Net allowance for credit losses [3]       15,901.0  
Allowance for credit losses, end of the period       11,607.3  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment       11,607.3  
Loans:          
Loans individually evaluated for impairment       0.0  
Loans collectively evaluated for impairment       22,992.2  
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  
Write-offs       (130.3)  
Net allowance for credit losses [3]       439.8  
Allowance for credit losses, end of the period       1,414.7  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment       1,414.7  
Loans:          
Loans individually evaluated for impairment       0.0  
Loans collectively evaluated for impairment       2,921.3  
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  
Write-offs       (12,833.1)  
Net allowance for credit losses [3]       16,508.1  
Allowance for credit losses, end of the period       24,116.5  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment       24,116.5  
Loans:          
Loans individually evaluated for impairment       0.0  
Loans collectively evaluated for impairment       33,462.8  
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  
Write-offs       (6,328.1)  
Net allowance for credit losses [3]       12,521.3  
Allowance for credit losses, end of the period       26,426.4  
Allowance for credit losses:          
Allowance individually evaluated for impairment       26,426.4  
Allowance collectively evaluated for impairment       0.0  
Loans:          
Loans individually evaluated for impairment       35,423.4  
Loans collectively evaluated for impairment       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  
Write-offs       0.0  
Net allowance for credit losses [3]       31,088.3  
Allowance for credit losses, end of the period       84,029.4  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment       84,029.4  
Loans:          
Loans individually evaluated for impairment       0.0  
Loans collectively evaluated for impairment       6,918,796.9  
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  
Write-offs       0.0  
Net allowance for credit losses [3]       3,694.0  
Allowance for credit losses, end of the period       13,201.9  
Allowance for credit losses:          
Allowance individually evaluated for impairment       0.0  
Allowance collectively evaluated for impairment       13,201.9  
Loans:          
Loans individually evaluated for impairment       0.0  
Loans collectively evaluated for impairment       ₨ 3,547,631.8  
[1] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 36,181.2 million (US$ 476.9 million). Recoveries from retail loans is Rs. 35,385.3 million and from wholesale loans is Rs. 796.1 million.
[2] 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.
[3] 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 are Rs. 22,548.7 million and from wholesale loans are Rs. 3,110.2 million.