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Allowance for Credit Losses (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Mar. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period ₨ 112,507.2 $ 1,626.8 ₨ 78,496.9 ₨ 57,360.1  
Write-offs (53,331.6) (771.1) (37,978.3) (26,563.2)  
Net allowance for credit losses 89,056.4 [1] 1,287.7 [1] 71,988.6 [2] 47,700.0 [3]  
Allowance for credit losses, end of the period 148,232.0 $ 2,143.4 112,507.2 78,496.9  
Allowance for credit losses:          
Allowance individually evaluated for impairment 20,233.2   15,323.0 11,713.5 $ 292.6
Allowance collectively evaluated for impairment 127,998.8   97,184.2 66,783.4 1,850.8
Loans:          
Loans individually evaluated for impairment 38,153.7   32,812.8 30,275.7 551.7
Loans collectively evaluated for impairment 9,073,310.9   7,343,366.2 5,958,634.0 $ 131,193.0
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 3,682.2   2,792.9 2,101.1  
Write-offs (9,155.3)   (6,826.4) (5,155.0)  
Net allowance for credit losses 11,642.1 [1]   7,715.7 [2] 5,846.8 [3]  
Allowance for credit losses, end of the period 6,169.0   3,682.2 2,792.9  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 6,169.0   3,682.2 2,792.9  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 13,606.7   8,634.5 6,105.6  
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 6,182.6   4,040.0 2,638.6  
Write-offs (25,197.0)   (16,714.3) (11,639.3)  
Net allowance for credit losses 28,708.4 [1]   18,856.9 [2] 13,040.7 [3]  
Allowance for credit losses, end of the period 9,694.0   6,182.6 4,040.0  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 9,694.0   6,182.6 4,040.0  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 15,781.5   10,150.9 6,467.4  
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 18,709.4   15,278.4 10,617.5  
Write-offs (6,665.5)   (5,730.0) (1,453.4)  
Net allowance for credit losses 9,551.4 [1]   9,161.0 [2] 6,114.3 [3]  
Allowance for credit losses, end of the period 21,595.3   18,709.4 15,278.4  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 21,595.3   18,709.4 15,278.4  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 29,945.0   25,547.2 21,060.1  
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 4,806.1   4,398.5 3,876.7  
Write-offs (4,812.8)   (3,644.0) (3,227.4)  
Net allowance for credit losses 6,551.5 [1]   4,051.6 [2] 3,749.2 [3]  
Allowance for credit losses, end of the period 6,544.8   4,806.1 4,398.5  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 6,544.8   4,806.1 4,398.5  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 11,254.9   6,968.1 6,086.6  
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 974.4   739.3 410.4  
Write-offs (93.3)   (61.5) (32.9)  
Net allowance for credit losses 224.1 [1]   296.6 [2] 361.8 [3]  
Allowance for credit losses, end of the period 1,105.2   974.4 739.3  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 1,105.2   974.4 739.3  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 2,157.1   1,899.5 1,678.2  
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 12,922.8   6,767.5 3,950.4  
Write-offs (5,652.0)   (4,557.4) (2,793.5)  
Net allowance for credit losses 13,170.7 [1]   10,712.7 [2] 5,610.6 [3]  
Allowance for credit losses, end of the period 20,441.5   12,922.8 6,767.5  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 20,441.5   12,922.8 6,767.5  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 29,523.6   22,704.3 11,306.1  
Specific allowance for credit losses | Wholesale loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 15,323.0   11,713.5 7,413.4  
Write-offs (1,755.7)   (444.7) (2,261.7)  
Net allowance for credit losses 6,665.9 [1]   4,054.2 [2] 6,561.8 [3]  
Allowance for credit losses, end of the period 20,233.2   15,323.0 11,713.5  
Allowance for credit losses:          
Allowance individually evaluated for impairment 20,233.2   15,323.0 11,713.5  
Allowance collectively evaluated for impairment 0.0   0.0 0.0  
Loans:          
Loans individually evaluated for impairment 38,153.7   32,812.8 30,275.7  
Loans collectively evaluated for impairment 0.0   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 42,147.4   28,110.6 22,548.6  
Write-offs 0.0   0.0 0.0  
Net allowance for credit losses 10,793.7 [1]   14,036.8 [2] 5,562.0 [3]  
Allowance for credit losses, end of the period 52,941.1   42,147.4 28,110.6  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 52,941.1   42,147.4 28,110.6  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 6,135,634.8   5,137,460.1 3,996,257.3  
Unallocated allowance for credit losses | Wholesale loans          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, beginning of the period 7,759.3   4,656.2 3,803.4  
Write-offs 0.0   0.0 0.0  
Net allowance for credit losses 1,748.6 [1]   3,103.1 [2] 852.8 [3]  
Allowance for credit losses, end of the period 9,507.9   7,759.3 4,656.2  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 9,507.9   7,759.3 4,656.2  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment ₨ 2,835,407.3   ₨ 2,130,001.6 ₨ 1,909,672.7  
[1] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 16,777.1 million (US$ 242.6 million). Recoveries from Retail loans is Rs. 16,590.9 million and from wholesale loans is Rs. 186.2 million.
[2] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 12,590.8 million. Recoveries from Retail loans is Rs. 12,254.3 million and from Wholesale loans is Rs. 336.5 million.
[3] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 9,748.6 million. Recoveries from Retail loans is Rs. 8,943.7 million and from Wholesale loans is Rs. 804.9 million.