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Allowance for Credit Losses (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Mar. 31, 2018
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period ₨ 78,496.9 $ 1,205.6 ₨ 57,360.1 ₨ 47,334.1  
Write-offs (37,978.3) (583.3) (26,563.2) (20,218.6)  
Net allowance for credit losses 71,988.6 [1] 1,105.7 [1] 47,700.0 [2] 30,244.6 [3]  
Allowance for credit losses, end of the period 112,507.2 $ 1,728.0 78,496.9 57,360.1  
Allowance for credit losses:          
Allowance individually evaluated for impairment 15,323.0   11,713.5 7,413.4 $ 235.3
Allowance collectively evaluated for impairment 97,184.2   66,783.4 49,946.7 1,492.7
Loans:          
Loans individually evaluated for impairment 32,812.8   30,275.7 15,559.7 504.0
Loans collectively evaluated for impairment 7,343,366.2   5,958,634.0 4,977,274.7 $ 112,784.0
Specific allowance for credit losses | Retail Loans | Auto loans          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period 2,792.9   2,101.1 1,226.0  
Write-offs (6,826.4)   (5,155.0) (3,581.4)  
Net allowance for credit losses 7,715.7 [1]   5,846.8 [2] 4,456.5 [3]  
Allowance for credit losses, end of the period 3,682.2   2,792.9 2,101.1  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 3,682.2   2,792.9 2,101.1  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 8,634.5   6,105.6 4,494.5  
Specific allowance for credit losses | Retail Loans | Personal loans/Credit card          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period 4,040.0   2,638.6 1,634.0  
Write-offs (16,714.3)   (11,639.3) (8,296.6)  
Net allowance for credit losses 18,856.9 [1]   13,040.7 [2] 9,301.2 [3]  
Allowance for credit losses, end of the period 6,182.6   4,040.0 2,638.6  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 6,182.6   4,040.0 2,638.6  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 10,150.9   6,467.4 4,441.6  
Specific allowance for credit losses | Retail Loans | Retail Business Banking          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period 15,278.4   10,617.5 7,105.6  
Write-offs (5,730.0)   (1,453.4) (686.1)  
Net allowance for credit losses 9,161.0 [1]   6,114.3 [2] 4,198.0 [3]  
Allowance for credit losses, end of the period 18,709.4   15,278.4 10,617.5  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 18,709.4   15,278.4 10,617.5  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 25,547.2   21,060.1 15,486.0  
Specific allowance for credit losses | Retail Loans | Commercial vehicle and construction equipment finance          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period 4,398.5   3,876.7 3,630.6  
Write-offs (3,644.0)   (3,227.4) (3,065.1)  
Net allowance for credit losses 4,051.6 [1]   3,749.2 [2] 3,311.2 [3]  
Allowance for credit losses, end of the period 4,806.1   4,398.5 3,876.7  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 4,806.1   4,398.5 3,876.7  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 6,968.1   6,086.6 5,150.7  
Specific allowance for credit losses | Retail Loans | Housing loans          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period 739.3   410.4 127.4  
Write-offs (61.5)   (32.9) (29.0)  
Net allowance for credit losses 296.6 [1]   361.8 [2] 312.0 [3]  
Allowance for credit losses, end of the period 974.4   739.3 410.4  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 974.4   739.3 410.4  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 1,899.5   1,678.2 1,068.6  
Specific allowance for credit losses | Retail Loans | Other Retail          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period 6,767.5   3,950.4 2,901.6  
Write-offs (4,557.4)   (2,793.5) (1,818.4)  
Net allowance for credit losses 10,712.7 [1]   5,610.6 [2] 2,867.2 [3]  
Allowance for credit losses, end of the period 12,922.8   6,767.5 3,950.4  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 12,922.8   6,767.5 3,950.4  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 22,704.3   11,306.1 6,781.6  
Specific allowance for credit losses | Wholesale loans          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period 11,713.5   7,413.4 8,083.8  
Write-offs (444.7)   (2,261.7) (2,742.0)  
Net allowance for credit losses 4,054.2 [1]   6,561.8 [2] 2,071.6 [3]  
Allowance for credit losses, end of the period 15,323.0   11,713.5 7,413.4  
Allowance for credit losses:          
Allowance individually evaluated for impairment 15,323.0   11,713.5 7,413.4  
Allowance collectively evaluated for impairment 0.0   0.0 0.0  
Loans:          
Loans individually evaluated for impairment 32,812.8   30,275.7 15,559.7  
Loans collectively evaluated for impairment 0.0   0.0 0.0  
Unallocated allowance for credit losses | Retail Loans          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period 28,110.6   22,548.6 19,376.7  
Write-offs 0.0   0.0    
Net allowance for credit losses 14,036.8 [1]   5,562.0 [2] 3,171.9 [3]  
Allowance for credit losses, end of the period 42,147.4   28,110.6 22,548.6  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 42,147.4   28,110.6 22,548.6  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 5,137,460.1   3,996,257.3 3,421,142.7  
Unallocated allowance for credit losses | Wholesale loans          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period 4,656.2   3,803.4 3,248.4  
Write-offs 0.0   0.0    
Net allowance for credit losses 3,103.1 [1]   852.8 [2] 555.0 [3]  
Allowance for credit losses, end of the period 7,759.3   4,656.2 3,803.4  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 7,759.3   4,656.2 3,803.4  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment ₨ 2,130,001.6   ₨ 1,909,672.7 ₨ 1,518,709.0  
[1] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 12,590.8 million (US$ 193.4 million)
[2] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 9,748.6 million
[3] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 8,713.3 million.