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Allowance for Credit Losses (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2015
INR (₨)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
INR (₨)
Mar. 31, 2015
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses, beginning of the period ₨ 42,613.2 $ 683.9 ₨ 33,694.2  
Write-offs (19,804.0) (317.8) (14,909.1)  
Net allowance for credit losses 24,524.9 [1] 393.5 [1] 23,828.1 [2]  
Allowance for credit losses, end of the period 47,334.1 $ 759.6 42,613.2  
Allowance for credit losses:        
Allowance individually evaluated for impairment 8,083.8   7,316.1 $ 129.7
Allowance collectively evaluated for impairment 39,250.3   35,297.1 629.9
Loans:        
Loans individually evaluated for impairment 13,489.6   8,758.2 216.5
Loans collectively evaluated for impairment 3,929,959.5   3,219,503.1 $ 63,071.0
Specific allowance for credit losses | Retail Loans | Consumer Portfolio Segment        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses, beginning of the period 796.1   556.7  
Write-offs (2,858.9)   (2,150.4)  
Net allowance for credit losses 3,288.8 [1]   2,389.8 [2]  
Allowance for credit losses, end of the period 1,226.0   796.1  
Allowance for credit losses:        
Allowance individually evaluated for impairment 0.0   0.0  
Allowance collectively evaluated for impairment 1,226.0   796.1  
Loans:        
Loans individually evaluated for impairment 0.0   0.0  
Loans collectively evaluated for impairment 2,718.7   1,845.2  
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 1,267.3   1,067.1  
Write-offs (7,418.1)   (5,748.9)  
Net allowance for credit losses 7,784.8 [1]   5,949.1 [2]  
Allowance for credit losses, end of the period 1,634.0   1,267.3  
Allowance for credit losses:        
Allowance individually evaluated for impairment 0.0   0.0  
Allowance collectively evaluated for impairment 1,634.0   1,267.3  
Loans:        
Loans individually evaluated for impairment 0.0   0.0  
Loans collectively evaluated for impairment 2,648.4   1,984.4  
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 5,598.1   5,058.2  
Write-offs (380.8)   (93.7)  
Net allowance for credit losses 1,888.3 [1]   633.6 [2]  
Allowance for credit losses, end of the period 7,105.6   5,598.1  
Allowance for credit losses:        
Allowance individually evaluated for impairment 0.0   0.0  
Allowance collectively evaluated for impairment 7,105.6   5,598.1  
Loans:        
Loans individually evaluated for impairment 0.0   0.0  
Loans collectively evaluated for impairment 10,012.5   7,104.6  
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 3,472.9   2,094.4  
Write-offs (4,327.8)   (5,014.1)  
Net allowance for credit losses 4,485.5 [1]   6,392.6 [2]  
Allowance for credit losses, end of the period 3,630.6   3,472.9  
Allowance for credit losses:        
Allowance individually evaluated for impairment 0.0   0.0  
Allowance collectively evaluated for impairment 3,630.6   3,472.9  
Loans:        
Loans individually evaluated for impairment 0.0   0.0  
Loans collectively evaluated for impairment 5,559.4   6,207.8  
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 116.7   185.0  
Write-offs (9.2)   (21.3)  
Net allowance for credit losses 19.9 [1]   (47.0) [2]  
Allowance for credit losses, end of the period 127.4   116.7  
Allowance for credit losses:        
Allowance individually evaluated for impairment 0.0   0.0  
Allowance collectively evaluated for impairment 127.4   116.7  
Loans:        
Loans individually evaluated for impairment 0.0   0.0  
Loans collectively evaluated for impairment 242.7   205.8  
Specific allowance for credit losses | Retail Loans | Other Loan        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses, beginning of the period 2,082.0   1,751.0  
Write-offs (1,328.8)   (1,166.2)  
Net allowance for credit losses 2,148.4 [1]   1,497.2 [2]  
Allowance for credit losses, end of the period 2,901.6   2,082.0  
Allowance for credit losses:        
Allowance individually evaluated for impairment 0.0   0.0  
Allowance collectively evaluated for impairment 2,901.6   2,082.0  
Loans:        
Loans individually evaluated for impairment 0.0   0.0  
Loans collectively evaluated for impairment 4,653.5   3,580.5  
Specific allowance for credit losses | Wholesale loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses, beginning of the period 7,316.1   5,754.5  
Write-offs (3,480.4)   (714.5)  
Net allowance for credit losses 4,248.1 [1]   2,276.1 [2]  
Allowance for credit losses, end of the period 8,083.8   7,316.1  
Allowance for credit losses:        
Allowance individually evaluated for impairment 8,083.8   7,316.1  
Allowance collectively evaluated for impairment 0.0   0.0  
Loans:        
Loans individually evaluated for impairment 13,489.6   8,758.2  
Loans collectively evaluated for impairment 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 19,225.5   14,731.6  
Net allowance for credit losses 151.2 [1]   4,493.9 [2]  
Allowance for credit losses, end of the period 19,376.7   19,225.5  
Allowance for credit losses:        
Allowance individually evaluated for impairment 0.0   0.0  
Allowance collectively evaluated for impairment 19,376.7   19,225.5  
Loans:        
Loans individually evaluated for impairment 0.0   0.0  
Loans collectively evaluated for impairment 2,695,153.3   2,167,409.4  
Unallocated allowance for credit losses | Wholesale loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for credit losses, beginning of the period 2,738.5   2,495.7  
Net allowance for credit losses 509.9 [1]   242.8 [2]  
Allowance for credit losses, end of the period 3,248.4   2,738.5  
Allowance for credit losses:        
Allowance individually evaluated for impairment 0.0   0.0  
Allowance collectively evaluated for impairment 3,248.4   2,738.5  
Loans:        
Loans individually evaluated for impairment 0.0   0.0  
Loans collectively evaluated for impairment ₨ 1,208,971.0   ₨ 1,031,165.4  
[1] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 7,524.7 million.
[2] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 6,400.0 million.