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Allowance for Credit Losses (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2016
INR (₨)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
INR (₨)
Mar. 31, 2014
INR (₨)
Mar. 31, 2016
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, beginning of the period ₨ 47,334.1 $ 714.5 ₨ 42,613.2 ₨ 33,694.2  
Write-offs (20,218.6) (305.2) (19,804.0) (14,909.1)  
Net allowance for credit losses 30,244.6 [1] 456.5 [1] 24,524.9 [2] 23,828.1 [3]  
Allowance for credit losses, end of the period 57,360.1 $ 865.8 47,334.1 42,613.2  
Allowance for credit losses:          
Allowance individually evaluated for impairment 7,413.4   8,083.8 7,316.1 $ 111.9
Allowance collectively evaluated for impairment 49,946.7   39,250.3 35,297.1 753.9
Loans:          
Loans individually evaluated for impairment 15,559.7   13,489.6 8,758.2 234.9
Loans collectively evaluated for impairment 4,977,274.7   3,929,959.5 3,219,503.1 $ 75,128.6
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 1,226.0   796.1 556.7  
Write-offs (3,581.4)   (2,858.9) (2,150.4)  
Net allowance for credit losses 4,456.5 [1]   3,288.8 [2] 2,389.8 [3]  
Allowance for credit losses, end of the period 2,101.1   1,226.0 796.1  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 2,101.1   1,226.0 796.1  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 4,494.5   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 1,634.0   1,267.3 1,067.1  
Write-offs (8,296.6)   (7,418.1) (5,748.9)  
Net allowance for credit losses 9,301.2 [1]   7,784.8 [2] 5,949.1 [3]  
Allowance for credit losses, end of the period 2,638.6   1,634.0 1,267.3  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 2,638.6   1,634.0 1,267.3  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 4,441.6   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 7,105.6   5,598.1 5,058.2  
Write-offs (686.1)   (380.8) (93.7)  
Net allowance for credit losses 4,198.0 [1]   1,888.3 [2] 633.6 [3]  
Allowance for credit losses, end of the period 10,617.5   7,105.6 5,598.1  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 10,617.5   7,105.6 5,598.1  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 15,486.0   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 3,630.6   3,472.9 2,094.4  
Write-offs (3,065.1)   (4,327.8) (5,014.1)  
Net allowance for credit losses 3,311.2 [1]   4,485.5 [2] 6,392.6 [3]  
Allowance for credit losses, end of the period 3,876.7   3,630.6 3,472.9  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 3,876.7   3,630.6 3,472.9  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 5,150.7   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 127.4   116.7 185.0  
Write-offs (29.0)   (9.2) (21.3)  
Net allowance for credit losses 312.0 [1]   19.9 [2] (47.0) [3]  
Allowance for credit losses, end of the period 410.4   127.4 116.7  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 410.4   127.4 116.7  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 1,068.6   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 2,901.6   2,082.0 1,751.0  
Write-offs (1,818.4)   (1,328.8) (1,166.2)  
Net allowance for credit losses 2,867.2 [1]   2,148.4 [2] 1,497.2 [3]  
Allowance for credit losses, end of the period 3,950.4   2,901.6 2,082.0  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 3,950.4   2,901.6 2,082.0  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 6,781.6   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 8,083.8   7,316.1 5,754.5  
Write-offs (2,742.0)   (3,480.4) (714.5)  
Net allowance for credit losses 2,071.6 [1]   4,248.1 [2] 2,276.1 [3]  
Allowance for credit losses, end of the period 7,413.4   8,083.8 7,316.1  
Allowance for credit losses:          
Allowance individually evaluated for impairment 7,413.4   8,083.8 7,316.1  
Allowance collectively evaluated for impairment 0.0   0.0 0.0  
Loans:          
Loans individually evaluated for impairment 15,559.7   13,489.6 8,758.2  
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 19,376.7   19,225.5 14,731.6  
Net allowance for credit losses 3,171.9 [1]   151.2 [2] 4,493.9 [3]  
Allowance for credit losses, end of the period 22,548.6   19,376.7 19,225.5  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 22,548.6   19,376.7 19,225.5  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment 3,421,142.7   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 3,248.4   2,738.5 2,495.7  
Net allowance for credit losses 555.0 [1]   509.9 [2] 242.8 [3]  
Allowance for credit losses, end of the period 3,803.4   3,248.4 2,738.5  
Allowance for credit losses:          
Allowance individually evaluated for impairment 0.0   0.0 0.0  
Allowance collectively evaluated for impairment 3,803.4   3,248.4 2,738.5  
Loans:          
Loans individually evaluated for impairment 0.0   0.0 0.0  
Loans collectively evaluated for impairment ₨ 1,518,709.0   ₨ 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 8,713.3 million (US$ 131.5)
[2] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 7,524.7 million.
[3] Net allowances for credit losses charged to expense does not include the recoveries against write-off cases amounting to Rs 6,400.0 million.