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Loan Delinquency and Non-Accrual Loans (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2017
INR (₨)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans ₨ 5,988,909.7 $ 92,350.2 ₨ 4,992,834.4
Retail Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,048,961.3 62,435.8 3,458,565.7
Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 720,657.8 11,112.7 589,010.3
Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 841,806.8 12,980.8 626,152.2
Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 913,720.2 14,089.7 791,857.3
Retail Loans | Commercial vehicle and construction equipment finance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 460,365.2 7,098.9 369,992.4
Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 383,866.9 5,919.3 318,692.0
Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 728,544.4 11,234.4 762,861.5
Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,939,948.4 29,914.4 1,534,268.7
Financing Receivable, 31 to 90 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 35,409.1 546.0 26,768.0
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,300.4   3,383.3
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,305.5   4,228.6
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 7,959.1   8,281.2
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Commercial vehicle and construction equipment finance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 6,098.3   5,146.2
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 47.6   62.2
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 11,635.5   3,842.8
Financing Receivable, 31 to 90 Days Past Due | Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,062.7   1,823.7
Impaired / 91 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 82,979.7 1,279.6 52,982.7
Impaired / 91 days or more past due | Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 6,105.6   4,494.5
Impaired / 91 days or more past due | Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 6,467.4   4,441.6
Impaired / 91 days or more past due | Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 21,060.1   15,486.0
Impaired / 91 days or more past due | Retail Loans | Commercial vehicle and construction equipment finance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 6,086.6   5,150.7
Impaired / 91 days or more past due | Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,678.2   1,068.6
Impaired / 91 days or more past due | Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 11,306.1   6,781.6
Impaired / 91 days or more past due | Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 30,275.7   15,559.7
Total current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1],[2] 5,870,520.9 $ 90,524.6 4,913,083.7
Total current | Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1],[2] 711,251.8   581,132.5
Total current | Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1],[2] 830,033.9   617,482.0
Total current | Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1],[2] 884,701.0   768,090.1
Total current | Retail Loans | Commercial vehicle and construction equipment finance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1],[2] 448,180.3   359,695.5
Total current | Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1],[2] 382,141.1   317,561.2
Total current | Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1],[2] 705,602.8   752,237.1
Total current | Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1],[2] ₨ 1,908,610.0   ₨ 1,516,885.3
[1] Includes crop related agricultural loans with days past due less than 366 as they are not considered as impaired
[2] Loans up to 30 days past due are considered current