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Loan Delinquency and Non-Accrual Loans (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans ₨ 7,376,179.0 $ 113,288.0 ₨ 5,988,909.7
Retail Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,213,364.6 80,070.2 4,048,961.3
Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 885,234.7 13,596.0 720,657.8
Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,187,127.1 18,232.6 841,806.8
Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,305,219.8 20,046.4 913,720.2
Retail Loans | Commercial vehicle and construction equipment finance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 595,813.6 9,150.9 460,365.2
Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 362,718.1 5,570.9 383,866.9
Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 877,251.3 13,473.4 728,544.4
Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,162,814.4 33,217.8 1,939,948.4
Financing Receivable, 31 to 90 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 39,461.0 606.1 35,409.1
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,384.5   3,300.4
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 8,179.1   5,305.5
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 10,522.0   7,959.1
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 7,324.9   6,098.3
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 25.9   47.6
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 8,716.0   11,635.5
Financing Receivable, 31 to 90 Days Past Due | Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 308.6   1,062.7
Impaired / 91 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 108,717.3 1,669.8 82,979.7
Impaired / 91 days or more past due | Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 8,634.5   6,105.6
Impaired / 91 days or more past due | Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 10,150.9   6,467.4
Impaired / 91 days or more past due | Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 25,547.2   21,060.1
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 6,968.1   6,086.6
Impaired / 91 days or more past due | Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,899.5   1,678.2
Impaired / 91 days or more past due | Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 22,704.3   11,306.1
Impaired / 91 days or more past due | Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 32,812.8   30,275.7
Total current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 7,228,000.7 [1] $ 111,012.1 [2] 5,870,520.9 [1],[3]
Total current | Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1] 872,215.7   711,251.8 [3]
Total current | Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1] 1,168,797.1   830,033.9 [3]
Total current | Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1] 1,269,150.6   884,701.0 [3]
Total current | Retail Loans | Commercial vehicle and construction equipment finance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1] 581,520.6   448,180.3 [3]
Total current | Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1] 360,792.7   382,141.1 [3]
Total current | Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1] 845,831.0   705,602.8 [3]
Total current | Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [1] ₨ 2,129,693.0   ₨ 1,908,610.0 [3]
[1] Loans up to 30 days past due are considered current
[2] Includes crop related agricultural loans with days past due less than 366 as they are not considered as impaired Rs. 31.5 billion.
[3] Includes crop related agricultural loans with days past due less than 366 as they are not considered as impaired Rs. 38.3 billion.