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Loan Delinquency and Non-Accrual Loans (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans ₨ 9,111,464.6 $ 131,744.7 ₨ 7,376,179.0
Retail Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 6,237,903.6 90,195.1 5,213,364.6
Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 951,744.2 13,761.5 885,234.7
Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,538,107.4 22,239.8 1,187,127.1
Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,478,317.8 21,375.3 1,305,219.8
Retail Loans | Commercial vehicle and construction equipment finance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 746,288.0 10,790.7 595,813.6
Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 513,771.6 7,428.7 362,718.1
Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,009,674.6 14,599.1 877,251.3
Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,873,561.0 41,549.6 2,162,814.4
Financing Receivable, 31 to 90 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 44,346.7 641.2 39,461.0
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,807.0   4,384.5
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 11,520.2   8,179.1
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 9,087.9   10,522.0
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 9,225.0   7,324.9
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 23.6   25.9
Financing Receivable, 31 to 90 Days Past Due | Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 9,480.1   8,716.0
Financing Receivable, 31 to 90 Days Past Due | Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 202.9   308.6
Impaired / 91 days or more past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 140,422.5 2,030.4 108,717.3
Impaired / 91 days or more past due | Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 13,606.7   8,634.5
Impaired / 91 days or more past due | Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 15,781.5   10,150.9
Impaired / 91 days or more past due | Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 29,945.0   25,547.2
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 11,254.9   6,968.1
Impaired / 91 days or more past due | Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,157.1   1,899.5
Impaired / 91 days or more past due | Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 29,523.6   22,704.3
Impaired / 91 days or more past due | Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 38,153.7   32,812.8
Total current      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 8,926,695.4 [1],[2] $ 129,073.1 [1],[3] 7,228,000.7 [2],[3]
Total current | Retail Loans | Auto loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [2] 933,330.5 [1]   872,215.7 [3]
Total current | Retail Loans | Personal loans/Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [2] 1,510,805.7 [1]   1,168,797.1 [3]
Total current | Retail Loans | Retail Business Banking      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [2] 1,439,284.9 [1]   1,269,150.6 [3]
Total current | Retail Loans | Commercial vehicle and construction equipment finance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [2] 725,808.1 [1]   581,520.6 [3]
Total current | Retail Loans | Housing loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [2] 511,590.9 [1]   360,792.7 [3]
Total current | Retail Loans | Other Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [2] 970,670.9 [1]   845,831.0 [3]
Total current | Wholesale loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans [2] ₨ 2,835,204.4 [1]   ₨ 2,129,693.0 [3]
[1] Includes crop related agricultural loans with days past due less than 366 as they are not considered as impaired Rs. 34.0 billion.
[2] Loans up to 30 days past due are considered current
[3] Includes crop related agricultural loans with days past due less than 366 as they are not considered as impaired Rs. 31.5 billion.