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Impaired Loans Where Bank is Probable that it will not Collect all Amounts due According to Original Contractual Terms of Loans (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
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Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨) | Mar. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | ₨ 108,717.3 |  | ₨ 82,979.7 | $ 1,669.8
Unpaid principal balance | 108,717.3 |  | 82,979.7 | 1,669.8
Related specific allowance | 62,600.5 |  | 45,730.1 | 961.5
Average recorded investments | 95,848.8 | $ 1,472.1 | 67,981.4 |
Finance receivable on non-accrual status | 108,717.3 |  | 82,979.7 | $ 1,669.8
Retail Loans | Auto loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 8,634.5 |  | 6,105.6 |
Unpaid principal balance | 8,634.5 |  | 6,105.6 |
Related specific allowance | 3,682.2 |  | 2,792.9 |
Average recorded investments | 7,370.1 |  | 5,300.1 |
Finance receivable on non-accrual status | 8,634.5 |  | 6,105.6 |
Retail Loans | Personal loans/Credit card |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 10,150.9 |  | 6,467.4 |
Unpaid principal balance | 10,150.9 |  | 6,467.4 |
Related specific allowance | 6,182.6 |  | 4,040.0 |
Average recorded investments | 8,309.2 |  | 5,454.5 |
Finance receivable on non-accrual status | 10,150.9 |  | 6,467.4 |
Retail Loans | Retail Business Banking |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 25,547.2 |  | 21,060.1 |
Unpaid principal balance | 25,547.2 |  | 21,060.1 |
Related specific allowance | 18,709.4 |  | 15,278.4 |
Average recorded investments | 23,303.7 |  | 18,273.1 |
Finance receivable on non-accrual status | 25,547.2 |  | 21,060.1 |
Retail Loans | Commercial vehicle and construction equipment finance |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 6,968.1 |  | 6,086.6 |
Unpaid principal balance | 6,968.1 |  | 6,086.6 |
Related specific allowance | 4,806.1 |  | 4,398.5 |
Average recorded investments | 6,527.4 |  | 5,618.7 |
Finance receivable on non-accrual status | 6,968.1 |  | 6,086.6 |
Retail Loans | Housing loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 1,899.5 |  | 1,678.2 |
Unpaid principal balance | 1,899.5 |  | 1,678.2 |
Related specific allowance | 974.4 |  | 739.3 |
Average recorded investments | 1,788.9 |  | 1,373.4 |
Finance receivable on non-accrual status | 1,899.5 |  | 1,678.2 |
Retail Loans | Other Retail |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 22,704.3 |  | 11,306.1 |
Unpaid principal balance | 22,704.3 |  | 11,306.1 |
Related specific allowance | 12,922.8 |  | 6,767.5 |
Average recorded investments | 17,005.2 |  | 9,043.9 |
Finance receivable on non-accrual status | 22,704.3 |  | 11,306.1 |
Wholesale loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 32,812.8 |  | 30,275.7 |
Unpaid principal balance | 32,812.8 |  | 30,275.7 |
Related specific allowance | 15,323.0 |  | 11,713.5 |
Average recorded investments | 31,544.3 |  | 22,917.7 |
Finance receivable on non-accrual status | ₨ 32,812.8 |  | ₨ 30,275.7 |

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