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Loans by Facility (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨) | Mar. 31, 2018 INR (₨)
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | ₨ 12,043,717.9 | $ 164,666.7 | ₨ 10,623,855.6 |  |  |
Less: Allowance for credit losses | 343,528.7 | 4,696.9 | 198,833.2 | $ 2,718.7 | ₨ 148,232.0 | ₨ 112,507.2
Total | 11,700,189.2 | 159,969.8 | 10,425,022.4 |  |  |
Auto loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | 39,396.1 |  | 19,219.0 |  |  |
Personal loans/Credit card |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | 110,081.0 |  | 47,097.1 |  |  |
Retail Business Banking |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | 42,288.4 |  | 32,860.3 |  |  |
Commercial vehicle and construction equipment finance |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | 26,356.7 |  | 20,463.4 |  |  |
Housing loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | 4,578.0 |  | 1,700.7 |  |  |
Other Retail |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | 49,229.2 |  | 37,864.3 |  |  |
Retail Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 7,828,832.6 | 107,039.0 | 7,040,800.4 |  |  |
Retail Loans | Auto loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 964,053.2 | 13,180.9 | 952,053.1 |  |  |
Retail Loans | Personal loans/Credit card |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 2,042,727.2 | 27,929.0 | 1,920,601.6 |  |  |
Retail Loans | Retail Business Banking |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 2,007,845.9 | 27,452.1 | 1,658,770.3 |  |  |
Retail Loans | Commercial vehicle and construction equipment finance |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 805,329.8 | 11,010.8 | 747,382.4 |  |  |
Retail Loans | Housing loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 702,235.5 | 9,601.3 | 634,612.4 |  |  |
Retail Loans | Other Retail |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 1,306,641.0 | 17,864.9 | 1,127,380.6 |  |  |
Wholesale loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 4,214,885.3 | $ 57,627.7 | 3,583,055.2 |  |  |
Less: Allowance for credit losses | ₨ 71,599.3 |  | ₨ 39,628.4 |  |  |

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