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Loans - Additional Information (Detail) ₨ in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 01, 2020 INR (₨) | Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨) | Mar. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans provided as collateral for borrowings |  | ₨ 372,013.8 |  | ₨ 406,381.7 | $ 4,903.3
Purchased financing receivable outstanding |  | 836,172.8 |  | 710,194.7 |
Loans receivable restructured due to unexpected event |  | 229,800.0 | $ 3,000.0 | 138,400.0 |
Allowance for loan losses |  | 79,821.5 |  | 67,584.1 | $ 1,052.1
Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable loans available for sale debt securities off balance sheet credit exposures and others credit loss expense reversal change in method | ₨ 83,496.4 |  |  |  |
Cumulative adjustment to retained earnings | 62,480.4 |  |  |  |
Allowance for loan losses | ₨ 21,016.0 |  |  |  |
Retail Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
TDR modifications carrying value |  | 0.0 |  | 0.0 |
Loans receivable restructured due to unexpected event |  | 137,800.0 |  | 220,000.0 |
Wholesale Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable restructured due to unexpected event |  | ₨ 600.0 |  | 9,800.0 |
Crop related agricultural loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of days past due up to which loans considered current |  | 90 days | 90 days |  |
Number of past days less than to which Crop Related Agricultural loans are not considered as impaired |  | 366 days | 366 days |  |
HDB Retail Business Banking [Member] | Retail Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
TDR modifications carrying value |  | ₨ 0.0 |  | ₨ 0.0 |

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