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Summary of Significant Accounting Policies - Summary of the Table Illustrates the Impact on Allowances for Credit Losses on Adopting ASC 326 (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Apr. 01, 2020 INR (₨) | Mar. 31, 2020 INR (₨)
--- | --- | --- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans | ₨ 11,700,189.2 | $ 159,969.8 |  | ₨ 10,425,022.4
As reported under ASC 326 |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures and undrawn commitments |  |  | ₨ 5,523.4 |
Allowance for Credit Losses Other |  |  | 186.8 |
Total |  |  | 285,556.4 |
As reported under ASC 326 | Auto loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 29,099.9 |
As reported under ASC 326 | Personal loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 85,188.2 |
As reported under ASC 326 | Retail Business Banking |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 36,807.8 |
As reported under ASC 326 | Commercial vehicle and construction equipment finance |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 20,788.9 |
As reported under ASC 326 | Housing loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 3,360.2 |
As reported under ASC 326 | Other retail loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 38,098.6 |
As reported under ASC 326 | Wholesale loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 66,502.6 |
As reported under ASC 326 | Allowance for Credit Losses on Loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 279,846.2 |
As reported under ASC 326 | Allowance for Credit Losses on AFS debt securities |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Credit Losses on AFS debt securities |  |  | 0.0 |
Pre-ASC 326 adoption |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures and undrawn commitments |  |  | 3,226.8 |
Allowance for Credit Losses Other |  |  | 0.0 |
Total |  |  | 202,060.0 |
Pre-ASC 326 adoption | Auto loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 19,219.0 |
Pre-ASC 326 adoption | Personal loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 47,097.1 |
Pre-ASC 326 adoption | Retail Business Banking |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 32,860.3 |
Pre-ASC 326 adoption | Commercial vehicle and construction equipment finance |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 20,463.4 |
Pre-ASC 326 adoption | Housing loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 1,700.7 |
Pre-ASC 326 adoption | Other retail loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 37,864.3 |
Pre-ASC 326 adoption | Wholesale loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 39,628.4 |
Pre-ASC 326 adoption | Allowance for Credit Losses on Loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 198,833.2 |
Pre-ASC 326 adoption | Allowance for Credit Losses on AFS debt securities |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Credit Losses on AFS debt securities |  |  | 0.0 |
Impact of ASC 326 Adoption |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures and undrawn commitments |  |  | 2,296.6 |
Allowance for Credit Losses Other |  |  | 186.8 |
Total |  |  | 83,496.4 |
Impact of ASC 326 Adoption | Auto loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 9,880.9 |
Impact of ASC 326 Adoption | Personal loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 38,091.1 |
Impact of ASC 326 Adoption | Retail Business Banking |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 3,947.5 |
Impact of ASC 326 Adoption | Commercial vehicle and construction equipment finance |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 325.5 |
Impact of ASC 326 Adoption | Housing loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 1,659.5 |
Impact of ASC 326 Adoption | Other retail loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 234.3 |
Impact of ASC 326 Adoption | Wholesale loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 26,874.2 |
Impact of ASC 326 Adoption | Allowance for Credit Losses on Loans |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Loans |  |  | 81,013.0 |
Impact of ASC 326 Adoption | Allowance for Credit Losses on AFS debt securities |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Allowance for Credit Losses on AFS debt securities |  |  | ₨ 0.0 |

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