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Financing Receivable, Allowance for Credit Loss on adopting ASC 326 (Detail) ₨ in Millions, $ in Millions | Apr. 01, 2020 INR (₨) | Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨) | Mar. 31, 2019 INR (₨)
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Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  | ₨ 372,671.8 | $ 4,911.9 | ₨ 343,528.7 | $ 4,527.9 | ₨ 198,833.2 | ₨ 148,232.0
Allowance for Credit Losses on AFS debt securities |  | 0.0 | $ 0.0 | 2,915.1 | $ 38.4 | 0.0 |
Auto mobile Loan |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 41,769.4 |  | 39,396.1 |  | 19,219.0 |
Personal Loans and Credit Card Financing Receivable [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 111,566.4 |  | 110,081.0 |  | 47,097.1 |
Retail Business Banking |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 49,055.0 |  | 42,288.4 |  | 32,860.3 |
Commercial Vehicle and Construction Equipment Finance [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 31,750.9 |  | 26,356.7 |  | 20,463.4 |
Home Equity Loan [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 2,692.2 |  | 4,578.0 |  | 1,700.7 |
Other Retail |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  | ₨ 61,437.0 |  | ₨ 49,229.2 |  | ₨ 37,864.3 |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
As reported under ASC 326 Total | ₨ 285,556.4 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Auto loans |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Notes Receivable Gross | 279,846.2 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | AFS debt securities [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Allowance for Credit Losses on AFS debt securities | 0.0 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Off Balance Sheet Credit Exposures and undrawn commitments [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Allowance for Credit Losses on Off-Balance Sheet Credit Exposures and undrawn commitments | 5,523.4 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Credit Losses Other [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Allowance for Credit Losses Other | 186.8 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Auto mobile Loan |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Notes Receivable Gross | 29,099.9 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Personal Loans and Credit Card Financing Receivable [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Notes Receivable Gross | 85,188.2 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Retail Business Banking |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Notes Receivable Gross | 36,807.8 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Commercial Vehicle and Construction Equipment Finance [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Notes Receivable Gross | 20,788.9 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Home Equity Loan [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Notes Receivable Gross | 3,360.2 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Other Retail |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Notes Receivable Gross | 38,098.6 |  |  |  |  |  |
As reported under ASC 326 | Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Notes Receivable Gross | 66,502.6 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 202,060.0 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Auto loans |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 198,833.2 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | AFS debt securities [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 0.0 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Off Balance Sheet Credit Exposures and undrawn commitments [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 3,226.8 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Credit Losses Other [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 0.0 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Auto mobile Loan |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 19,219.0 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Personal Loans and Credit Card Financing Receivable [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 47,097.1 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Retail Business Banking |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 32,860.3 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Commercial Vehicle and Construction Equipment Finance [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 20,463.4 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Home Equity Loan [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 1,700.7 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Other Retail |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 37,864.3 |  |  |  |  |  |
Pre-ASC 326 adoption | Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 39,628.4 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Impact of ASC 326 adoption Total | 83,496.4 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Auto loans |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | 81,013.0 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | AFS debt securities [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Impact of Allowance for Credit Losses on AFS debt securities | 0.0 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Off Balance Sheet Credit Exposures and undrawn commitments [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Impact of Allowance for Credit Losses on Off-Balance Sheet Credit Exposures and undrawn commitments | 2,296.6 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Credit Losses Other [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Impact of Allowance for Credit Losses Other | 186.8 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Auto mobile Loan |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | 9,880.9 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Personal Loans and Credit Card Financing Receivable [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | 38,091.1 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Retail Business Banking |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | 3,947.5 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Commercial Vehicle and Construction Equipment Finance [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | 325.5 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Home Equity Loan [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | 1,659.5 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Other Retail |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | 234.3 |  |  |  |  |  |
Impact of ASC 326 Adoption | Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss on adopting ASC 326 [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | ₨ 26,874.2 |  |  |  |  |  |

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