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Insurance services - Summary of Bank's Gross Premiums or Assessments and Interest Expense Recognised (Detail) ₨ in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
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Mar. 31, 2024 INR (₨) | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($)
Disclosure In Tabular Form Of Gross Premium And Interest Expenses On Long Duration Insurance Contracts [Line Items] |  |  |
Gross premiums or assessments | ₨ 369,852.0 | ₨ 482,963.3 | $ 5,653.3
Interest expense | 82,760.2 | 121,493.8 | $ 1,422.1
Non Par Protection [Member] |  |  |
Disclosure In Tabular Form Of Gross Premium And Interest Expenses On Long Duration Insurance Contracts [Line Items] |  |  |
Gross premiums or assessments | 120,828.1 | 34,038.8 |
Interest expense | 8,357.9 | 6,225.7 |
Non Par Riders [Member] |  |  |
Disclosure In Tabular Form Of Gross Premium And Interest Expenses On Long Duration Insurance Contracts [Line Items] |  |  |
Gross premiums or assessments | 0.0 | 185.9 |
Interest expense | 4.4 | 18.5 |
Non Par Savings [Member] |  |  |
Disclosure In Tabular Form Of Gross Premium And Interest Expenses On Long Duration Insurance Contracts [Line Items] |  |  |
Gross premiums or assessments | 23,560.0 | 167,044.3 |
Interest expense | 25,621.0 | 43,233.8 |
Non Par Pension [Member] |  |  |
Disclosure In Tabular Form Of Gross Premium And Interest Expenses On Long Duration Insurance Contracts [Line Items] |  |  |
Gross premiums or assessments | 1,020.9 | 2,270.0 |
Interest expense | 704.0 | 870.2 |
Individual Annuity [Member] |  |  |
Disclosure In Tabular Form Of Gross Premium And Interest Expenses On Long Duration Insurance Contracts [Line Items] |  |  |
Gross premiums or assessments | 39,984.9 | 53,613.4 |
Interest expense | 12,926.3 | 20,632.5 |
Individual Health [Member] |  |  |
Disclosure In Tabular Form Of Gross Premium And Interest Expenses On Long Duration Insurance Contracts [Line Items] |  |  |
Gross premiums or assessments | 419.0 | 470.1 |
Interest expense | 17.6 | 15.2 |
Par Life [Member] |  |  |
Disclosure In Tabular Form Of Gross Premium And Interest Expenses On Long Duration Insurance Contracts [Line Items] |  |  |
Gross premiums or assessments | 111,036.4 | 137,161.4 |
Interest expense | 29,795.5 | 42,018.3 |
Par Pension [Member] |  |  |
Disclosure In Tabular Form Of Gross Premium And Interest Expenses On Long Duration Insurance Contracts [Line Items] |  |  |
Gross premiums or assessments | 1,846.5 | 3,009.7 |
Interest expense | 962.1 | 1,149.7 |
Group Non par Life [Member] |  |  |
Disclosure In Tabular Form Of Gross Premium And Interest Expenses On Long Duration Insurance Contracts [Line Items] |  |  |
Gross premiums or assessments | 71,156.2 | 85,169.7 |
Interest expense | ₨ 4,371.4 | ₨ 7,329.9 |

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- Definition Amount of gross premium income recognized for present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 + Details
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