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Insurance services - Summary of Bank's Gross Premiums or Assessments and Interest Expense Recognised (Detail) - 9 months ended Mar. 31, 2024
₨ in Millions, $ in Millions
INR (₨)
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 $ 4,437.9
Interest expense 82,760.2 $ 993.0
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  
Interest expense 8,357.9  
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  
Interest expense 4.4  
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  
Interest expense 25,621.0  
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  
Interest expense 704.0  
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  
Interest expense 12,926.3  
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  
Interest expense 17.6  
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  
Interest expense 29,795.5  
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  
Interest expense 962.1  
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  
Interest expense ₨ 4,371.4