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Insurance services - Summary of the Bank's Policyholder Account Balances on the Consolidated Balance (Detail) - Mar. 31, 2024
₨ in Millions, $ in Millions
INR (₨)
USD ($)
Disclosure Of Policyholder Account Balances [Line Items]    
Policyholder Account Balance ₨ 85,430.1 $ 1,025.1
Group Traditional Life [Member]    
Disclosure Of Policyholder Account Balances [Line Items]    
Policyholder Account Balance 23,718.6 284.6
Group Traditional Pension [Member]    
Disclosure Of Policyholder Account Balances [Line Items]    
Policyholder Account Balance 8,824.2 105.9
Group Variable Life [Member]    
Disclosure Of Policyholder Account Balances [Line Items]    
Policyholder Account Balance 22,764.1 273.1
Group Variable Pension [Member]    
Disclosure Of Policyholder Account Balances [Line Items]    
Policyholder Account Balance 19,200.9 230.4
Individual VIP pension [Member]    
Disclosure Of Policyholder Account Balances [Line Items]    
Policyholder Account Balance 9,613.9 115.4
Statutory reserves [Member]    
Disclosure Of Policyholder Account Balances [Line Items]    
Policyholder Account Balance ₨ 1,308.4 $ 15.7