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Insurance services - Summary of the Bank's Policyholder Account Balances on the Consolidated Balance (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
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Disclosure Of Policyholder Account Balances [Line Items] |  |  |
Policyholder Account Balance | ₨ 81,652.8 | $ 955.8 | ₨ 85,430.1
Group Traditional Life [Member] |  |  |
Disclosure Of Policyholder Account Balances [Line Items] |  |  |
Policyholder Account Balance | 26,771.0 | 313.5 | 23,718.6
Group Traditional Pension [Member] |  |  |
Disclosure Of Policyholder Account Balances [Line Items] |  |  |
Policyholder Account Balance | 12,824.8 | 150.1 | 8,824.2
Group Variable Life [Member] |  |  |
Disclosure Of Policyholder Account Balances [Line Items] |  |  |
Policyholder Account Balance | 20,051.5 | 234.7 | 22,764.1
Group Variable Pension [Member] |  |  |
Disclosure Of Policyholder Account Balances [Line Items] |  |  |
Policyholder Account Balance | 13,296.2 | 155.6 | 19,200.9
Individual VIP pension [Member] |  |  |
Disclosure Of Policyholder Account Balances [Line Items] |  |  |
Policyholder Account Balance | 7,543.8 | 88.3 | 9,613.9
Statutory reserves [Member] |  |  |
Disclosure Of Policyholder Account Balances [Line Items] |  |  |
Policyholder Account Balance | ₨ 1,165.5 | $ 13.6 | ₨ 1,308.4

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