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Insurance services - Summary of Bank's Aggregate Fair Value of Assets, by Major Investment Asset Category, Supporting Separate Accounts Liabilities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
--- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | ₨ 1,016,281.4 | $ 11,896.1 | ₨ 955,416.3
Government of India securities [Member} |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 97,711.6 | 1,143.8 | 93,097.3
Other corporate/financial institution securities [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 140,430.0 | 1,643.8 | 117,615.1
Total debt securities [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 238,141.6 | 2,787.6 | 210,712.4
Other securities (including mutual fund units) [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 766,292.4 | 8,969.8 | 736,807.0
Other net current assets [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 11,847.4 | $ 138.7 | 7,896.9
UL Life [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 821,559.8 |  | 790,711.5
UL Life [Member] | Government of India securities [Member} |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 30,908.6 |  | 39,549.7
UL Life [Member] | Other corporate/financial institution securities [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 88,265.9 |  | 74,622.2
UL Life [Member] | Total debt securities [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 119,174.5 |  | 114,171.9
UL Life [Member] | Other securities (including mutual fund units) [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 697,104.6 |  | 671,814.6
UL Life [Member] | Other net current assets [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 5,280.7 |  | 4,725.0
UL Pension [Member} |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 54,738.0 |  | 55,596.3
UL Pension [Member} | Government of India securities [Member} |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 5,813.3 |  | 7,114.1
UL Pension [Member} | Other corporate/financial institution securities [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 8,133.3 |  | 8,253.7
UL Pension [Member} | Total debt securities [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 13,946.6 |  | 15,367.8
UL Pension [Member} | Other securities (including mutual fund units) [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 40,158.2 |  | 39,955.9
UL Pension [Member} | Other net current assets [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 633.2 |  | 272.6
Group Linked [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 139,983.6 |  | 109,108.5
Group Linked [Member] | Government of India securities [Member} |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 60,989.7 |  | 46,433.5
Group Linked [Member] | Other corporate/financial institution securities [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 44,030.8 |  | 34,739.2
Group Linked [Member] | Total debt securities [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 105,020.5 |  | 81,172.7
Group Linked [Member] | Other securities (including mutual fund units) [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | 29,029.6 |  | 25,036.5
Group Linked [Member] | Other net current assets [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate Account Assets | ₨ 5,933.5 |  | ₨ 2,899.3

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