v3.25.2
Fair value measurement - Investments Measured at Fair Value on Recurring Basis (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities ₨ 625,388.5 $ 7,320.5 ₨ 461,245.3
Securities Available-for-Sale 9,910,174.3 116,003.4 8,295,487.1
Separate Account Assets 1,016,281.4 11,896.1 955,416.3
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 340,388.3   290,951.1
Securities Available-for-Sale 1,435,936.3   548,944.7
Separate Account Assets 873,154.4   808,309.4
Fair Value Measurements Using Significant other observable inputs (Level 2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 250,009.3   148,296.2
Securities Available-for-Sale 8,360,598.8   7,608,007.7
Separate Account Assets 143,127.0   147,106.9
Fair Value Measurements Using Significant unobservable inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 34,990.9   21,998.0
Securities Available-for-Sale 113,639.2   138,534.7
Separate Account Assets 0.0   0.0
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 625,388.5   461,245.3
Securities Available-for-Sale 9,910,174.3   8,295,487.1
Equity securities [1] 129,984.8   71,449.1
Separate Account Assets 1,016,281.4   955,416.3
Total 11,681,829.0 136,741.5 9,783,597.8
Liabilities on policies in force 482.9   237.2
Total 482.9 5.7 237.2
Fair Value, Measurements, Recurring | Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 336,658.0   290,951.1
Securities Available-for-Sale 1,435,936.2   548,944.7
Equity securities [1] 20,404.1   24,545.8
Separate Account Assets 873,154.4   808,309.4
Total 2,666,152.7 31,208.6 1,672,751.0
Liabilities on policies in force 0.0   0.0
Total 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Significant other observable inputs (Level 2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 253,739.6   148,296.2
Securities Available-for-Sale 8,360,598.9   7,608,007.7
Equity securities [1] 109,013.3   46,571.0
Separate Account Assets 143,127.0   147,106.9
Total 8,866,478.8 103,786.5 7,949,981.8
Liabilities on policies in force 482.9   237.2
Total 482.9 5.7 237.2
Fair Value, Measurements, Recurring | Fair Value Measurements Using Significant unobservable inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 34,990.9   21,998.0
Securities Available-for-Sale 113,639.2   138,534.7
Equity securities [1] 567.4   332.3
Separate Account Assets 0.0   0.0
Total 149,197.5 1,746.4 160,865.0
Liabilities on policies in force 0.0   0.0
Total ₨ 0.0 ₨ 0.0
[1] Equity securities classified within other assets.