v3.25.2
Investments, held for trading - Portfolio of Trading Securities (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amortized Cost ₨ 548,835.8 $ 6,424.4 ₨ 392,828.3
Gross Unrealized Gains 88,300.1 1,033.6 76,054.3
Gross Unrealized Losses 11,747.4 137.5 7,637.3
Fair Value 625,388.5 $ 7,320.5 461,245.3
Debt Securities      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amortized Cost 247,848.8   103,506.9
Gross Unrealized Gains 392.1   136.1
Gross Unrealized Losses 207.6   205.0
Fair Value 248,033.3   103,438.0
Debt Securities | Government of India securities      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amortized Cost 156,198.9   71,673.0
Gross Unrealized Gains 215.3   58.8
Gross Unrealized Losses 8.2   0.0
Fair Value 156,406.0   71,731.8
Debt Securities | Other corporate/financial institution securities      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amortized Cost 91,649.9   31,833.9
Gross Unrealized Gains 176.8   77.3
Gross Unrealized Losses 199.4   205.0
Fair Value 91,627.3   31,706.2
Other securities (including mutual fund units)      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amortized Cost 300,987.0   289,321.4
Gross Unrealized Gains 87,908.0   75,918.2
Gross Unrealized Losses 11,539.8   7,432.3
Fair Value ₨ 377,355.2   ₨ 357,807.3