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Derivative Instruments Measured at Fair Value on Recurring Basis (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2015
INR (₨)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
INR (₨)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Derivative assets ₨ 72,415.7 $ 1,162.2 ₨ 142,479.3
Derivative liabilities 71,767.5 $ 1,151.8 124,176.3
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Derivative assets 72,415.7   142,479.3
Derivative liabilities 71,767.5   124,176.3
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 Basis [Line Items]      
Derivative assets 0.0   0.0
Derivative liabilities 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 Basis [Line Items]      
Derivative assets 72,415.7   142,479.3
Derivative liabilities 71,767.5   124,176.3
Fair Value, Measurements, Recurring | Fair Value Measurements Using Significant unobservable inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Derivative assets 0.0   0.0
Derivative liabilities ₨ 0.0   ₨ 0.0