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Investments Measured at Fair Value on Recurring Basis (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2017
INR (₨)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
INR (₨)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities ₨ 35,363.7 $ 545.3 ₨ 71,860.9
Securities Available-for-Sale 2,111,385.6 32,558.0 1,878,684.4
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 4.8   4,850.7
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 35,358.9   67,010.2
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 0.0   0.0
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account securities 35,363.7   71,860.9
Securities Available-for-Sale 2,110,677.4   1,877,975.6
Investments 2,146,041.1 33,092.4 1,949,836.5
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 4.8   4,850.7
Securities Available-for-Sale 8,198.7   44,045.7
Investments 8,203.5 126.5 48,896.4
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 35,358.9   67,010.2
Securities Available-for-Sale 2,080,579.6   1,816,921.8
Investments 2,115,938.5 32,628.2 1,883,932.0
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 0.0   0.0
Securities Available-for-Sale 21,899.1   17,008.1
Investments ₨ 21,899.1 $ 337.7 ₨ 17,008.1