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Derivative Instruments 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] |  |  |
Derivative assets | ₨ 139,217.1 | $ 2,146.8 | ₨ 85,223.0
Derivative liabilities | 145,060.5 | $ 2,236.9 | 78,582.4
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets | 139,217.1 |  | 85,223.0
Derivative liabilities | 145,060.5 |  | 78,582.4
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] |  |  |
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 and Nonrecurring Basis [Line Items] |  |  |
Derivative assets | 139,217.1 |  | 85,223.0
Derivative liabilities | 145,060.5 |  | 78,582.4
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] |  |  |
Derivative assets | 0.0 |  | 0.0
Derivative liabilities | ₨ 0.0 |  | ₨ 0.0

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