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Investments Measured at Fair Value on Recurring Basis (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Trading account securities |  | ₨ 265,516.1 | $ 3,839.2 | ₨ 167,513.9
Securities Available-for-Sale |  |  |  | 2,221,443.3
Equity securities | [1],[2] |  |  | 559.3
Total |  |  | 42,074.7 | 2,389,516.5
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 |  |  |  | 3,652.4
Securities Available-for-Sale |  |  |  | 4,009.7
Equity securities | [1],[2] |  |  | 559.3
Total |  |  | 566.7 | 8,221.4
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 |  |  |  | 163,861.5
Securities Available-for-Sale |  |  |  | 2,198,899.0
Equity securities | [1],[2] |  |  | 0.0
Total |  |  | 40,946.8 | 2,362,760.5
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
Securities Available-for-Sale |  |  |  | 18,534.6
Equity securities | [1],[2] |  |  | 0.0
Total |  |  | $ 561.2 | ₨ 18,534.6
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Trading account securities |  | 265,516.1 |  |
Securities Available-for-Sale |  | 2,633,348.4 |  |
Equity securities | [1],[2] | 11,024.0 |  |
Total |  | 2,909,888.5 |  |
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 |  | 1,999.6 |  |
Securities Available-for-Sale |  | 34,807.2 |  |
Equity securities | [1],[2] | 2,390.1 |  |
Total |  | 39,196.9 |  |
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 |  | 263,516.5 |  |
Securities Available-for-Sale |  | 2,559,728.3 |  |
Equity securities | [1],[2] | 8,633.9 |  |
Total |  | 2,831,878.7 |  |
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 |  |
Securities Available-for-Sale |  | 38,812.9 |  |
Equity securities | [1],[2] | 0.0 |  |
Total |  | ₨ 38,812.9 |  |
[1] | Effective April 1, 2018, the Bank adopted ASU 2016-01 (See note 2(w)(ii) to the Consolidated Financial Statements for additional details).
[2] | Equity securities classified within other assets.

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