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Investments Measured at Fair Value on Recurring Basis (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨)
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Trading account securities |  | ₨ 304,962.9 | $ 4,045.1 | ₨ 265,516.1
Total | $ |  |  | 49,372.4 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Trading account securities |  | 304,962.9 |  | 265,516.1
Securities Available-for-Sale |  | 3,406,289.2 |  | 2,633,348.4
Equity securities | [1] | 10,937.5 |  | 11,024.0
Total |  | 3,722,189.6 |  | 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 |  | 6,291.0 |  | 1,999.6
Securities Available-for-Sale |  | 371,450.5 |  | 34,807.2
Equity securities | [1] | 2,282.4 |  | 2,390.1
Total |  | 380,023.9 | 5,040.7 | 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 |  | 298,671.9 |  | 263,516.5
Securities Available-for-Sale |  | 2,907,384.4 |  | 2,559,728.3
Equity securities | [1] | 8,655.1 |  | 8,633.9
Total |  | 3,214,711.4 | 42,641.1 | 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 |  | 0.0
Securities Available-for-Sale |  | 127,454.3 |  | 38,812.9
Equity securities | [1] | 0.0 |  | 0.0
Total |  | ₨ 127,454.3 | $ 1,690.6 | ₨ 38,812.9
[1] | Equity securities classified within other assets.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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