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Portfolio of Trading Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
--- | --- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | ₨ 35,337.2 | $ 544.9 | ₨ 71,703.4
Gross Unrealized Gains | 43.6 | 0.7 | 157.5
Gross Unrealized Losses | 17.1 | 0.3 | 0.0
Fair Value | 35,363.7 | $ 545.3 | 71,860.9
Debt Securities | Government of India securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 18,230.8 |  | 56,954.3
Gross Unrealized Gains | 38.5 |  | 41.9
Gross Unrealized Losses | 1.5 |  | 0.0
Fair Value | 18,267.8 |  | 56,996.2
Debt Securities | Other corporate/financial institution securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 17,106.4 |  | 14,749.1
Gross Unrealized Gains | 5.1 |  | 115.6
Gross Unrealized Losses | 15.6 |  | 0.0
Fair Value | ₨ 17,095.9 |  | ₨ 14,864.7

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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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