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Portfolio of Trading Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2016 INR (₨) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 INR (₨)
--- | --- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | ₨ 71,703.4 | $ 1,082.3 | ₨ 61,239.5
Gross Unrealized Gains | 157.5 | 2.4 | 53.5
Gross Unrealized Losses | 0.0 | 0.0 | 0.2
Fair Value | 71,860.9 | $ 1,084.7 | 61,292.8
Debt Securities | Government of India securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 56,954.3 |  | 60,239.5
Gross Unrealized Gains | 41.9 |  | 53.5
Gross Unrealized Losses | 0.0 |  | 0.2
Fair Value | 56,996.2 |  | 60,292.8
Debt Securities | Other corporate/financial institution securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 14,749.1 |  | 1,000.0
Gross Unrealized Gains | 115.6 |  | 0.0
Gross Unrealized Losses | 0.0 |  | 0.0
Fair Value | ₨ 14,864.7 |  | ₨ 1,000.0

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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=66010992&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=66010992&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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