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Portfolio of Trading Securities (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨)
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | ₨ 304,311.2 | $ 4,036.5 | ₨ 265,011.1
Gross Unrealized Gains | 701.4 | 9.3 | 506.2
Gross Unrealized Losses | 49.7 | 0.7 | 1.2
Fair Value | 304,962.9 | $ 4,045.1 | 265,516.1
Debt Securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 211,627.3 |  | 168,075.5
Gross Unrealized Gains | 600.0 |  | 179.0
Gross Unrealized Losses | 49.7 |  | 1.2
Fair Value | 212,177.6 |  | 168,253.3
Debt Securities | Government of India securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 207,131.4 |  | 134,084.9
Gross Unrealized Gains | 592.9 |  | 163.2
Gross Unrealized Losses | 17.2 |  | 0.1
Fair Value | 207,707.1 |  | 134,248.0
Debt Securities | Other corporate/financial institution securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 4,495.9 |  | 33,990.6
Gross Unrealized Gains | 7.1 |  | 15.8
Gross Unrealized Losses | 32.5 |  | 1.1
Fair Value | 4,470.5 |  | 34,005.3
Other securities (including mutual fund units) |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 92,683.9 |  | 96,935.6
Gross Unrealized Gains | 101.4 |  | 327.2
Gross Unrealized Losses | 0.0 |  | 0.0
Fair Value | ₨ 92,785.3 |  | ₨ 97,262.8

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in trading securities impacting investments. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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