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Financial Instruments and Derivatives Financial Instruments, Other Than Investment in Direct Financing Leases, Investment in Subsidiaries and Affiliates, Pension Obligations and Insurance Contracts (Parenthetical) (Detail) (Non Trading Instruments, Investment in securities, JPY ¥) In Millions, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013
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Carrying amount |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Not practicable to estimate fair value | ¥ 213,843 | [1] | ¥ 208,077 | [2]
Estimated fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Not practicable to estimate fair value | ¥ 213,843 | [1] | ¥ 208,077 | [2]
[1] | The fair value of investment securities of ¥213,843 million was not estimated, as it was not practical.
[2] | The fair value of investment securities of ¥208,077 million was not estimated, as it was not practical.

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- Definition This item represents a financial instrument (as defined) for which it is not practicable to estimate fair value. Such disclosure may be for an individual financial instrument or a class of financial instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 + Details
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