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Information about Available-for-Sale Securities and Held-to-Maturity Securities with Gross Unrealized Losses and Length of Time Individual Securities Have Been in Continuous Unrealized Loss Position (Detail) (JPY ¥) In Millions, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013
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Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 months Fair value | ¥ 230,884 | ¥ 107,836
Less than 12 months Gross unrealized losses | (816) | (382)
12 months or more Fair value | 30,722 | 59,014
12 months or more Gross unrealized losses | (1,650) | (3,986)
Total Fair value | 261,606 | 166,850
Total Gross unrealized losses | (2,466) | (4,368)
Japanese and foreign government bond securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 months Fair value | 140,133 | 85,842
Less than 12 months Gross unrealized losses | (10) | (21)
12 months or more Fair value | 14,977 | 0
12 months or more Gross unrealized losses | (8) | 0
Total Fair value | 155,110 | 85,842
Total Gross unrealized losses | (18) | (21)
Japanese prefectural and foreign municipal bond securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 months Fair value | 31,407 | 10,118
Less than 12 months Gross unrealized losses | (143) | 0
12 months or more Fair value | 0 | 0
12 months or more Gross unrealized losses | 0 | 0
Total Fair value | 31,407 | 10,118
Total Gross unrealized losses | (143) | 0
Corporate debt securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 months Fair value | 27,496 | 4,490
Less than 12 months Gross unrealized losses | (31) | (69)
12 months or more Fair value | 10,968 | 16,329
12 months or more Gross unrealized losses | (524) | (878)
Total Fair value | 38,464 | 20,819
Total Gross unrealized losses | (555) | (947)
Specified bonds issued by SPEs in Japan |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 months Fair value | 0 | 3,929
Less than 12 months Gross unrealized losses | 0 | (106)
12 months or more Fair value | 2,138 | 34,226
12 months or more Gross unrealized losses | (148) | (925)
Total Fair value | 2,138 | 38,155
Total Gross unrealized losses | (148) | (1,031)
CMBS and RMBS in the U.S., and other asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 months Fair value | 15,891 | 2,142
Less than 12 months Gross unrealized losses | (91) | (44)
12 months or more Fair value | 2,540 | 8,141
12 months or more Gross unrealized losses | (950) | (2,164)
Total Fair value | 18,431 | 10,283
Total Gross unrealized losses | (1,041) | (2,208)
Equity securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 months Fair value | 15,957 | 1,315
Less than 12 months Gross unrealized losses | (541) | (142)
12 months or more Fair value | 99 | 318
12 months or more Gross unrealized losses | (20) | (19)
Total Fair value | 16,056 | 1,633
Total Gross unrealized losses | ¥ (561) | ¥ (161)

X
- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. + References No definition available. + Details
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