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Investment in Securities (Detail) (JPY ¥) In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Schedule of Investments [Line Items]
Trading securities	¥ 16,079	¥ 33,041
Available-for-sale securities	881,606	757,299
Held-to-maturity securities	96,731	89,451
Other securities	220,160	213,877
Total	¥ 1,214,576	¥ 1,093,668

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Other investments not otherwise specified in the taxonomy.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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