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Affiliated companies and other equity-method investees - Summary of Aggregate Carrying Amount and Fair Value of Investments in Affiliated Companies and Other Equity-Method Investees (Detail) (JPY ¥) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Schedule of Equity Method Investments [Line Items]
Carrying amount	¥ 322,747	¥ 172,647
Fair value	¥ 404,967	¥ 208,827

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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