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Derivative instruments and hedging activities - Concentration of Exposures to Credit Risk in OTC Derivatives (Detail) (JPY ¥) In Billions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Derivative [Line Items]
Gross fair value of derivative assets, Financial institutions	¥ 27,575	¥ 23,752
OTC derivatives with financial institutions [Member]
Derivative [Line Items]
Gross fair value of derivative assets, Financial institutions	20,169	18,881
Impact of master netting agreements, Financial institutions	(18,415)	(17,553)
Impact of collateral, Financial institutions	(981)	(797)
Net exposure to credit risk, Financial institutions	¥ 773	¥ 531

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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