Derivative instruments and hedging activities - Additional Information (Detail) - JPY (¥) ¥ in Billions	Mar. 31, 2015	Mar. 31, 2014
Derivative instruments and hedging activities
Derivative liability position with credit-risk-related contingent features	¥ 874	¥ 973
Collateral pledged for derivative instruments with credit-risk-related contingent features that are in a liability position	708	747
Additional collateral required to be posted, aggregate fair value	¥ 19	¥ 102

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624258-113959

Name:	us-gaap_AdditionalCollateralAggregateFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant