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Non-trading securities - Fair Value of Residual contractual Maturity of Non-trading Securities (Detail) (Insurance subsidiary [Member], JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2013
Insurance subsidiary [Member]
 
Non-trading debt securities [Line Items]  
Total ¥ 237,214
Less than 1 year 36,906
1 to 5 years 84,878
5 to 10 years 98,199
More than 10 years ¥ 17,231