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Non-trading securities - Fair Value of Residual contractual Maturity of Non-trading Securities (Detail) - Insurance subsidiary [Member]
¥ in Millions
Sep. 30, 2015
JPY (¥)
Non-trading debt securities [Line Items]  
Total ¥ 275,326
Less than 1 year 22,293
1 to 5 years 146,662
5 to 10 years 77,315
More than 10 years ¥ 29,056