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Securitizations and Variable Interest Entities - Fair Value of Firm's Retained Interests and Sensitivity of This Fair Value (Parenthetical) (Detail) (JPY ¥) In Billions, unless otherwise specified							12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Material retained interest held [Domain]	Mar. 31, 2012 Material retained interest held [Domain]	Mar. 31, 2013 Material retained interests held [Member]	Mar. 31, 2012 Material retained interests held [Member]	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Minimum [Member] Material retained interest held [Domain]	Jan. 31, 2013 Minimum [Member] Material retained interest held [Domain]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2013 Maximum [Member] Material retained interest held [Domain]	Jan. 31, 2013 Maximum [Member] Material retained interest held [Domain]
Variable Interest Entity [Line Items]
Percentage of changes in fair value based on adverse effect							10.00%	10.00%	10.00%	20.00%	20.00%	20.00%
Sensitivity analysis for material retained interest					¥ 288	¥ 157
Retained interests	¥ 300	¥ 165	¥ 0	¥ 165	¥ 300	¥ 165

The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips.

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