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Information about Consolidated VIEs (Detail) (JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Variable Interest Entity [Line Items]    
Total assets ¥ 813,240 [1] ¥ 1,400,457 [1]
Total Liabilities 428,947 [1] 845,268 [1]
Assets which are pledged as collateral 605,307 [2] 1,124,911 [2]
Commitments 29,756 [3] 0 [3]
Liquidating Customer Assets
    
Variable Interest Entity [Line Items]    
Total assets 0 [1] 6,191 [1]
Total Liabilities 0 [1] 3,880 [1]
Assets which are pledged as collateral 0 [2] 6,191 [2]
Commitments 0 [3] 0 [3]
Acquisition Of Real Estate And Real Estate Development Projects For Customers
    
Variable Interest Entity [Line Items]    
Total assets 4,800 [1] 20,081 [1]
Total Liabilities 986 [1] 2,112 [1]
Assets which are pledged as collateral 0 [2] 0 [2]
Commitments 0 [3] 0 [3]
Acquisition Of Real Estate For The Company And Its Subsidiaries Real Estate Related Business
    
Variable Interest Entity [Line Items]    
Total assets 288,392 [1] 334,179 [1]
Total Liabilities 96,591 [1] 96,758 [1]
Assets which are pledged as collateral 201,427 [2] 197,143 [2]
Commitments 0 [3] 0 [3]
Corporate Rehabilitation Support Business
    
Variable Interest Entity [Line Items]    
Total assets 6,925 [1] 10,205 [1]
Total Liabilities 309 [1] 192 [1]
Assets which are pledged as collateral 0 [2] 0 [2]
Commitments 0 [3] 0 [3]
Investment in securities
    
Variable Interest Entity [Line Items]    
Total assets 23,449 [1] 34,091 [1]
Total Liabilities 9,405 [1] 8,075 [1]
Assets which are pledged as collateral 13,767 [2] 19,133 [2]
Commitments 0 [3] 0 [3]
Securitizing Financial Assets
    
Variable Interest Entity [Line Items]    
Total assets 303,154 [1] 467,348 [1]
Total Liabilities 188,463 [1] 250,374 [1]
Assets which are pledged as collateral 239,072 [2] 391,664 [2]
Commitments 0 [3] 0 [3]
Securitization Of Commercial Mortgage Loans Originated By Third Parties
    
Variable Interest Entity [Line Items]    
Total assets 64,026 [1] 425,017 [1]
Total Liabilities 67,251 [1] 434,273 [1]
Assets which are pledged as collateral 64,026 [2] 425,017 [2]
Commitments 0 [3] 0 [3]
Other
    
Variable Interest Entity [Line Items]    
Total assets 122,494 [1] 103,345 [1]
Total Liabilities 65,942 [1] 49,604 [1]
Assets which are pledged as collateral 87,015 [2] 85,763 [2]
Commitments ¥ 29,756 [3] ¥ 0 [3]
[1] The assets of most VIEs are used only to repay the liabilities of the VIEs, and the creditors of the liabilities of the VIEs have no recourse to other assets of the Company and its subsidiaries.
[2] The assets are pledged as collateral by VIE for financing of the VIE.
[3] This item represents remaining balance of commitments that could require the Company and its subsidiaries to provide investments or loans to the VIE.