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Information about Consolidated VIEs (Detail) (JPY ¥)
In Millions, unless otherwise specified
Dec. 31, 2011
Mar. 31, 2011
Variable Interest Entity [Line Items]    
Total assets ¥ 1,621,842 [1] ¥ 1,793,321 [1]
Total Liabilities 1,093,768 [1] 1,232,976 [1]
Assets which are pledged as collateral 1,439,248 [2] 1,575,288 [2]
Commitments 4,396 [3] 6,707 [3]
Liquidating Customer Assets
    
Variable Interest Entity [Line Items]    
Total assets 5,129 [1] 5,222 [1]
Total Liabilities 3,752 [1] 3,846 [1]
Assets which are pledged as collateral 5,129 [2] 5,222 [2]
Acquisition Of Real Estate And Real Estate Development Projects For Customers
    
Variable Interest Entity [Line Items]    
Total assets 11,470 [1] 16,051 [1]
Total Liabilities 952 [1] 4,493 [1]
Assets which are pledged as collateral   5,660 [2]
Acquisition Of Real Estate For The Company And Its Subsidiaries Real Estate Related Business
    
Variable Interest Entity [Line Items]    
Total assets 326,105 [1] 343,394 [1]
Total Liabilities 126,861 [1] 120,908 [1]
Assets which are pledged as collateral 226,803 [2] 226,319 [2]
Commitments 740 [3] 1,076 [3]
Corporate Rehabilitation Support Business
    
Variable Interest Entity [Line Items]    
Total assets 15,182 [1] 15,988 [1]
Total Liabilities 66 [1] 142 [1]
Investment in securities
    
Variable Interest Entity [Line Items]    
Total assets 76,006 [1] 83,694 [1]
Total Liabilities 13,074 [1] 13,675 [1]
Assets which are pledged as collateral 34,683 [2] 33,169 [2]
Commitments 1,483 [3] 1,491 [3]
Securitizing Financial Assets
    
Variable Interest Entity [Line Items]    
Total assets 486,238 [1] 505,421 [1]
Total Liabilities 323,095 [1] 352,034 [1]
Assets which are pledged as collateral 486,238 [2] 505,421 [2]
Securitization Of Commercial Mortgage Loans Originated By Third Parties
    
Variable Interest Entity [Line Items]    
Total assets 558,342 [1] 669,375 [1]
Total Liabilities 564,729 [1] 671,349 [1]
Assets which are pledged as collateral 558,333 [2] 660,237 [2]
Other
    
Variable Interest Entity [Line Items]    
Total assets 143,370 [1] 154,176 [1]
Total Liabilities 61,239 [1] 66,529 [1]
Assets which are pledged as collateral 128,062 [2] 139,260 [2]
Commitments ¥ 2,173 [3] ¥ 4,140 [3]
[1] The assets of many 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.