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Information about Non Consolidated VIEs (Detail) In Millions | Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2011 Liquidating Customer Assets USD ($) | Mar. 31, 2011 Liquidating Customer Assets JPY (¥) | Mar. 31, 2010 Liquidating Customer Assets JPY (¥) | Mar. 31, 2011 Acquisition Of Real Estate And Real Estate Development Projects For Customers USD ($) | Mar. 31, 2011 Acquisition Of Real Estate And Real Estate Development Projects For Customers JPY (¥) | Mar. 31, 2010 Acquisition Of Real Estate And Real Estate Development Projects For Customers JPY (¥) | Mar. 31, 2011 Acquisition Of Real Estate For The Company And Its Subsidiaries Real Estate Related Business USD ($) | Mar. 31, 2010 Acquisition Of Real Estate For The Company And Its Subsidiaries Real Estate Related Business JPY (¥) | Mar. 31, 2011 Corporate Rehabilitation Support Business USD ($) | Mar. 31, 2010 Corporate Rehabilitation Support Business JPY (¥) | Mar. 31, 2011 Investment in securities USD ($) | Mar. 31, 2011 Investment in securities JPY (¥) | Mar. 31, 2010 Investment in securities JPY (¥) | Mar. 31, 2011 Securitizing Financial Assets USD ($) | Mar. 31, 2010 Securitizing Financial Assets JPY (¥) | Mar. 31, 2011 Securitization Of Commercial Mortgage Loans Originated By Third Parties USD ($) | Mar. 31, 2011 Securitization Of Commercial Mortgage Loans Originated By Third Parties JPY (¥) | Mar. 31, 2010 Securitization Of Commercial Mortgage Loans Originated By Third Parties JPY (¥) | Mar. 31, 2011 Other USD ($) | Mar. 31, 2011 Other JPY (¥) | Mar. 31, 2010 Other JPY (¥)
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Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 59,155 |  | ¥ 4,918,774 |  | ¥ 703,457 | [1] | $ 802 |  | ¥ 66,710 |  | ¥ 80,585 | [1] | $ 13,111 |  | ¥ 1,090,147 |  | ¥ 622,872 | [1] | $ 0 |  | ¥ 0 | [1] | $ 0 |  | ¥ 0 | [1] | $ 13,747 |  | ¥ 1,143,069 |  | ¥ 0 | [1] | $ 0 |  | ¥ 0 | [1] | $ 30,487 |  | ¥ 2,535,037 |  | ¥ 0 | [1] | $ 1,008 |  | ¥ 83,811 |  | ¥ 0 | [1]
Specified bonds and non-recourse loans | 2,167 |  | 180,150 |  | 19,863 | [1] | 13 |  | 1,073 |  | 2,540 | [1] | 2,097 |  | 174,380 |  | 17,323 | [1] | 0 |  | 0 | [1] | 0 |  | 0 | [1] | 0 |  | 0 |  | 0 | [1] | 0 |  | 0 | [1] | 48 |  | 4,000 |  | 0 | [1] | 9 |  | 697 |  | 0 | [1]
Investments | 1,333 |  | 110,803 |  | 51,933 | [1] | 84 |  | 6,979 |  | 10,075 | [1] | 635 |  | 52,850 |  | 41,858 | [1] | 0 |  | 0 | [1] | 0 |  | 0 | [1] | 269 |  | 22,349 |  | 0 | [1] | 0 |  | 0 | [1] | 307 |  | 25,493 |  | 0 | [1] | 38 |  | 3,132 |  | 0 | [1]
Maximum exposure to loss | $ 4,108 | [2] | ¥ 341,581 | [2] | ¥ 119,084 | [1],[2] | $ 97 | [2] | ¥ 8,052 | [2] | ¥ 12,615 | [1],[2] | $ 3,138 | [2] | ¥ 260,935 | [2] | ¥ 106,469 | [1],[2] | $ 0 | [2] | ¥ 0 | [1],[2] | $ 0 | [2] | ¥ 0 | [1],[2] | $ 449 | [2] | ¥ 37,287 | [2] | ¥ 0 | [1],[2] | $ 0 | [2] | ¥ 0 | [1],[2] | $ 378 | [2] | ¥ 31,478 | [2] | ¥ 0 | [1],[2] | $ 46 | [2] | ¥ 3,829 | [2] | ¥ 0 | [1],[2]
[1] | Until March 31, 2010, the Company and its subsidiaries had made disclosures according to ASC810-10 before amendment.
[2] | Maximum exposure to loss includes remaining balance of commitments that could require the Company and its subsidiaries to provide investments or loans to the VIE.

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