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Fair Value Measurements - Additional Information (Detail) In Millions | 12 Months Ended
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Mar. 31, 2011 Available-for-sale securities USD ($) | Mar. 31, 2011 Available-for-sale securities JPY (¥) | Mar. 31, 2010 Available-for-sale securities JPY (¥) | Mar. 31, 2009 Available-for-sale securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2011 Available-for-sale securities Specified bonds issued by SPEs in Japan USD ($) | Mar. 31, 2010 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2009 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2011 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities USD ($) | Mar. 31, 2010 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2009 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2011 Specified bonds issued by SPEs in Japan Accounting Standards Update 2009-16 And 2009-17 JPY (¥) | Mar. 31, 2011 CMBS and RMBS in the U.S., and other asset-backed securities Accounting Standards Update 2009-16 And 2009-17 JPY (¥)
Fair Value, Measurement Inputs, Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers in and/or out of Level 3 (net) | $ (524) | [1] | ¥ (43,536) | [1] | ¥ 855 | [1] | ¥ 66,753 | [1] | ¥ 7,929 | [1] | $ 96 | [1] | ¥ 0 | [1] | ¥ 0 | [1] | ¥ (49,408) | [1] | $ (595) | [1] | ¥ 0 | [1] | ¥ 64,883 | [1] |  |
Transfers into Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,225 |
Transfers out of Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 1,296 | ¥ 49,408
[1] | The amount reported in "Transfers in and/or out of Level 3 (net)" is the fair value at the beginning of quarter during which the transfers occur.

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- Definition Fair Value, Measurement Inputs, Disclosure [Line Items] + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Level 3, Transfers, Into + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Level 3, Transfers, Out of + Details
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- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) + Details
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