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Details of Credit Derivatives Written (Detail) In Millions | 12 Months Ended
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Mar. 31, 2011 Credit default swap USD ($) | Mar. 31, 2011 Credit default swap JPY (¥) | Mar. 31, 2010 Credit default swap JPY (¥) | Mar. 31, 2011 Total return swap USD ($) | Mar. 31, 2011 Total return swap JPY (¥) | Mar. 31, 2010 Total return swap JPY (¥)
Credit Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
The events or circumstances that would require the seller to perform under the credit derivative | In case of credit event (bankruptcy, failure to pay, restructuring) occurring in underlying reference company | [1] | In case of credit event (bankruptcy, failure to pay, restructuring) occurring in underlying reference company | [1] | In case of credit event (bankruptcy, failure to pay, restructuring) occurring in underlying reference company | [1] | In case of underlying reference CMBS price falling beyond certain extent | [2] | In case of underlying reference CMBS price falling beyond certain extent | [2] | In case of underlying reference CMBS price falling beyond certain extent | [2]
Maximum potential amount of future payment under the credit derivative | $ 84 |  | ¥ 7,000 |  | ¥ 7,000 |  | $ 344 |  | ¥ 28,606 |  | ¥ 41,146 |
Approximate remaining term of the credit derivative | Less than one year |  | Less than one year |  | Less than two years |  | Less than one year |  | Less than one year |  | Less than two years |
Fair value of the credit derivative | $ 1 |  | ¥ 48 |  | ¥ (1) |  | $ (3) |  | ¥ (236) |  | ¥ 493 |
[1] | Underlying reference company's credit ratings are BBB+ or better rated by rating agencies as of March 31, 2010 and 2011.
[2] | Underlying reference CMBS is highest grade tranche and its credit rating is BBB or better rated by rating agencies as of March 31, 2010 and 2011. Unless such highest grade tranche of CMBS incurs a loss, the Company and its subsidiaries will not suffer a loss.

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- Definition Represents the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative or each group of similar credit derivatives before reduction for potential recoveries under recourse or collateralization provisions in the credit derivative. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44DD -Subparagraph b + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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- Definition Describes the approximate term of the credit derivative or each group of similar credit derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44DD -Subparagraph a + Details
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- Definition Describes the events or circumstances that would require the seller to perform under the credit derivative or each group of similar credit derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44DD -Subparagraph a + Details
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- Definition Fair value as of the balance sheet date of credit risk derivative assets, net of credit risk derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 + Details
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