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Roll-Forwards of the Amount Related to Credit Losses on Other-Than-Temporarily Impaired Debt Securities Recognized in Earnings (Detail) In Millions	12 Months Ended
	Mar. 31, 2011 USD ($)		Mar. 31, 2011 JPY (¥)		Mar. 31, 2010 JPY (¥)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Beginning	$ 60		¥ 5,016		¥ 906
Reduction to the beginning balance	(21)	[1]	(1,810)	[1]	0	[1]
Beginning after reduction	39		3,206		0
Credit loss for which an other-than-temporary impairment was not previously recognized	88		7,292		3,744
Credit loss for which an other-than-temporary impairment was previously recognized	9		736		366
For securities sold or redeemed	(4)		(307)		0
Due to change in intent to sell or requirement to sell	(23)		(1,905)		0
Ending	$ 109		¥ 9,022		¥ 5,016
[1] Cumulative effects of adopting Accounting Standards Update 2009-16 (ASC860 ("Transfers and Servicing") (FASB Statement No. 166 ("Accounting for Transfers of Financial Assets-an amendment of FASB Statement No.140"))), and Accounting Standards Update 2009-17 (ASC810 ("Consolidation") (FASB Statement No. 167 ("Amendment of FASB Interpretation No.46(R)," ASC810-10 ("Consolidation-Variable Interest Entities")))) have been deducted from the beginning balance.

X

- Definition

This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis.

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- Definition

This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.

+ Details

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- Definition

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

+ Details

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- Definition

Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance Restated

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- Definition

Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]

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- Definition

This item represents reductions in the amount of cumulative losses recognized in earnings for other than temporary impairments (OTTI) for which a portion of the impairment had been recognized in other comprehensive income (a component of shareholders' equity) due to a change in status of the impaired security because of a change in the entity's intent to either sell the impaired security or it has become more likely than not that the entity will be required to sell the security before recovery of its cost basis.

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- Definition

Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cumulative Effect of Change in Accounting Principle

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- Definition

This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the sale of impaired securities during the period.

+ Details

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