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Commitments Guarantees and Contingent Liabilities - Additional Information (Detail) In Millions	12 Months Ended
	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)	Mar. 31, 2009 JPY (¥)	Mar. 31, 2011 Corporate loans USD ($)	Mar. 31, 2011 Corporate loans JPY (¥)	Mar. 31, 2010 Corporate loans JPY (¥)	Mar. 31, 2011 Corporate loans Performance Guarantee USD ($)	Mar. 31, 2011 Corporate loans Performance Guarantee JPY (¥)
Commitments and Contingencies Disclosure [Line Items]
Commitments for purchase of equipment to be leased at cost	$ 137	¥ 11,423
Total rental payments under operating lease agreements	98	8,131	9,571	10,422
Payments for computer systems under non-cancelable contracts	9	759	1,029	985
Longest non-cancelable contracts matured period	Mature in fiscal 2013	Mature in fiscal 2013
Estimated construction costs	1,630	135,567
Total unused credit and capital amount available	934	77,694
Guarantee Obligations Maximum Exposure	5,971	496,452	340,249		3,756	312,273	321,448	14,877	1,237,000
Guarantee Obligations Current Carrying Value	$ 79	¥ 6,533	¥ 5,631		$ 24	¥ 1,958	¥ 2,986	$ 8	¥ 702

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Commitments and Contingencies Disclosure [Line Items]

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Commitments Expiration Period

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Lease office space under operating lease agreements which are primarily cancelable and made rental payments

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 45
-Paragraph 13
-Subparagraph c

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name FASB Interpretation (FIN)
-Number 45
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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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The payments made in the period which reduced loss contingency reserves.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of the disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from a supplier, or to commit resources to supply goods or services to a customer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 25
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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