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Total Other-Than-Temporary Impairment with an Offset for the Amount of the Total Other-Than-Temporary Impairment Recognized in Other Comprehensive Income (Loss) (Detail) In Millions	12 Months Ended
	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)	Mar. 31, 2009 JPY (¥)
Schedule of Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Income Statement, Reported Amounts, Summary [Line Items]
Total other-than-temporary impairment losses	$ 267	¥ 22,212	¥ 26,057	¥ 20,060
Portion of loss recognized in other comprehensive income (before taxes)	(5)	(463)	(2,423)	(1,486)
Net impairment losses recognized in earnings	$ 262	¥ 21,749	¥ 23,634	¥ 18,574

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- Definition

Other-than-temporary impairment losses recognized in other comprehensive income

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- Definition

This element represents the amount by which the carrying amount exceeds the fair value of the investment. The amount is charged to income if the decline in fair value is deemed to be other than temporary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16

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- Definition

This element represents the amount of loss recognized for other than temporary impairments of investments in debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16

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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.

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