Fair Value Measurements (Details 1) (JPY ¥) In Millions	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010
Trading securities [Member]
Changes in fair value of level 3 assets and liabilities
Beginning balance		¥ 3,003
Total realized and unrealized gains (losses):
Included in earnings		181
Purchases, issuances, sales and settlements		(562)
Transfers in and/or out of level 3		(2,622)
Ending Balance		0
Available-for sale securities, Debt securities, Japanese corporate bonds [Member]
Changes in fair value of level 3 assets and liabilities
Beginning balance	1,097	7,630
Total realized and unrealized gains (losses):
Included in earnings	(13)	(260)
Included in other comprehensive income (loss)	(18)
Purchases, issuances, sales and settlements	3,515	(5,660)
Transfers in and/or out of level 3		(613)
Ending Balance	4,581	1,097
Changes in unrealized gains (losses) relating to instruments still held at reporting date:
Changes in unrealized gains (losses) relating to instruments still held at reporting date Included in earnings	(2)
Available-for sale securities, Debt securities, Foreign corporate bonds [Member]
Changes in fair value of level 3 assets and liabilities
Beginning balance	17,433	51,798
Total realized and unrealized gains (losses):
Included in earnings	(224)	(404)
Included in other comprehensive income (loss)	(842)	1,818
Purchases, issuances, sales and settlements	8,251	(4,247)
Transfers in and/or out of level 3	(4,568)	(31,532)
Ending Balance	20,050	17,433
Changes in unrealized gains (losses) relating to instruments still held at reporting date:
Changes in unrealized gains (losses) relating to instruments still held at reporting date Included in earnings	10	(40)
Available-for sale securities, Equity securities [Member]
Changes in fair value of level 3 assets and liabilities
Beginning balance	3,936	3,562
Total realized and unrealized gains (losses):
Included in earnings		(2)
Included in other comprehensive income (loss)	32	374
Purchases, issuances, sales and settlements		2
Ending Balance	3,968	3,936
Other Investments [Member]
Changes in fair value of level 3 assets and liabilities
Beginning balance	69,672	59,781
Total realized and unrealized gains (losses):
Included in earnings	(3,332)	6,288
Included in other comprehensive income (loss)	2,606	2,781
Purchases, issuances, sales and settlements	1,112	822
Ending Balance	70,058	69,672
Changes in unrealized gains (losses) relating to instruments still held at reporting date:
Changes in unrealized gains (losses) relating to instruments still held at reporting date Included in earnings	(3,779)	6,726
Derivative assets [Member]
Changes in fair value of level 3 assets and liabilities
Beginning balance		0
Total realized and unrealized gains (losses):
Included in earnings		(69)
Purchases, issuances, sales and settlements		(186)
Transfers in and/or out of level 3		255
Ending Balance		¥ 0

Changes in unrealized gains (losses) relating to instruments still held at reporting date.

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Total realized and unrealized gains (losses).

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This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in investment income. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph d

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ 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(1)

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This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity.

+ 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(1)

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- Definition

This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3).

+ 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(2)

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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)

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- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ 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

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