Insurance-Related Accounts (Details) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Insurance-Related Accounts (Textuals) [Abstract]
Combined amounts of statutory net equity of insurance subsidiaries which is not measured in accordance with U.S.GAAP	¥ 232,160	¥ 206,794
Life insurance revenues	600,291	554,650	526,303
Non life insurance revenues	71,037	64,987	58,576
Amortization charged to income	59,249	53,767	64,599
Minimum range of interest rates for future policy benefit based on market conditions and expected investment returns	1.40%
Maximum range of interest rates for future policy benefit based on market conditions and expected investment returns	4.60%
Future insurance policy benefits amount	¥ 2,918,960	¥ 2,673,357

Combined amounts of statutory net equity of insurance subsidiaries which is not measured in accordance with U.S.GAAP.

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- Definition

Insurance Related Accounts.

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Life insurance revenues.

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- Definition

Maximum range of interest rates for future policy benefit based on market conditions and expected investment returns.

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Minimum range of interest rates for future policy benefit based on market conditions and expected investment returns.

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- Definition

Non life insurance revenues.

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- Definition

Amount of deferred policy acquisition costs charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 97
-Paragraph 22, 23, 24, 25, 26

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 16, 18
-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 7
-Article 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 60
-Paragraph 60
-Subparagraph c

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 95-1
-Paragraph 19, 20, 21, 22, 23

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- Definition

Carrying amount as of the balance sheet date of the present value of the future profits asset (also known as value of business acquired).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 92-9

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 7

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