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Summary of Potential Future Payments and Book Value Recorded as Guarantee Liabilities of Guarantee Contracts Outstanding (Detail) (JPY ¥) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 31, 2011	Mar. 31, 2011
Guarantor Obligations [Line Items]
Potential future payment	¥ 490,267	¥ 469,030
Book value of guarantee liabilities	7,529	6,533
Maturity of the longest contract (Years)	-	-
Corporate loans
Guarantor Obligations [Line Items]
Potential future payment	318,832	284,851
Book value of guarantee liabilities	1,496	1,958
Maturity of the longest contract (Years)	2026	2018
Transferred Loans
Guarantor Obligations [Line Items]
Potential future payment	154,784	166,936
Book value of guarantee liabilities	3,800	2,218
Maturity of the longest contract (Years)	2043	2043
Housing Loans
Guarantor Obligations [Line Items]
Potential future payment	15,198	16,949
Book value of guarantee liabilities	2,228	2,353
Maturity of the longest contract (Years)	2051	2051
Other
Guarantor Obligations [Line Items]
Potential future payment	1,453	294
Book value of guarantee liabilities	¥ 5	¥ 4
Maturity of the longest contract (Years)	2018	2018

X

- Definition

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

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Describe the approximate term of the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph a

+ Details

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