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Summary of Potential Future Payments, Book Value Recorded as Guarantee Liabilities of Guarantee Contracts Outstanding and Maturity of Longest Guarantee Contracts (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Guarantor Obligations [Line Items]
Potential future payment	¥ 694,542	¥ 622,292
Book value of guarantee liabilities	23,960	22,481
Maturity of the longest contract (Years)	-	-
Corporate Loans
Guarantor Obligations [Line Items]
Potential future payment	349,435	316,650
Book value of guarantee liabilities	3,577	2,587
Maturity of the longest contract (Years)	2021	2026
Transferred Loans
Guarantor Obligations [Line Items]
Potential future payment	212,150	196,162
Book value of guarantee liabilities	3,671	4,246
Maturity of the longest contract (Years)	2045	2044
Consumer Loan
Guarantor Obligations [Line Items]
Potential future payment	96,183	77,034
Book value of guarantee liabilities	9,607	8,085
Maturity of the longest contract (Years)	2018	2018
Housing Loans
Guarantor Obligations [Line Items]
Potential future payment	33,704	29,510
Book value of guarantee liabilities	7,013	7,437
Maturity of the longest contract (Years)	2051	2051
Other
Guarantor Obligations [Line Items]
Potential future payment	3,070	2,936
Book value of guarantee liabilities	¥ 92	¥ 126
Maturity of the longest contract (Years)	2024	2024

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 Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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

X

- Details

Name:	us-gaap_GuaranteeObligationsLineItems
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 Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

Name:	us-gaap_GuaranteeObligationsMaximumExposure
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 Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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