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Commitments, Guarantees, and Contingent Liabilities (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	6 Months Ended	12 Months Ended
	Sep. 30, 2023	Mar. 31, 2023
Guarantor Obligations [Line Items]
Potential future payment	¥ 1,316,556	¥ 1,231,425
Book value of guarantee liabilities	57,485	57,456
Transferred loans
Guarantor Obligations [Line Items]
Potential future payment	509,204	436,069
Book value of guarantee liabilities	¥ 2,869	¥ 2,185
Maturity of the longest contract (Years)	2062	2062
Consumer loans
Guarantor Obligations [Line Items]
Potential future payment	¥ 301,470	¥ 295,273
Book value of guarantee liabilities	¥ 49,420	¥ 48,207
Maturity of the longest contract (Years)	2034	2034
Real estate loans
Guarantor Obligations [Line Items]
Potential future payment	¥ 6,963	¥ 18,193
Book value of guarantee liabilities	¥ 466	¥ 2,031
Maturity of the longest contract (Years)	2048	2048
Other
Guarantor Obligations [Line Items]
Potential future payment	¥ 13,481	¥ 2,484
Book value of guarantee liabilities	¥ 1	¥ 0
Maturity of the longest contract (Years)	2044	2036
Corporate loans
Guarantor Obligations [Line Items]
Potential future payment	¥ 485,438	¥ 479,406
Book value of guarantee liabilities	¥ 4,729	¥ 5,033
Maturity of the longest contract (Years)	2030	2029

X

- Definition

Guarantee Obligations Maturity Period

+ References

No definition available.

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- 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/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

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- 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/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

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