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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	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Guarantor Obligations [Line Items]
Potential future payment	¥ 1,231,425	¥ 1,153,273
Book value of guarantee liabilities	57,456	60,458
Transferred loans
Guarantor Obligations [Line Items]
Potential future payment	436,069	417,587
Book value of guarantee liabilities	¥ 2,185	¥ 4,103
Maturity of the longest contract (Years)	2062	2062
Consumer loans
Guarantor Obligations [Line Items]
Potential future payment	¥ 295,273	¥ 284,891
Book value of guarantee liabilities	¥ 48,207	¥ 47,461
Maturity of the longest contract (Years)	2034	2033
Real estate loans
Guarantor Obligations [Line Items]
Potential future payment	¥ 18,193	¥ 12,087
Book value of guarantee liabilities	¥ 2,031	¥ 3,953
Maturity of the longest contract (Years)	2048	2048
Other
Guarantor Obligations [Line Items]
Potential future payment	¥ 2,484	¥ 2,294
Book value of guarantee liabilities	¥ 0	¥ 46
Maturity of the longest contract (Years)	2036	2035
Corporate loans
Guarantor Obligations [Line Items]
Potential future payment	¥ 479,406	¥ 436,414
Book value of guarantee liabilities	¥ 5,033	¥ 4,895
Maturity of the longest contract (Years)	2029	2027

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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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

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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