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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Financing Receivables Modified as Troubled Debt Restructurings (Detail) - JPY (¥) ¥ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Financing Receivable, Modifications [Line Items]
Recorded investment	¥ 1,879	¥ 2,066
Consumer borrowers
Financing Receivable, Modifications [Line Items]
Recorded investment	208	395
Consumer borrowers | Consumer-Card loans
Financing Receivable, Modifications [Line Items]
Recorded investment	3	7
Consumer borrowers | Consumer - Other
Financing Receivable, Modifications [Line Items]
Recorded investment	205	388
Corporate borrowers
Financing Receivable, Modifications [Line Items]
Recorded investment	1,671	1,671
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies in overseas
Financing Receivable, Modifications [Line Items]
Recorded investment	¥ 1,671	¥ 1,671

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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 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Amortized cost of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
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-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

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