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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) ¥ in Millions	12 Months Ended
	Mar. 31, 2023 JPY (¥)
Financing Receivable, Modifications [Line Items]
Recorded investment	¥ 5,500
Consumer borrowers
Financing Receivable, Modifications [Line Items]
Recorded investment	808
Consumer borrowers | Real estate loans
Financing Receivable, Modifications [Line Items]
Recorded investment	5
Consumer borrowers | Card loans
Financing Receivable, Modifications [Line Items]
Recorded investment	2
Consumer borrowers | Other
Financing Receivable, Modifications [Line Items]
Recorded investment	801
Corporate borrowers
Financing Receivable, Modifications [Line Items]
Recorded investment	4,692
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas
Financing Receivable, Modifications [Line Items]
Recorded investment	¥ 4,692

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