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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Past Due Financial Assets Modified to Debtors (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified			¥ 5,500
Current
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	¥ 24,963	¥ 10,522
30-89 days past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	2,142	91
90 days or more past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	62	291
Consumer borrowers
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified			808
Consumer borrowers | Current
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	173	35
Consumer borrowers | 30-89 days past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	1	91
Consumer borrowers | 90 days or more past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	17	7
Consumer borrowers | Real estate loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified			5
Consumer borrowers | Real estate loans | Current
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified		1
Consumer borrowers | Real estate loans | 30-89 days past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified		0
Consumer borrowers | Real estate loans | 90 days or more past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified		0
Consumer borrowers | Other
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified			¥ 801
Consumer borrowers | Other | Current
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	173	34
Consumer borrowers | Other | 30-89 days past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	1	91
Consumer borrowers | Other | 90 days or more past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	17	7
Corporate borrowers | Current
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	23,857	6,140
Corporate borrowers | 30-89 days past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	2,141	0
Corporate borrowers | 90 days or more past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	45	284
Corporate borrowers | Non-recourse Loans | Current
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0	1,277
Corporate borrowers | Non-recourse Loans | Current | The Americas
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0	1,277
Corporate borrowers | Non-recourse Loans | 30-89 days past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	2,141	0
Corporate borrowers | Non-recourse Loans | 30-89 days past-due | The Americas
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	2,141	0
Corporate borrowers | Non-recourse Loans | 90 days or more past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0	0
Corporate borrowers | Non-recourse Loans | 90 days or more past-due | The Americas
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0	0
Corporate borrowers | Other than non-recourse loans | Current
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	23,857	4,863
Corporate borrowers | Other than non-recourse loans | Current | Real estate companies | Japan
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	1,243	37
Corporate borrowers | Other than non-recourse loans | Current | Real estate companies | Overseas
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	1,701
Corporate borrowers | Other than non-recourse loans | Current | Commercial, industrial and other companies | Japan
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	623	481
Corporate borrowers | Other than non-recourse loans | Current | Commercial, industrial and other companies | Overseas
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	20,290	4,345
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0	0
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Real estate companies | Japan
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0	0
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Real estate companies | Overseas
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Commercial, industrial and other companies | Japan
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0	0
Corporate borrowers | Other than non-recourse loans | 30-89 days past-due | Commercial, industrial and other companies | Overseas
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0	0
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	45	284
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Real estate companies | Japan
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	29	32
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Real estate companies | Overseas
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Commercial, industrial and other companies | Japan
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0	230
Corporate borrowers | Other than non-recourse loans | 90 days or more past-due | Commercial, industrial and other companies | Overseas
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	16	22
Loans to Equity Method Investees | Current
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	933	4,347
Loans to Equity Method Investees | 30-89 days past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	0	0
Loans to Equity Method Investees | 90 days or more past-due
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified	¥ 0	¥ 0

X

- Definition

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