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Installment Loans (Composition of Installment Loans By Domicile and Type of Borrower) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | ¥ 4,081,019 | ¥ 3,958,814
Equity method investees |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 131,476 | 251,929
Purchased loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans | [1] | 21,389 | 19,973
Japan | Consumer borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 1,976,927 | 1,929,247
Japan | Consumer borrowers | Real estate loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 1,901,794 | 1,851,214
Japan | Consumer borrowers | Card loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 67,874 | 72,353
Japan | Consumer borrowers | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 7,259 | 5,680
Japan | Corporate borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 950,413 | 667,616
Japan | Corporate borrowers | Real estate companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 415,666 | 334,506
Japan | Corporate borrowers | Non-recourse loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 301,477 | 145,286
Japan | Corporate borrowers | Commercial, industrial and other companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 233,270 | 187,824
Overseas | Consumer borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 94,194 | 143,662
Overseas | Consumer borrowers | Real estate loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 55,022 | 96,247
Overseas | Consumer borrowers | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 39,172 | 47,415
Overseas | Corporate borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 906,620 | 946,387
Overseas | Corporate borrowers | Real estate companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 228,793 | 190,630
Overseas | Corporate borrowers | Non-recourse loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 86,724 | 50,263
Overseas | Corporate borrowers | Commercial, industrial and other companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | ¥ 591,103 | ¥ 705,494
[1] | Purchased loans represent loans with evidence of deterioration of credit quality since origination and for which it is probable at acquisition that collection of all contractually required payments from the debtors is unlikely.

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