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Installment Loans (Composition of Installment Loans By Domicile and Type of Borrower) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | ¥ 3,958,814 | ¥ 3,905,026
Equity method investees |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 251,929 | 27,424
Purchased loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans | [1] | 19,973 | 12,255
Japan | Consumer borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 1,929,247 | 2,151,188
Japan | Consumer borrowers | Real estate loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 1,851,214 | 1,949,865
Japan | Consumer borrowers | Card loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 72,353 | 171,635
Japan | Consumer borrowers | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 5,680 | 29,688
Japan | Corporate borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 667,616 | 586,678
Japan | Corporate borrowers | Real estate companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 334,506 | 296,228
Japan | Corporate borrowers | Non-recourse loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 145,286 | 124,499
Japan | Corporate borrowers | Commercial, industrial and other companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 187,824 | 165,951
Overseas | Consumer borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 143,662 | 150,148
Overseas | Consumer borrowers | Real estate loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 96,247 | 107,094
Overseas | Consumer borrowers | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 47,415 | 43,054
Overseas | Corporate borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 946,387 | 977,333
Overseas | Corporate borrowers | Real estate companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 190,630 | 277,839
Overseas | Corporate borrowers | Non-recourse loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 50,263 | 38,654
Overseas | Corporate borrowers | Commercial, industrial and other companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | ¥ 705,494 | ¥ 660,840
[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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