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Installment Loans (Composition of Installment Loans By Domicile and Type of Borrower) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | ¥ 3,877,602 | ¥ 3,862,604
Purchased loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans | [1] | 12,255 | 13,747
Japan | Consumer borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 2,151,188 | 2,209,027
Japan | Consumer borrowers | Real estate loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 1,949,865 | 2,007,570
Japan | Consumer borrowers | Card loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 171,635 | 173,687
Japan | Consumer borrowers | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 29,688 | 27,770
Japan | Corporate borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 586,678 | 521,299
Japan | Corporate borrowers | Real estate companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 296,228 | 278,607
Japan | Corporate borrowers | Non-recourse loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 124,499 | 74,085
Japan | Corporate borrowers | Commercial, industrial and other companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 165,951 | 168,607
Overseas | Consumer borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 150,148 | 135,996
Overseas | Consumer borrowers | Real estate loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 107,094 | 105,860
Overseas | Consumer borrowers | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 43,054 | 30,136
Overseas | Corporate borrowers |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 977,333 | 982,535
Overseas | Corporate borrowers | Real estate companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 277,839 | 273,789
Overseas | Corporate borrowers | Non-recourse loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | 38,654 | 80,918
Overseas | Corporate borrowers | Commercial, industrial and other companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Installment loans |  | ¥ 660,840 | ¥ 627,828
[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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