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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Non-Accrual of Financial Assets (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | ¥ 65,294 | ¥ 73,459
Ending balance | 73,118 | 65,294
Interest income recognized during the reporting period | 799 | 555
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 3,918 | 2,367
Consumer borrowers | Real estate loans | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,693 | 1,824
Ending balance | 1,095 | 1,693
Interest income recognized during the reporting period | 246 | 235
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 129 | 41
Consumer borrowers | Real estate loans | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 547 | 475
Ending balance | 1,107 | 547
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 100 | 0
Consumer borrowers | Card loans | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,367 | 503
Ending balance | 0 | 1,367
Interest income recognized during the reporting period | 27 | 28
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 0
Consumer borrowers | Other | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 5,429 | 2,391
Ending balance | 96 | 5,429
Interest income recognized during the reporting period | 169 | 170
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 7 | 10
Consumer borrowers | Other | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,105 | 519
Ending balance | 2,574 | 1,105
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 35 | 0
Corporate borrowers | Non-recourse Loans | The Americas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 3,248 | 8,787
Ending balance | 3,116 | 3,248
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 0
Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 219 | 351
Ending balance | 115 | 219
Interest income recognized during the reporting period | 45 | 51
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 4 | 13
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 12,804 | 20,879
Ending balance | 16,093 | 12,804
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 0
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,118 | 1,267
Ending balance | 355 | 1,118
Interest income recognized during the reporting period | 312 | 71
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 42 | 190
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 20,470 | 18,634
Ending balance | 27,636 | 20,470
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 2,319 | 2,113
Loans to Equity Method Investees |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 667 | 58
Ending balance | 1,929 | 667
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 1,282 | 0
Net investment in leases |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 16,627 | 17,771
Ending balance | 19,002 | 16,627
Interest income recognized during the reporting period | 0 | 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | ¥ 0 | ¥ 0

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