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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, 2025 | Mar. 31, 2024
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | ¥ 73,118 | ¥ 65,294
Ending balance | 147,893 | 73,118
Interest income recognized during the reporting period | 345 | 799
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 2,975 | 3,918
Consumer borrowers | Real estate loans | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,095 | 1,693
Ending balance | 1,235 | 1,095
Interest income recognized during the reporting period | 260 | 246
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 128 | 129
Consumer borrowers | Real estate loans | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,107 | 547
Ending balance | 4,976 | 1,107
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 | 100
Consumer borrowers | Card loans | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 0 | 1,367
Ending balance |  | 0
Interest income recognized during the reporting period |  | 27
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income |  | 0
Consumer borrowers | Other | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 96 | 5,429
Ending balance | 86 | 96
Interest income recognized during the reporting period | 1 | 169
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 7
Consumer borrowers | Other | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 2,574 | 1,105
Ending balance | 2,373 | 2,574
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 | 4 | 35
Corporate borrowers | Non-recourse Loans | The Americas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 3,116 | 3,248
Ending balance | 3,831 | 3,116
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 | 603 | 0
Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 115 | 219
Ending balance | 29 | 115
Interest income recognized during the reporting period | 30 | 45
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 4
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 16,093 | 12,804
Ending balance | 52,272 | 16,093
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 | 355 | 1,118
Ending balance | 520 | 355
Interest income recognized during the reporting period | 54 | 312
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 37 | 42
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 | 27,636 | 20,470
Ending balance | 60,629 | 27,636
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 | 2,203 | 2,319
Loans to Equity Method Investees |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,929 | 667
Ending balance | 1,345 | 1,929
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 | 1,282
Net investment in leases |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 19,002 | 16,627
Ending balance | 20,597 | 19,002
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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