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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, 2023 | Mar. 31, 2022
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | ¥ 73,401 | ¥ 81,308
Ending balance | 64,627 | 73,401
Interest income recognized during the reporting period | 555 | 690
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 2,367 | 4,296
Consumer borrowers | Japan Real Estate Loans [Member] |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,824 | 1,976
Ending balance | 1,693 | 1,824
Interest income recognized during the reporting period | 235 | 193
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 41 | 21
Consumer borrowers | Overseas Real Estate Loans [Member] |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 475 | 570
Ending balance | 547 | 475
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 | 129
Consumer borrowers | Japan Card Loans [Member] |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 503 | 1,115
Ending balance | 1,367 | 503
Interest income recognized during the reporting period | 28 | 35
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 0 | 0
Consumer borrowers | Japan Other [Member] |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 2,391 | 5,970
Ending balance | 5,429 | 2,391
Interest income recognized during the reporting period | 170 | 208
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 10 | 0
Consumer borrowers | Overseas Other [Member] |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 519 | 691
Ending balance | 1,105 | 519
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 | 39
Corporate borrowers | The Americas Non-recourse loans [Member] |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 8,787 | 10,148
Ending balance | 3,248 | 8,787
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 | Japan real estate companies [Member] |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 351 | 778
Ending balance | 219 | 351
Interest income recognized during the reporting period | 51 | 51
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 13 | 61
Corporate borrowers | Overseas real estate companies [Member] |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 20,879 | 14,505
Ending balance | 12,804 | 20,879
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 | Japan commercial, industrial companies [Member] |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 1,267 | 1,993
Ending balance | 1,118 | 1,267
Interest income recognized during the reporting period | 71 | 91
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 190 | 28
Corporate borrowers | Overseas commercial, industrial companies and other [Member] |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 18,634 | 26,396
Ending balance | 20,470 | 18,634
Interest income recognized during the reporting period | 0 | 112
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income | 2,113 | 4,018
Net investment in leases |  |
Dislcosure Detail Of Non Accrual Of Financial Assets [Line Items] |  |
Beginning balance | 17,771 | 17,166
Ending balance | 16,627 | 17,771
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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