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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Allowance for Credit Losses for Installment Loans (Detail) - JPY (¥) ¥ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | ¥ 56,769 | ¥ 58,110 |
Provision (Reversal) | 7,567 | 5,580 |
Allowance of purchased loans during the reporting period | 3,633 | 597 |
Charge-offs | (8,471) | (6,620) |
Recoveries | 443 | 369 |
Other | (951) | (4,280) |
Ending balance | 58,990 | 53,756 |
Collective (pool) assessment | 33,735 | 32,517 | ¥ 32,890
Individual assessment | 25,255 | 21,239 | 23,879
Consumer | Real estate loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 2,891 | 3,203 |
Provision (Reversal) | 93 | 68 |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | (31) | (44) |
Recoveries | 40 | 35 |
Other | (275) | 1 |
Ending balance | 2,718 | 3,263 |
Collective (pool) assessment | 2,675 | 2,972 | 2,609
Individual assessment | 43 | 291 | 282
Consumer | Real estate loans | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,679 | 581 |
Provision (Reversal) | (95) | 359 |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | (78) | 0 |
Recoveries | 0 | 0 |
Other | 47 | (49) |
Ending balance | 1,553 | 891 |
Collective (pool) assessment | 494 | 432 | 505
Individual assessment | 1,059 | 459 | 1,174
Consumer | Card loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 36 | 12 |
Provision (Reversal) | (5) | (8) |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | 0 | 0 |
Recoveries | 4 | 7 |
Other | 0 | 1 |
Ending balance | 35 | 12 |
Collective (pool) assessment | 35 | 12 | 36
Individual assessment | 0 | 0 | 0
Consumer | Other | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 90 | 91 |
Provision (Reversal) | (4) | (2) |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | 0 | 0 |
Recoveries | 2 | 4 |
Other | (84) | (2) |
Ending balance | 4 | 91 |
Collective (pool) assessment | 4 | 6 | 6
Individual assessment | 0 | 85 | 84
Consumer | Other | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 3,048 | 3,060 |
Provision (Reversal) | 1,146 | 1,815 |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | (1,286) | (2,131) |
Recoveries | 184 | 223 |
Other | (16) | (121) |
Ending balance | 3,076 | 2,846 |
Collective (pool) assessment | 1,295 | 1,457 | 1,355
Individual assessment | 1,781 | 1,389 | 1,693
Corporate | Non-recourse Loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 462 | 429 |
Provision (Reversal) | 100 | 156 |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | 0 | 0 |
Recoveries | 0 | 0 |
Other | (6) | 0 |
Ending balance | 556 | 585 |
Collective (pool) assessment | 556 | 585 | 462
Individual assessment | 0 | 0 | 0
Corporate | Non-recourse Loans | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 2,593 |  |
Provision (Reversal) | 2,022 |  |
Allowance of purchased loans during the reporting period | 0 |  |
Charge-offs | 0 |  |
Recoveries | 0 |  |
Other | 1,029 |  |
Ending balance | 5,644 |  |
Collective (pool) assessment | 2,598 |  |
Individual assessment | 3,046 |  |
Corporate | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 2,593 | 1,718 |
Provision (Reversal) |  | 445 |
Allowance of purchased loans during the reporting period |  | 0 |
Charge-offs |  | 0 |
Recoveries |  | 0 |
Other |  | (127) |
Ending balance |  | 2,036 |
Collective (pool) assessment |  | 1,038 | 1,548
Individual assessment |  | 998 | 1,045
Corporate | Other than non-recourse loans | Real estate companies | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 908 | 975 |
Provision (Reversal) | 58 | 58 |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | 0 | 0 |
Recoveries | 13 | 13 |
Other | 0 | (2) |
Ending balance | 979 | 1,044 |
Collective (pool) assessment | 953 | 961 | 877
Individual assessment | 26 | 83 | 31
Corporate | Other than non-recourse loans | Real estate companies | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 2,046 | 1,549 |
Provision (Reversal) | 178 | 361 |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | 0 | 0 |
Recoveries | 0 | 0 |
Other | (967) | (130) |
Ending balance | 1,257 | 1,780 |
Collective (pool) assessment | 715 | 626 | 764
Individual assessment | 542 | 1,154 | 1,282
Corporate | Other than non-recourse loans | Commercial, industrial and other companies loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,078 | 857 |
Provision (Reversal) | (13) | 496 |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | 0 | (125) |
Recoveries | 4 | 16 |
Other | (41) | 0 |
Ending balance | 1,028 | 1,244 |
Collective (pool) assessment | 534 | 773 | 586
Individual assessment | 494 | 471 | 492
Corporate | Other than non-recourse loans | Commercial, industrial and other companies loans | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 20,063 | 25,824 |
Provision (Reversal) | 2,571 | (1,509) |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | (1,992) | (2,433) |
Recoveries | 59 | 24 |
Other | 24 | (3,507) |
Ending balance | 20,725 | 18,399 |
Collective (pool) assessment | 12,006 | 11,492 | 11,919
Individual assessment | 8,719 | 6,907 | 8,144
Loans to Equity Method Investees |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,512 | 878 |
Provision (Reversal) | 19 | 1,410 |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | 0 | (37) |
Recoveries | 0 | 0 |
Other | (5) | (173) |
Ending balance | 1,526 | 2,078 |
Collective (pool) assessment | 186 | 420 | 167
Individual assessment | 1,340 | 1,658 | 1,345
Purchased loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,342 | 1,133 |
Provision (Reversal) | 7 | 7 |
Allowance of purchased loans during the reporting period | 3,633 | 597 |
Charge-offs | (3,659) | (608) |
Recoveries | 0 | 1 |
Other | (984) | (10) |
Ending balance | 339 | 1,120 |
Collective (pool) assessment | 133 | 530 | 521
Individual assessment | 206 | 590 | 821
Net investment in leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 18,122 | 16,780 |
Provision (Reversal) | 1,426 | 1,833 |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | (1,344) | (1,120) |
Recoveries | 137 | 37 |
Other | 321 | (131) |
Ending balance | 18,662 | 17,399 |
Collective (pool) assessment | 11,254 | 10,945 | 11,236
Individual assessment | 7,408 | 6,454 | 6,886
Installment loans and net investment in leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 55,870 | 57,090 |
Provision (Reversal) | 7,503 | 5,489 |
Allowance of purchased loans during the reporting period | 3,633 | 597 |
Charge-offs | (8,390) | (6,498) |
Recoveries | 443 | 360 |
Other | (957) | (4,250) |
Ending balance | 58,102 | 52,788 |
Collective (pool) assessment | 33,438 | 32,249 | 32,591
Individual assessment | 24,664 | 20,539 | 23,279
Other financial assets measured at amortized cost |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 899 | 1,020 |
Provision (Reversal) | 64 | 91 |
Allowance of purchased loans during the reporting period | 0 | 0 |
Charge-offs | (81) | (122) |
Recoveries | 0 | 9 |
Other | 6 | (30) |
Ending balance | 888 | 968 |
Collective (pool) assessment | 297 | 268 | 299
Individual assessment | ¥ 591 | ¥ 700 | ¥ 600

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