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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 | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | ¥ 58,110 | ¥ 65,373 | ¥ 71,415
Provision (Reversal) | 13,253 | 20,963 | 12,680
Allowance of purchased loans during the reporting period | 7,507 | 47,676 | 6,901
Charge-offs | (19,304) | (63,473) | (28,372)
Recoveries | 712 | 893 | 593
Other | (3,509) | (13,322) | 2,156
Ending balance | 56,769 | 58,110 | 65,373
Collective (pool) assessment | 32,890 | 37,162 | 51,759
Individual assessment | 23,879 | 20,948 | 13,614
Consumer | Real estate loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 3,203 | 4,092 | 5,716
Provision (Reversal) | (317) | (712) | (1,437)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (62) | (218) | (215)
Recoveries | 66 | 151 | 27
Other | 1 | (110) | 1
Ending balance | 2,891 | 3,203 | 4,092
Collective (pool) assessment | 2,609 | 2,893 | 3,644
Individual assessment | 282 | 310 | 448
Consumer | Real estate loans | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 581 | 446 | 455
Provision (Reversal) | 1,202 | 94 | (19)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | (6) | 0
Recoveries | 1 | 1 | 1
Other | (105) | 46 | 9
Ending balance | 1,679 | 581 | 446
Collective (pool) assessment | 505 | 526 | 446
Individual assessment | 1,174 | 55 | 0
Consumer | Card loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 12 | 9,022 | 10,019
Provision (Reversal) | 13 | 101 | (421)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | (918) | (584)
Recoveries | 11 | 10 | 8
Other | 0 | (8,203) | 0
Ending balance | 36 | 12 | 9,022
Collective (pool) assessment | 36 | 12 | 8,329
Individual assessment | 0 | 0 | 693
Consumer | Other | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 91 | 7,759 | 5,204
Provision (Reversal) | (8) | 5,313 | 4,672
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | (3,856) | (2,124)
Recoveries | 7 | 7 | 8
Other | 0 | (9,132) | (1)
Ending balance | 90 | 91 | 7,759
Collective (pool) assessment | 6 | 6 | 5,337
Individual assessment | 84 | 85 | 2,422
Consumer | Other | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 3,060 | 1,889 | 1,105
Provision (Reversal) | 2,996 | 3,166 | 1,265
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (3,237) | (2,736) | (508)
Recoveries | 453 | 476 | 0
Other | (224) | 265 | 27
Ending balance | 3,048 | 3,060 | 1,889
Collective (pool) assessment | 1,355 | 1,762 | 1,467
Individual assessment | 1,693 | 1,298 | 422
Corporate | Non-recourse Loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 429 | 253 | 81
Provision (Reversal) | 33 | 176 | 173
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Other | 0 | 0 | (1)
Ending balance | 462 | 429 | 253
Collective (pool) assessment | 462 | 429 | 253
Individual assessment | 0 | 0 | 0
Corporate | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,718 | 1,494 | 2,691
Provision (Reversal) | 1,066 | 74 | (1,186)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (150) | (55) | 0
Recoveries | 0 | 0 | 0
Other | (41) | 205 | (11)
Ending balance | 2,593 | 1,718 | 1,494
Collective (pool) assessment | 1,548 | 660 | 560
Individual assessment | 1,045 | 1,058 | 934
Corporate | Other than non-recourse loans | Real estate companies | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 975 | 777 | 617
Provision (Reversal) | (14) | 176 | 131
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (78) | (4) | 0
Recoveries | 26 | 26 | 28
Other | (1) | 0 | 1
Ending balance | 908 | 975 | 777
Collective (pool) assessment | 877 | 889 | 663
Individual assessment | 31 | 86 | 114
Corporate | Other than non-recourse loans | Real estate companies | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,549 | 1,007 | 735
Provision (Reversal) | 682 | 430 | 264
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | 0 | (29)
Recoveries | 0 | 0 | 0
Other | (185) | 112 | 37
Ending balance | 2,046 | 1,549 | 1,007
Collective (pool) assessment | 764 | 1,045 | 1,007
Individual assessment | 1,282 | 504 | 0
Corporate | Other than non-recourse loans | Commercial, industrial and other companies loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 857 | 1,152 | 1,337
Provision (Reversal) | 359 | (44) | 102
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (146) | (281) | (358)
Recoveries | 7 | 9 | 71
Other | 1 | 21 | 0
Ending balance | 1,078 | 857 | 1,152
Collective (pool) assessment | 586 | 722 | 477
Individual assessment | 492 | 135 | 675
Corporate | Other than non-recourse loans | Commercial, industrial and other companies loans | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 25,824 | 19,132 | 18,296
Provision (Reversal) | 1,094 | 8,702 | 7,164
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (4,048) | (4,762) | (8,212)
Recoveries | 34 | 176 | 329
Other | (2,841) | 2,576 | 1,555
Ending balance | 20,063 | 25,824 | 19,132
Collective (pool) assessment | 11,919 | 16,061 | 16,455
Individual assessment | 8,144 | 9,763 | 2,677
Loans to Equity Method Investees |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 878 | 650 | 1,957
Provision (Reversal) | 954 | 99 | 361
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (255) | 0 | (1,842)
Recoveries | 0 | 0 | 0
Other | (65) | 129 | 174
Ending balance | 1,512 | 878 | 650
Collective (pool) assessment | 167 | 422 | 281
Individual assessment | 1,345 | 456 | 369
Purchased loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,133 | 1,148 | 1,575
Provision (Reversal) | 80 | 13 | (261)
Allowance of purchased loans during the reporting period | 7,507 | 47,676 | 6,901
Charge-offs | (7,547) | (47,722) | (7,142)
Recoveries | 2 | 2 | 64
Other | 167 | 16 | 11
Ending balance | 1,342 | 1,133 | 1,148
Collective (pool) assessment | 521 | 548 | 541
Individual assessment | 821 | 585 | 607
Net investment in leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 16,780 | 15,719 | 16,303
Provision (Reversal) | 4,934 | 3,064 | 1,678
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (3,505) | (2,635) | (2,637)
Recoveries | 91 | 26 | 27
Other | (178) | 606 | 348
Ending balance | 18,122 | 16,780 | 15,719
Collective (pool) assessment | 11,236 | 10,866 | 12,032
Individual assessment | 6,886 | 5,914 | 3,687
Installment loans and net investment in leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 57,090 | 64,540 | 66,091
Provision (Reversal) | 13,074 | 20,652 | 12,486
Allowance of purchased loans during the reporting period | 7,507 | 47,676 | 6,901
Charge-offs | (19,028) | (63,193) | (23,651)
Recoveries | 698 | 884 | 563
Other | (3,471) | (13,469) | 2,150
Ending balance | 55,870 | 57,090 | 64,540
Collective (pool) assessment | 32,591 | 36,841 | 51,492
Individual assessment | 23,279 | 20,249 | 13,048
Other financial assets measured at amortized cost |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,020 | 833 | 5,324
Provision (Reversal) | 179 | 311 | 194
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (276) | (280) | (4,721)
Recoveries | 14 | 9 | 30
Other | (38) | 147 | 6
Ending balance | 899 | 1,020 | 833
Collective (pool) assessment | 299 | 321 | 267
Individual assessment | ¥ 600 | ¥ 699 | ¥ 566

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