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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, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | ¥ 65,373 | ¥ 71,415 | ¥ 79,995
Provision (Reversal) | 20,963 | 12,680 | 9,816
Allowance of purchased loans during the reporting period | 47,676 | 6,901 | 2,210
Charge-offs | (63,473) | (28,372) | (24,897)
Recoveries | 893 | 593 | 474
Other | (13,322) | 2,156 | 3,817
Ending balance | 58,110 | 65,373 | 71,415
Collective (pool) assessment | 37,162 | 51,759 | 49,660
Individual assessment | 20,948 | 13,614 | 21,755
Consumer | Real estate loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 4,092 | 5,716 | 5,922
Provision (Reversal) | (712) | (1,437) | 340
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (218) | (215) | (570)
Recoveries | 151 | 27 | 24
Other | (110) | 1 | 0
Ending balance | 3,203 | 4,092 | 5,716
Collective (pool) assessment | 2,893 | 3,644 | 5,211
Individual assessment | 310 | 448 | 505
Consumer | Real estate loans | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 446 | 455 | 470
Provision (Reversal) | 94 | (19) | (34)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (6) | 0 | 0
Recoveries | 1 | 1 | 4
Other | 46 | 9 | 15
Ending balance | 581 | 446 | 455
Collective (pool) assessment | 526 | 446 | 455
Individual assessment | 55 | 0 | 0
Consumer | Card loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 9,022 | 10,019 | 12,984
Provision (Reversal) | 101 | (421) | (1,301)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (918) | (584) | (1,669)
Recoveries | 10 | 8 | 4
Other | (8,203) | 0 | 1
Ending balance | 12 | 9,022 | 10,019
Collective (pool) assessment | 12 | 8,329 | 9,423
Individual assessment | 0 | 693 | 596
Consumer | Other | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 7,759 | 5,204 | 8,359
Provision (Reversal) | 5,313 | 4,672 | 4,948
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (3,856) | (2,124) | (8,114)
Recoveries | 7 | 8 | 11
Other | (9,132) | (1) | 0
Ending balance | 91 | 7,759 | 5,204
Collective (pool) assessment | 6 | 5,337 | 2,946
Individual assessment | 85 | 2,422 | 2,258
Consumer | Other | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,889 | 1,105 | 1,275
Provision (Reversal) | 3,166 | 1,265 | 300
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (2,736) | (508) | (644)
Recoveries | 476 | 0 | 0
Other | 265 | 27 | 174
Ending balance | 3,060 | 1,889 | 1,105
Collective (pool) assessment | 1,762 | 1,467 | 961
Individual assessment | 1,298 | 422 | 144
Corporate | Real estate companies | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 777 | 617 | 901
Provision (Reversal) | 176 | 131 | (204)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (4) | 0 | (109)
Recoveries | 26 | 28 | 29
Other | 0 | 1 | 0
Ending balance | 975 | 777 | 617
Collective (pool) assessment | 889 | 663 | 490
Individual assessment | 86 | 114 | 127
Corporate | Real estate companies | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,007 | 735 | 1,539
Provision (Reversal) | 430 | 264 | (855)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | (29) | (10)
Recoveries | 0 | 0 | 0
Other | 112 | 37 | 61
Ending balance | 1,549 | 1,007 | 735
Collective (pool) assessment | 1,045 | 1,007 | 735
Individual assessment | 504 | 0 | 0
Corporate | Commercial, industrial and other companies loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,152 | 1,337 | 1,938
Provision (Reversal) | (44) | 102 | 93
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (281) | (358) | (761)
Recoveries | 9 | 71 | 67
Other | 21 | 0 | 0
Ending balance | 857 | 1,152 | 1,337
Collective (pool) assessment | 722 | 477 | 505
Individual assessment | 135 | 675 | 832
Corporate | Commercial, industrial and other companies loans | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 19,132 | 18,296 | 18,763
Provision (Reversal) | 8,702 | 7,164 | 3,503
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (4,762) | (8,212) | (6,185)
Recoveries | 176 | 329 | 155
Other | 2,576 | 1,555 | 2,060
Ending balance | 25,824 | 19,132 | 18,296
Collective (pool) assessment | 16,061 | 16,455 | 13,367
Individual assessment | 9,763 | 2,677 | 4,929
Corporate | Non-recourse Loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 253 | 81 | 32
Provision (Reversal) | 176 | 173 | 49
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Other | 0 | (1) | 0
Ending balance | 429 | 253 | 81
Collective (pool) assessment | 429 | 253 | 81
Individual assessment | 0 | 0 | 0
Corporate | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,494 | 2,691 | 3,450
Provision (Reversal) | 74 | (1,186) | (1,035)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (55) | 0 | 0
Recoveries | 0 | 0 | 0
Other | 205 | (11) | 276
Ending balance | 1,718 | 1,494 | 2,691
Collective (pool) assessment | 660 | 560 | 1,836
Individual assessment | 1,058 | 934 | 855
Loans to Equity Method Investees |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 650 | 1,957 | 1,050
Provision (Reversal) | 99 | 361 | 1,449
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | (1,842) | (790)
Recoveries | 0 | 0 | 0
Other | 129 | 174 | 248
Ending balance | 878 | 650 | 1,957
Collective (pool) assessment | 422 | 281 | 314
Individual assessment | 456 | 369 | 1,643
Purchased loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,148 | 1,575 | 1,835
Provision (Reversal) | 13 | (261) | (227)
Allowance of purchased loans during the reporting period | 47,676 | 6,901 | 2,210
Charge-offs | (47,722) | (7,142) | (2,372)
Recoveries | 2 | 64 | 114
Other | 16 | 11 | 15
Ending balance | 1,133 | 1,148 | 1,575
Collective (pool) assessment | 548 | 541 | 608
Individual assessment | 585 | 607 | 967
Net investment in leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 15,719 | 16,303 | 16,522
Provision (Reversal) | 3,064 | 1,678 | 1,577
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (2,635) | (2,637) | (2,802)
Recoveries | 26 | 27 | 21
Other | 606 | 348 | 985
Ending balance | 16,780 | 15,719 | 16,303
Collective (pool) assessment | 10,866 | 12,032 | 12,480
Individual assessment | 5,914 | 3,687 | 3,823
Installment loans and net investment in leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 64,540 | 66,091 | 75,040
Provision (Reversal) | 20,652 | 12,486 | 8,603
Allowance of purchased loans during the reporting period | 47,676 | 6,901 | 2,210
Charge-offs | (63,193) | (23,651) | (24,026)
Recoveries | 884 | 563 | 429
Other | (13,469) | 2,150 | 3,835
Ending balance | 57,090 | 64,540 | 66,091
Collective (pool) assessment | 36,841 | 51,492 | 49,412
Individual assessment | 20,249 | 13,048 | 16,679
Other financial assets measured at amortized cost |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 833 | 5,324 | 4,955
Provision (Reversal) | 311 | 194 | 1,213
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (280) | (4,721) | (871)
Recoveries | 9 | 30 | 45
Other | 147 | 6 | (18)
Ending balance | 1,020 | 833 | 5,324
Collective (pool) assessment | 321 | 267 | 248
Individual assessment | ¥ 699 | ¥ 566 | ¥ 5,076

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