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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, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | ¥ 71,416 | ¥ 79,995 | ¥ 56,836
Reclassification to allowance for investment in operating leases |  |  | (312)
Provision (Reversal) | 12,680 | 9,816 | 23,596
Allowance of purchased loans during the reporting period | 6,901 | 2,210 | 3,899
Charge-offs | (28,372) | (24,897) | (37,432)
Recoveries | 593 | 474 | 805
Other | 2,154 | 3,818 | 858
Ending balance | 65,372 | 71,416 | 79,995
Collective (pool) assessment | 51,759 | 49,660 | 58,141
Individual assessment | 13,613 | 21,756 | 21,854
Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 88,269
Net investment in leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 16,303 | 16,522 | 11,692
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | 1,678 | 1,577 | 3,285
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (2,637) | (2,802) | (2,668)
Recoveries | 27 | 21 | 10
Other | 348 | 985 | 653
Ending balance | 15,719 | 16,303 | 16,522
Collective (pool) assessment | 12,032 | 12,480 | 13,267
Individual assessment | 3,687 | 3,823 | 3,255
Net investment in leases | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 15,242
Installment loans and net investment in leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 64,134 | 73,990 | 55,687
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | 12,125 | 7,154 | 19,113
Allowance of purchased loans during the reporting period | 6,901 | 2,210 | 3,899
Charge-offs | (21,809) | (23,236) | (37,088)
Recoveries | 563 | 429 | 794
Other | 1,976 | 3,587 | 1,209
Ending balance | 63,890 | 64,134 | 73,990
Collective (pool) assessment | 51,211 | 49,098 | 57,331
Individual assessment | 12,679 | 15,036 | 16,659
Installment loans and net investment in leases | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 86,063
Other financial assets measured at amortized cost |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 7,282 | 6,005 | 1,149
Reclassification to allowance for investment in operating leases |  |  | (312)
Provision (Reversal) | 555 | 2,662 | 4,483
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (6,563) | (1,661) | (344)
Recoveries | 30 | 45 | 11
Other | 178 | 231 | (351)
Ending balance | 1,482 | 7,282 | 6,005
Collective (pool) assessment | 548 | 562 | 810
Individual assessment | 934 | 6,720 | 5,195
Other financial assets measured at amortized cost | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 2,206
Consumer | Real estate loans [Member] | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 5,716 | 5,922 | 3,112
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | (1,437) | 340 | 390
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (215) | (570) | (495)
Recoveries | 27 | 24 | 59
Other | 1 | 0 | 0
Ending balance | 4,092 | 5,716 | 5,922
Collective (pool) assessment | 3,644 | 5,211 | 5,354
Individual assessment | 448 | 505 | 568
Consumer | Real estate loans [Member] | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 455 | 470 | 128
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | (19) | (34) | 412
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | 0 | 0
Recoveries | 1 | 4 | 1
Other | 9 | 15 | 31
Ending balance | 446 | 455 | 470
Collective (pool) assessment | 446 | 455 | 470
Individual assessment | 0 | 0 | 0
Consumer | Real estate loans [Member] | Restatement Adjustment | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 5,968
Consumer | Real estate loans [Member] | Restatement Adjustment | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 26
Consumer | Card loans [Member] | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 10,019 | 12,984 | 3,785
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | (421) | (1,301) | (802)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (584) | (1,669) | (2,150)
Recoveries | 8 | 4 | 6
Other | 0 | 1 | (1)
Ending balance | 9,022 | 10,019 | 12,984
Collective (pool) assessment | 8,329 | 9,423 | 12,283
Individual assessment | 693 | 596 | 701
Consumer | Card loans [Member] | Restatement Adjustment | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 15,931
Consumer | Other [Member] | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 5,204 | 8,359 | 12,735
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | 4,672 | 4,948 | 5,875
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (2,124) | (8,114) | (9,296)
Recoveries | 8 | 11 | 8
Other | (1) | 0 | 0
Ending balance | 7,759 | 5,204 | 8,359
Collective (pool) assessment | 5,337 | 2,946 | 5,616
Individual assessment | 2,422 | 2,258 | 2,743
Consumer | Other [Member] | Restatement Adjustment | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 11,772
Consumer | Other [Member] | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,105 | 1,275 | 782
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | 1,265 | 300 | 739
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (508) | (644) | (1,754)
Recoveries | 0 | 0 | 577
Other | 27 | 174 | 368
Ending balance | 1,889 | 1,105 | 1,275
Collective (pool) assessment | 1,467 | 961 | 1,038
Individual assessment | 422 | 144 | 237
Consumer | Other [Member] | Restatement Adjustment | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 1,345
Corporate | Non-recourse Loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 81 | 32 | 13
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | 173 | 49 | (5)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Other | (1) | 0 | 0
Ending balance | 253 | 81 | 32
Collective (pool) assessment | 253 | 81 | 32
Individual assessment | 0 | 0 | 0
Corporate | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 2,691 | 3,450 | 1,773
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | (1,186) | (1,035) | 43
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Other | (11) | 276 | 57
Ending balance | 1,494 | 2,691 | 3,450
Collective (pool) assessment | 560 | 1,836 | 3,218
Individual assessment | 934 | 855 | 232
Corporate | Non-recourse Loans | Restatement Adjustment | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 37
Corporate | Non-recourse Loans | Restatement Adjustment | The Americas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 3,350
Corporate | Corporate Real Estate Companies Loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 617 | 901 | 983
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | 131 | (204) | (58)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | 0 | (109) | (96)
Recoveries | 28 | 29 | 25
Other | 1 | 0 | 1
Ending balance | 777 | 617 | 901
Collective (pool) assessment | 663 | 490 | 621
Individual assessment | 114 | 127 | 280
Corporate | Corporate Real Estate Companies Loans | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 735 | 1,539 | 2,010
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | 264 | (855) | (1,502)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (29) | (10) | (570)
Recoveries | 0 | 0 | 33
Other | 37 | 61 | (11)
Ending balance | 1,007 | 735 | 1,539
Collective (pool) assessment | 1,007 | 735 | 1,539
Individual assessment | 0 | 0 | 0
Corporate | Corporate Real Estate Companies Loans | Restatement Adjustment | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 1,029
Corporate | Corporate Real Estate Companies Loans | Restatement Adjustment | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 3,589
Corporate | Corporate Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,337 | 1,938 | 2,447
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | 102 | 93 | (27)
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (358) | (761) | (592)
Recoveries | 71 | 67 | 11
Other | 0 | 0 | 1
Ending balance | 1,152 | 1,337 | 1,938
Collective (pool) assessment | 477 | 505 | 199
Individual assessment | 675 | 832 | 1,739
Corporate | Corporate Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 18,296 | 18,763 | 14,769
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | 7,164 | 3,503 | 10,410
Allowance of purchased loans during the reporting period | 0 | 0 | 0
Charge-offs | (8,212) | (6,185) | (15,427)
Recoveries | 329 | 155 | 18
Other | 1,555 | 2,060 | (9)
Ending balance | 19,132 | 18,296 | 18,763
Collective (pool) assessment | 16,455 | 13,367 | 13,013
Individual assessment | 2,677 | 4,929 | 5,750
Corporate | Corporate Commercial, industrial and other companies | Restatement Adjustment | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 2,545
Corporate | Corporate Commercial, industrial and other companies | Restatement Adjustment | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 23,771
Purchased loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 1,575 | 1,835 | 1,458
Reclassification to allowance for investment in operating leases |  |  | 0
Provision (Reversal) | (261) | (227) | 353
Allowance of purchased loans during the reporting period | 6,901 | 2,210 | 3,899
Charge-offs | (7,142) | (2,372) | (4,040)
Recoveries | 64 | 114 | 46
Other | 11 | 15 | 119
Ending balance | 1,148 | 1,575 | 1,835
Collective (pool) assessment | 541 | 608 | 681
Individual assessment | ¥ 607 | ¥ 967 | 1,154
Purchased loans | Restatement Adjustment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 1,458
Accounting Standards Update 2016-13 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 31,745
Accounting Standards Update 2016-13 [Member] | Net investment in leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 3,550
Accounting Standards Update 2016-13 [Member] | Installment loans and net investment in leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 30,376
Accounting Standards Update 2016-13 [Member] | Other financial assets measured at amortized cost |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 1,369
Accounting Standards Update 2016-13 [Member] | Consumer | Real estate loans [Member] | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 2,856
Accounting Standards Update 2016-13 [Member] | Consumer | Real estate loans [Member] | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | (102)
Accounting Standards Update 2016-13 [Member] | Consumer | Card loans [Member] | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 12,146
Accounting Standards Update 2016-13 [Member] | Consumer | Other [Member] | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | (963)
Accounting Standards Update 2016-13 [Member] | Consumer | Other [Member] | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 563
Accounting Standards Update 2016-13 [Member] | Corporate | Non-recourse Loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 24
Accounting Standards Update 2016-13 [Member] | Corporate | Non-recourse Loans | The Americas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 1,577
Accounting Standards Update 2016-13 [Member] | Corporate | Corporate Real Estate Companies Loans | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 46
Accounting Standards Update 2016-13 [Member] | Corporate | Corporate Real Estate Companies Loans | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 1,579
Accounting Standards Update 2016-13 [Member] | Corporate | Corporate Commercial, industrial and other companies | Japan |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 98
Accounting Standards Update 2016-13 [Member] | Corporate | Corporate Commercial, industrial and other companies | Overseas |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | 9,002
Accounting Standards Update 2016-13 [Member] | Purchased loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  |  | ¥ 0

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