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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