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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