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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
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance ¥ 56,769 ¥ 58,110  
Provision (Reversal) 7,567 5,580  
Allowance of purchased loans during the reporting period 3,633 597  
Charge-offs (8,471) (6,620)  
Recoveries 443 369  
Other (951) (4,280)  
Ending balance 58,990 53,756  
Collective (pool) assessment 33,735 32,517 ¥ 32,890
Individual assessment 25,255 21,239 23,879
Consumer | Real estate loans | Japan      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,891 3,203  
Provision (Reversal) 93 68  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs (31) (44)  
Recoveries 40 35  
Other (275) 1  
Ending balance 2,718 3,263  
Collective (pool) assessment 2,675 2,972 2,609
Individual assessment 43 291 282
Consumer | Real estate loans | Overseas      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 1,679 581  
Provision (Reversal) (95) 359  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs (78) 0  
Recoveries 0 0  
Other 47 (49)  
Ending balance 1,553 891  
Collective (pool) assessment 494 432 505
Individual assessment 1,059 459 1,174
Consumer | Card loans | Japan      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 36 12  
Provision (Reversal) (5) (8)  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs 0 0  
Recoveries 4 7  
Other 0 1  
Ending balance 35 12  
Collective (pool) assessment 35 12 36
Individual assessment 0 0 0
Consumer | Other | Japan      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 90 91  
Provision (Reversal) (4) (2)  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs 0 0  
Recoveries 2 4  
Other (84) (2)  
Ending balance 4 91  
Collective (pool) assessment 4 6 6
Individual assessment 0 85 84
Consumer | Other | Overseas      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 3,048 3,060  
Provision (Reversal) 1,146 1,815  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs (1,286) (2,131)  
Recoveries 184 223  
Other (16) (121)  
Ending balance 3,076 2,846  
Collective (pool) assessment 1,295 1,457 1,355
Individual assessment 1,781 1,389 1,693
Corporate | Non-recourse Loans | Japan      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 462 429  
Provision (Reversal) 100 156  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs 0 0  
Recoveries 0 0  
Other (6) 0  
Ending balance 556 585  
Collective (pool) assessment 556 585 462
Individual assessment 0 0 0
Corporate | Non-recourse Loans | Overseas      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,593    
Provision (Reversal) 2,022    
Allowance of purchased loans during the reporting period 0    
Charge-offs 0    
Recoveries 0    
Other 1,029    
Ending balance 5,644    
Collective (pool) assessment 2,598    
Individual assessment 3,046    
Corporate | Non-recourse Loans | The Americas      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,593 1,718  
Provision (Reversal)   445  
Allowance of purchased loans during the reporting period   0  
Charge-offs   0  
Recoveries   0  
Other   (127)  
Ending balance   2,036  
Collective (pool) assessment   1,038 1,548
Individual assessment   998 1,045
Corporate | Other than non-recourse loans | Real estate companies | Japan      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 908 975  
Provision (Reversal) 58 58  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs 0 0  
Recoveries 13 13  
Other 0 (2)  
Ending balance 979 1,044  
Collective (pool) assessment 953 961 877
Individual assessment 26 83 31
Corporate | Other than non-recourse loans | Real estate companies | Overseas      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,046 1,549  
Provision (Reversal) 178 361  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs 0 0  
Recoveries 0 0  
Other (967) (130)  
Ending balance 1,257 1,780  
Collective (pool) assessment 715 626 764
Individual assessment 542 1,154 1,282
Corporate | Other than non-recourse loans | Commercial, industrial and other companies loans | Japan      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 1,078 857  
Provision (Reversal) (13) 496  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs 0 (125)  
Recoveries 4 16  
Other (41) 0  
Ending balance 1,028 1,244  
Collective (pool) assessment 534 773 586
Individual assessment 494 471 492
Corporate | Other than non-recourse loans | Commercial, industrial and other companies loans | Overseas      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 20,063 25,824  
Provision (Reversal) 2,571 (1,509)  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs (1,992) (2,433)  
Recoveries 59 24  
Other 24 (3,507)  
Ending balance 20,725 18,399  
Collective (pool) assessment 12,006 11,492 11,919
Individual assessment 8,719 6,907 8,144
Loans to Equity Method Investees      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 1,512 878  
Provision (Reversal) 19 1,410  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs 0 (37)  
Recoveries 0 0  
Other (5) (173)  
Ending balance 1,526 2,078  
Collective (pool) assessment 186 420 167
Individual assessment 1,340 1,658 1,345
Purchased loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 1,342 1,133  
Provision (Reversal) 7 7  
Allowance of purchased loans during the reporting period 3,633 597  
Charge-offs (3,659) (608)  
Recoveries 0 1  
Other (984) (10)  
Ending balance 339 1,120  
Collective (pool) assessment 133 530 521
Individual assessment 206 590 821
Net investment in leases      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 18,122 16,780  
Provision (Reversal) 1,426 1,833  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs (1,344) (1,120)  
Recoveries 137 37  
Other 321 (131)  
Ending balance 18,662 17,399  
Collective (pool) assessment 11,254 10,945 11,236
Individual assessment 7,408 6,454 6,886
Installment loans and net investment in leases      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 55,870 57,090  
Provision (Reversal) 7,503 5,489  
Allowance of purchased loans during the reporting period 3,633 597  
Charge-offs (8,390) (6,498)  
Recoveries 443 360  
Other (957) (4,250)  
Ending balance 58,102 52,788  
Collective (pool) assessment 33,438 32,249 32,591
Individual assessment 24,664 20,539 23,279
Other financial assets measured at amortized cost      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 899 1,020  
Provision (Reversal) 64 91  
Allowance of purchased loans during the reporting period 0 0  
Charge-offs (81) (122)  
Recoveries 0 9  
Other 6 (30)  
Ending balance 888 968  
Collective (pool) assessment 297 268 299
Individual assessment ¥ 591 ¥ 700 ¥ 600