v3.26.1
Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Non-Accrual of Financial Assets (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance ¥ 99,038 ¥ 58,756
Ending balance 98,188 99,038
Interest income recognized during the reporting period 306 345
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 2,861 2,975
Consumer borrowers | Real estate loans | Japan    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 1,235 1,095
Ending balance 1,050 1,235
Interest income recognized during the reporting period 281 260
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 322 128
Consumer borrowers | Real estate loans | Overseas    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 4,976 1,107
Ending balance 8,895 4,976
Interest income recognized during the reporting period 0 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 137 0
Consumer borrowers | Other | Japan    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 86 96
Ending balance 0 86
Interest income recognized during the reporting period 0 1
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 0 0
Consumer borrowers | Other | Overseas    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 2,373 2,574
Ending balance 982 2,373
Interest income recognized during the reporting period 0 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 3 4
Corporate borrowers | Non-recourse Loans | Overseas    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 3,831  
Ending balance 11,477 3,831
Interest income recognized during the reporting period 0  
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 0  
Corporate borrowers | Non-recourse Loans | The Americas    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 3,831 3,116
Ending balance   3,831
Interest income recognized during the reporting period   0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income   603
Corporate borrowers | Other than non-recourse loans | Real estate companies | Japan    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 29 115
Ending balance 0 29
Interest income recognized during the reporting period 22 30
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 0 0
Corporate borrowers | Other than non-recourse loans | Real estate companies | Overseas    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 3,417 1,731
Ending balance 2,181 3,417
Interest income recognized during the reporting period 0 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 0 0
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Japan    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 520 355
Ending balance 541 520
Interest income recognized during the reporting period 3 54
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 0 37
Corporate borrowers | Other than non-recourse loans | Commercial, industrial and other companies | Overseas    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 60,629 27,636
Ending balance 46,642 60,629
Interest income recognized during the reporting period 0 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 2,399 2,203
Loans to Equity Method Investees    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 1,345 1,929
Ending balance 0 1,345
Interest income recognized during the reporting period 0 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income 0 0
Net investment in leases    
Disclosure Detail Of Non Accrual Of Financial Assets [Line Items]    
Beginning balance 20,597 19,002
Ending balance 26,420 20,597
Interest income recognized during the reporting period 0 0
Balance not associated allowance for credit losses among financial assets measured at amortized cost, which is suspending recognition of income ¥ 0 ¥ 0