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Estimated Fair Value of Financial Instruments (Information about Carrying Amount of Financial Instruments Reported in Consolidated Balance Sheets and Related Market or Fair Value) (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Assets:      
Cash and cash equivalents ¥ 1,275,912 ¥ 1,206,573 ¥ 1,168,945
Restricted Cash 119,811 115,410 ¥ 134,675
Equity securities [1] 689,443 626,910  
Trading debt securities 834 0  
Available-for-sale debt securities 2,703,054 2,607,637  
Other Assets:      
Derivative assets 46,389 43,675  
Liabilities:      
Short-term debt 609,876 549,680  
Deposits 2,628,153 2,449,812  
Policy liabilities and Policy account balances (Investment contracts) 1,724,828 1,948,047  
Long-term debt 5,911,472 5,733,118  
Other Liabilities:      
Derivative liabilities ¥ 36,742 ¥ 35,543  
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities  
Level 1      
Assets:      
Cash and cash equivalents ¥ 1,275,912 ¥ 1,206,573  
Restricted Cash 119,811 115,410  
Installment loans (net of allowance for credit losses) 0 0  
Equity securities 127,195 [2] 137,014 [3]  
Trading debt securities 0    
Available-for-sale debt securities 8,917 12,243  
Other Assets:      
Time deposits 0 0  
Reinsurance recoverables (Investment contracts) 0 0  
Liabilities:      
Short-term debt 0 0  
Deposits 0 0  
Policy liabilities and Policy account balances (Investment contracts) 0 0  
Long-term debt 0 0  
Accounts payable (Contingent consideration) 0 0  
Level 2      
Assets:      
Cash and cash equivalents 0 0  
Restricted Cash 0 0  
Installment loans (net of allowance for credit losses) 47,109 42,940  
Equity securities 136,746 [2] 119,466 [3]  
Trading debt securities 834    
Available-for-sale debt securities 2,401,367 2,377,740  
Other Assets:      
Time deposits 5,367 1,400  
Reinsurance recoverables (Investment contracts) 0 0  
Liabilities:      
Short-term debt 609,876 549,680  
Deposits 2,465,832 2,279,207  
Policy liabilities and Policy account balances (Investment contracts) 0 0  
Long-term debt 1,829,434 1,705,485  
Accounts payable (Contingent consideration) 0 0  
Level 3      
Assets:      
Cash and cash equivalents 0 0  
Restricted Cash 0 0  
Installment loans (net of allowance for credit losses) 4,095,498 3,975,689  
Equity securities 183,037 [2] 162,210 [3]  
Trading debt securities 0    
Available-for-sale debt securities 292,770 217,654  
Other Assets:      
Time deposits 0 0  
Reinsurance recoverables (Investment contracts) 231,601 126,480  
Liabilities:      
Short-term debt 0 0  
Deposits 0 0  
Policy liabilities and Policy account balances (Investment contracts) 295,502 214,937  
Long-term debt 4,037,660 3,973,343  
Accounts payable (Contingent consideration) 18,168 15,259  
Carrying amount      
Assets:      
Cash and cash equivalents 1,275,912 1,206,573  
Restricted Cash 119,811 115,410  
Installment loans (net of allowance for credit losses) 4,168,801 4,043,271  
Equity securities 446,978 [2] 418,690 [3]  
Trading debt securities 834    
Available-for-sale debt securities 2,703,054 2,607,637  
Other Assets:      
Time deposits 5,367 1,400  
Derivative assets [4] 46,389 43,675  
Reinsurance recoverables (Investment contracts) 241,910 138,441  
Liabilities:      
Short-term debt 609,876 549,680  
Deposits 2,459,034 2,280,597  
Policy liabilities and Policy account balances (Investment contracts) 332,752 237,702  
Long-term debt 5,911,472 5,733,118  
Accounts payable (Contingent consideration) 18,168 15,259  
Other Liabilities:      
Derivative liabilities [4] 36,742 35,543  
Estimated fair value      
Assets:      
Cash and cash equivalents 1,275,912 1,206,573  
Restricted Cash 119,811 115,410  
Installment loans (net of allowance for credit losses) 4,142,607 4,018,629  
Equity securities 446,978 [2] 418,690 [3]  
Trading debt securities 834    
Available-for-sale debt securities 2,703,054 2,607,637  
Other Assets:      
Time deposits 5,367 1,400  
Derivative assets [4] 46,389 43,675  
Reinsurance recoverables (Investment contracts) 231,601 126,480  
Liabilities:      
Short-term debt 609,876 549,680  
Deposits 2,465,832 2,279,207  
Policy liabilities and Policy account balances (Investment contracts) 295,502 214,937  
Long-term debt 5,867,094 5,678,828  
Accounts payable (Contingent consideration) 18,168 15,259  
Other Liabilities:      
Derivative liabilities [4] ¥ 36,742 ¥ 35,543  
[1] The amount of assets under management of variable annuity and variable life insurance contracts included in equity securities were ¥132,313 million and ¥141,122 million as of March 31, 2025 and September 30, 2025, respectively. The amount of investment funds and others that elected the fair value option and were included in equity securities were ¥24,960 million and ¥24,488 million as of March 31, 2025 and September 30, 2025, respectively.
[2] The amount of ¥140,587 million of investment funds measured at net asset value per share is not included.
[3] The amount of ¥118,666 million of investment funds measured at net asset value per share is not included.
[4] It represents the amount after offset under counterparty netting of derivative assets and liabilities. For the information of input level before netting, see Note 3 “Fair Value Measurements.”