v3.26.1
Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Policy Liabilities And Policy Account Balances In Statement of Financial Position (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Liability for Future Policy Benefit, Activity [Line Items]    
Subtotal ¥ 1,277,462 ¥ 1,424,312
Policy account balances for single-payment whole life insurance 304,541 134,572
Fixed annuities and annuitization benefits 101,782 119,093
Policy account balances for variable annuity and variable life insurance contracts and market risk benefits 138,027 136,257
Others [1] 121,898 133,813
Total 1,943,710 1,948,047
Yen-denominated insurance (First Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Subtotal 641,078 717,257
Yen-denominated insurance (Third Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Subtotal 411,992 572,708
Foreign currency denominated insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Subtotal ¥ 224,392 ¥ 134,347
[1] Others include unearned premiums and liabilities for unpaid claims.