v3.26.3
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
Sep. 30, 2026
Mar. 31, 2026
Liability for Future Policy Benefit, Activity [Line Items]    
Subtotal ¥ 1,265,430 ¥ 1,277,462
Policy account balances for single-payment whole life insurance 337,149 304,541
Fixed annuities and annuitization benefits 92,384 101,782
Policy account balances for variable annuity and variable life insurance contracts and market risk benefits 145,670 138,027
Others [1] 113,223 121,898
Total 1,953,856 1,943,710
Yen-denominated insurance (First Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Subtotal 636,726 641,078
Yen-denominated insurance (Third Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Subtotal 397,013 411,992
Foreign currency denominated insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Subtotal ¥ 231,691 ¥ 224,392
[1] Others include unearned premiums and liabilities for unpaid claims.