XML 116 R113.htm IDEA: XBRL DOCUMENT v3.25.3
Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted Before Reinsurance (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2025
Mar. 31, 2025
Yen-denominated insurance (First Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums - Undiscounted ¥ 1,574,161 ¥ 1,551,749
Expected future policy benefits and expenses - Undiscounted 2,614,139 2,532,638
Expected future gross premiums - Discounted 1,330,807 1,362,111
Expected future policy benefits and expenses - Discounted 1,284,016 1,511,436
Yen-denominated insurance (Third Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums - Undiscounted 2,398,826 2,456,942
Expected future policy benefits and expenses - Undiscounted 2,544,303 2,552,133
Expected future gross premiums - Discounted 1,819,478 2,003,392
Expected future policy benefits and expenses - Discounted 1,380,958 1,659,960
Foreign currency denominated insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums - Undiscounted 594,234 617,771
Expected future policy benefits and expenses - Undiscounted 1,309,972 1,288,727
Expected future gross premiums - Discounted 483,039 493,328
Expected future policy benefits and expenses - Discounted ¥ 470,564 ¥ 442,939