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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
Mar. 31, 2025
Mar. 31, 2024
Yen-denominated insurance (First Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums - Undiscounted ¥ 1,551,749 ¥ 1,525,071
Expected future policy benefits and expenses - Undiscounted 2,532,638 2,378,836
Expected future gross premiums - Discounted 1,362,111 1,395,370
Expected future policy benefits and expenses - Discounted 1,511,436 1,565,877
Yen-denominated insurance (Third Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums - Undiscounted 2,456,942 2,590,963
Expected future policy benefits and expenses - Undiscounted 2,552,133 2,583,535
Expected future gross premiums - Discounted 2,003,392 2,242,701
Expected future policy benefits and expenses - Discounted 1,659,960 1,844,599
Foreign currency denominated insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums - Undiscounted 617,771 685,134
Expected future policy benefits and expenses - Undiscounted 1,288,727 1,300,018
Expected future gross premiums - Discounted 493,328 535,943
Expected future policy benefits and expenses - Discounted ¥ 442,939 ¥ 447,081