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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
Sep. 30, 2023
Mar. 31, 2023
Yen-denominated insurance (First Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums - Undiscounted ¥ 1,522,501 ¥ 1,538,107
Expected future policy benefits and expenses - Undiscounted 2,316,478 2,291,205
Expected future gross premiums - Discounted 1,389,250 1,429,503
Expected future policy benefits and expenses - Discounted 1,525,033 1,571,887
Yen-denominated insurance (Third Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums - Undiscounted 2,649,324 2,695,239
Expected future policy benefits and expenses - Undiscounted 2,582,806 2,578,630
Expected future gross premiums - Discounted 2,287,047 2,388,386
Expected future policy benefits and expenses - Discounted 1,839,144 1,918,462
Foreign currency denominated insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums - Undiscounted 687,445 626,411
Expected future policy benefits and expenses - Undiscounted 1,262,953 1,097,567
Expected future gross premiums - Discounted 519,357 492,588
Expected future policy benefits and expenses - Discounted ¥ 396,985 ¥ 387,073