XML 114 R111.htm IDEA: XBRL DOCUMENT v3.25.3
Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Reconciliation of Liability For Future Policy Benefits (Detail) - JPY (¥)
¥ in Millions
 6 Months Ended 12 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Liability for Future Policy Benefit, Activity [Line Items]    
The liability for future policy benefits, after reinsurance recoverable ¥ 1,111,349 ¥ 1,424,312
Yen-denominated insurance (First Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Balance at beginning of year 855,431 873,038
Beginning balance at original discount rate 877,300 858,959
Effect of changes in cash flow assumptions 0 (9,660)
Effect of actual variances from expected experience 300 984
Adjusted beginning balance 877,600 850,283
Issuances 47,401 130,605
Interests 5,278 10,568
Net premium earned (55,184) (116,850)
Actual variances from cash flow assumptions (28) (437)
Derecognition 4,541 3,131
Effect of changes in foreign exchange rate 0 0
Ending balance at original discount rate 879,608 877,300
Effect of changes in discount rates (50,761) (21,869)
Ending balance 828,847 855,431
Balances at beginning of year 1,511,436 1,565,877
Beginning balance at original discount rate 1,750,912 1,658,143
Effect of changes in cash flow assumptions 0 (10,284)
Adjusted beginning balances 1,750,912 1,647,859
Issuances 47,401 130,605
Interests 12,567 24,463
Insurance claims paid (28,419) (57,099)
Actual variances from cash flow assumptions (6,523) (9,571)
Derecognition 11,387 14,655
Effect of changes in foreign exchange rate 0 0
Ending balance at original discount rate 1,787,325 1,750,912
Effect of changes in discount rates (503,309) (239,476)
Ending balance 1,284,016 1,511,436
Net liability for future policy benefits 455,169 656,005
Deferred profit liabilities 69,235 61,448
Subtotal 524,404 717,453
Less: Reinsurance recoverable 128 196
The liability for future policy benefits, after reinsurance recoverable 524,276 717,257
Yen-denominated insurance (Third Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Balance at beginning of year 1,162,214 1,306,719
Beginning balance at original discount rate 1,216,705 1,289,145
Effect of changes in cash flow assumptions 0 (7,648)
Effect of actual variances from expected experience 699 812
Adjusted beginning balance 1,217,404 1,282,309
Issuances 12,013 34,189
Interests 8,423 17,489
Net premium earned (56,025) (116,049)
Actual variances from cash flow assumptions (332) (770)
Derecognition 2,746 (463)
Effect of changes in foreign exchange rate 0 0
Ending balance at original discount rate 1,184,229 1,216,705
Effect of changes in discount rates (130,409) (54,491)
Ending balance 1,053,820 1,162,214
Balances at beginning of year 1,659,960 1,844,599
Beginning balance at original discount rate 1,878,075 1,895,730
Effect of changes in cash flow assumptions 0 (8,470)
Adjusted beginning balances 1,878,075 1,887,260
Issuances 12,013 34,189
Interests 13,967 27,997
Insurance claims paid (38,033) (72,044)
Actual variances from cash flow assumptions (2,953) (8,287)
Derecognition 8,007 8,960
Effect of changes in foreign exchange rate 0 0
Ending balance at original discount rate 1,871,076 1,878,075
Effect of changes in discount rates (490,118) (218,115)
Ending balance 1,380,958 1,659,960
Net liability for future policy benefits 327,138 497,746
Deferred profit liabilities 77,943 74,962
Subtotal 405,081 572,708
Less: Reinsurance recoverable 0 0
The liability for future policy benefits, after reinsurance recoverable 405,081 572,708
Foreign currency denominated insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Balance at beginning of year 345,932 389,664
Beginning balance at original discount rate 368,846 424,186
Effect of changes in cash flow assumptions 0 66
Effect of actual variances from expected experience (579) (3,193)
Adjusted beginning balance 368,267 421,059
Issuances 15,370 31,717
Interests 5,480 12,323
Net premium earned (33,271) (62,788)
Actual variances from cash flow assumptions (273) (1,231)
Derecognition (5,544) (27,567)
Effect of changes in foreign exchange rate (1,903) (4,667)
Ending balance at original discount rate 348,126 368,846
Effect of changes in discount rates (15,559) (22,914)
Ending balance 332,567 345,932
Balances at beginning of year 442,939 447,081
Beginning balance at original discount rate 650,005 659,217
Effect of changes in cash flow assumptions 0 81
Adjusted beginning balances 650,005 659,298
Issuances 15,370 31,717
Interests 9,471 19,385
Insurance claims paid (6,179) (18,634)
Actual variances from cash flow assumptions 3,180 13,086
Derecognition (10,108) (46,693)
Effect of changes in foreign exchange rate (2,571) (8,154)
Ending balance at original discount rate 659,168 650,005
Effect of changes in discount rates (188,604) (207,066)
Ending balance 470,564 442,939
Net liability for future policy benefits 137,997 97,007
Deferred profit liabilities 43,995 37,340
Subtotal 181,992 134,347
Less: Reinsurance recoverable 0 0
The liability for future policy benefits, after reinsurance recoverable ¥ 181,992 ¥ 134,347