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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

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