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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
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Liability for Future Policy Benefit, Activity [Line Items]    
The liability for future policy benefits, after reinsurance recoverable ¥ 1,424,312 ¥ 1,430,462
Yen-denominated insurance (First Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Balance at beginning of year 873,038 894,537
Beginning balance at original discount rate 858,959 865,333
Effect of changes in cash flow assumptions (9,660) (6,213)
Effect of actual variances from expected experience 984 1,418
Adjusted beginning balance 850,283 860,538
Issuances 130,605 94,169
Interests 10,568 10,840
Net premium earned (116,850) (106,300)
Actual variances from cash flow assumptions (437) (550)
Derecognition 3,131 262
Effect of changes in foreign exchange rate 0 0
Ending balance at original discount rate 877,300 858,959
Effect of changes in discount rates (21,869) 14,079
Ending balance 855,431 873,038
Balances at beginning of year 1,565,877 1,571,886
Beginning balance at original discount rate 1,658,143 1,598,009
Effect of changes in cash flow assumptions (10,284) (7,962)
Adjusted beginning balances 1,647,859 1,590,047
Issuances 130,605 94,169
Interests 24,463 23,981
Insurance claims paid (57,099) (52,161)
Actual variances from cash flow assumptions (9,571) (11,644)
Derecognition 14,655 13,751
Effect of changes in foreign exchange rate 0 0
Ending balance at original discount rate 1,750,912 1,658,143
Effect of changes in discount rates (239,476) (92,266)
Ending balance 1,511,436 1,565,877
Net liability for future policy benefits 656,005 692,839
Deferred profit liabilities 61,448 47,068
Subtotal 717,453 739,907
Less: Reinsurance recoverable 196 211
The liability for future policy benefits, after reinsurance recoverable 717,257 739,696
Yen-denominated insurance (Third Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Balance at beginning of year 1,306,719 1,389,063
Beginning balance at original discount rate 1,289,145 1,338,398
Effect of changes in cash flow assumptions (7,648) 3,634
Effect of actual variances from expected experience 812 2,865
Adjusted beginning balance 1,282,309 1,344,897
Issuances 34,189 52,510
Interests 17,489 18,439
Net premium earned (116,049) (119,416)
Actual variances from cash flow assumptions (770) (862)
Derecognition (463) (6,423)
Effect of changes in foreign exchange rate 0 0
Ending balance at original discount rate 1,216,705 1,289,145
Effect of changes in discount rates (54,491) 17,574
Ending balance 1,162,214 1,306,719
Balances at beginning of year 1,844,599 1,918,462
Beginning balance at original discount rate 1,895,730 1,887,744
Effect of changes in cash flow assumptions (8,470) 4,600
Adjusted beginning balances 1,887,260 1,892,344
Issuances 34,189 52,510
Interests 27,997 28,159
Insurance claims paid (72,044) (70,513)
Actual variances from cash flow assumptions (8,287) (7,465)
Derecognition 8,960 695
Effect of changes in foreign exchange rate 0 0
Ending balance at original discount rate 1,878,075 1,895,730
Effect of changes in discount rates (218,115) (51,131)
Ending balance 1,659,960 1,844,599
Net liability for future policy benefits 497,746 537,880
Deferred profit liabilities 74,962 68,539
Subtotal 572,708 606,419
Less: Reinsurance recoverable 0 0
The liability for future policy benefits, after reinsurance recoverable 572,708 606,419
Foreign currency denominated insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Balance at beginning of year 389,664 374,951
Beginning balance at original discount rate 424,186 409,847
Effect of changes in cash flow assumptions 66 2,106
Effect of actual variances from expected experience (3,193) (2,531)
Adjusted beginning balance 421,059 409,422
Issuances 31,717 43,378
Interests 12,323 12,405
Net premium earned (62,788) (61,594)
Actual variances from cash flow assumptions (1,231) (1,222)
Derecognition (27,567) (32,681)
Effect of changes in foreign exchange rate (4,667) 54,478
Ending balance at original discount rate 368,846 424,186
Effect of changes in discount rates (22,914) (34,522)
Ending balance 345,932 389,664
Balances at beginning of year 447,081 387,073
Beginning balance at original discount rate 659,217 573,616
Effect of changes in cash flow assumptions 81 1,782
Adjusted beginning balances 659,298 575,398
Issuances 31,717 43,378
Interests 19,385 17,649
Insurance claims paid (18,634) (17,757)
Actual variances from cash flow assumptions 13,086 11,794
Derecognition (46,693) (49,973)
Effect of changes in foreign exchange rate (8,154) 78,728
Ending balance at original discount rate 650,005 659,217
Effect of changes in discount rates (207,066) (212,136)
Ending balance 442,939 447,081
Net liability for future policy benefits 97,007 57,417
Deferred profit liabilities 37,340 26,930
Subtotal 134,347 84,347
Less: Reinsurance recoverable 0 0
The liability for future policy benefits, after reinsurance recoverable ¥ 134,347 ¥ 84,347